gaia.asu.sp.esm.00012 issue 1 - european space...

Gaia

GAIA.ASU.SP.ESM.00012 Issue 1

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Document Autogenerated from DOORS Module : /GAIA Prime/Level 4/4_20 EIU RS/Gaia-EIU GAIA.ASU.SP.ESM.00012 Issue 1.doc

GAIA EIU Requirement Specification

CI CODE: 13120 DRL Refs :

UK EXPORT CONTROL RATING : Not Listed

Rated By : D.Perkins

Prepared by: Date:

Baljit Matharu

Checked by: Date:

Andy Dyne

Approved by: Date:

Steve King / David Perkins

Authorised by: Date:

Rod Emery

This document is produced under ESA contract, ESA export exemptions may therefore apply. These Technologies may require an export licence if exported from the EU

© EADS Astrium Limited 2006

EADS Astrium Ltd owns the copyright of this document which is supplied in confidence and which shall not be used for any purpose other than that for which it is supplied and shall not in whole or in part be reproduced, copied, or

communicated to any person without written permission from the owner.

EADS Astrium Limited, Registered in England and Wales No. 2449259 Registered Office: Gunnels Wood Road, Stevenage, Hertfordshire, SG1 2AS, England

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EADS Astrium Ltd owns the copyright of this document which is supplied in confidence and which shall not be used for any purpose other than that for which it is supplied and shall not in whole or in part be reproduced, copied, or communicated to any person without written permission from the owner.

GAIA.ASU.SP.ESM.00012 Issue 1.doc

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CONTENTS 1 Introduction and Scope ..............................................................................................................................6

1.1 Introduction..........................................................................................................................................6 1.2 Scope ..................................................................................................................................................7 1.3 Summary Description..........................................................................................................................8

2 Documents .................................................................................................................................................9 2.1 Applicable Documents ........................................................................................................................9 2.2 Standards............................................................................................................................................9

3 EIU Functional and Performance Requirements......................................................................................10 3.1 EIU Definition ....................................................................................................................................10 3.2 Functions and Performance ..............................................................................................................12

3.2.1 General ......................................................................................................................................12 3.2.2 DC/DC Converters .....................................................................................................................12

3.3 EIU Modes.........................................................................................................................................12 3.3.1 General ......................................................................................................................................12 3.3.2 Off Mode ....................................................................................................................................12 3.3.3 Nominal Mode............................................................................................................................13

3.4 Electrical Design and Interface Requirements..................................................................................13 3.4.1 Primary Power Interface and Power Consumption....................................................................13 3.4.2 Analogue TM Acquisition ...........................................................................................................14 3.4.3 Relay Status Acquisition ............................................................................................................16 3.4.4 Bi-Level Digital Telemetry Acquisition .......................................................................................17 3.4.5 CPS............................................................................................................................................17 3.4.6 Command, Monitoring and Synchronisation Interfaces.............................................................22

3.5 EIU Operational Requirements .........................................................................................................25 3.5.1 Observability Requirements.......................................................................................................25 3.5.2 Commandability .........................................................................................................................25

4 EIU Specific Design and Interface Requirements ....................................................................................26 4.1 Mechanical Design and Interface Requirements ..............................................................................26

4.1.1 Mass...........................................................................................................................................26 4.1.2 Centre of Gravity........................................................................................................................26 4.1.3 Envelope ....................................................................................................................................26

4.2 Thermal Design and Interface Requirements ...................................................................................26 4.2.1 Heat Dissipation.........................................................................................................................26 4.2.2 EIU Thermal Properties .............................................................................................................26 4.2.3 Temperature Limits ....................................................................................................................27

4.3 Fine Sun Sensor ...............................................................................................................................27 4.3.1 EIU Fine Sun Sensor Interface ..................................................................................................27 4.3.2 FSS Power Supply.....................................................................................................................29 4.3.3 FSS Outputs ..............................................................................................................................30

5 General Design and Interface Requirements...........................................................................................31 5.1 GDIR Applicability .............................................................................................................................31 5.2 EIU RAM Specific Requirements ......................................................................................................31

5.2.1 Reliability....................................................................................................................................31 5.2.2 Availability ..................................................................................................................................31 5.2.3 Maintainability ............................................................................................................................31 5.2.4 EIU Fault Tolerance Requirements ...........................................................................................31

5.3 Identification & Marking.....................................................................................................................32 6 Product Assurance Requirements ...........................................................................................................33 7 VERIFICATION REQUIREMENTS ..........................................................................................................34

7.1 Required Analyses ............................................................................................................................34 7.2 Required EIU Level Tests .................................................................................................................34

7.2.1 Functional/ Performance Tests..................................................................................................34 8 GDIR Applicability Matrix..........................................................................................................................35 9 Abbreviations List .....................................................................................................................................68

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TABLES Error! No table of figures entries found.

FIGURES Figure 1.1-1: Gaia Satellite Configuration ........................................................................................................6 Figure 1.3-1: EIU Functional Overview..............................................................................................................8 Figure 3.1-1: GAIA EIU typical Electrical Architecture.............................................................................10 Figure 3.4-1: EIU Power Distribution...............................................................................................................14 Figure 3.4-2: Latch Valve / Flow Control Valve driver Architecture.................................................................18 Figure 4.2-1: Unit Thermal Environment .........................................................................................................27 Figure 4.3-1: Fine Sun Sensor Timing Diagram..............................................................................................29

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1 INTRODUCTION AND SCOPE

1.1 Introduction

This document specifies the requirements for the Equipment Interface Unit (EIU) on-board the Gaia satellite.

The Gaia satellite is ESA cornerstone mission to conduct a census of up to 1 billion stars in our galaxy. Figure 1.1-1 shows the configuration.

Xs, Xp, Xa

ASTRO LOS 2

ASTRO LOS 1

Za

Zs

Zp

Yp

Ya

Ys

Fixed SolarArray Panels

Equipped PhaseArray Antenna Panel

Propulsion Ring

Propellant &Pressurant Tanks

Equipped ServiceModule Structure

Payload ModuleOptical Bench

Payload ModuleFocal Plane Assembly

Deployable SolarPanels

DSA Interface Ring

DeployableSunshield Assembly

Thermal Tent

Launch Lock Bipods (amber)In-Orbit Bipods (grey)

Figure 1.1-1: Gaia Satellite Configuration

The general requirements for the Gaia missions are:

• a continuously scanning instrument capable of measuring simultaneously the angular separation of thousands of star images as they pass across a field of view of about one degree diameter.

• Multi-color photometry of all astrometric targets is a necessary and integral part of the concept.

• high angular resolution in the scanning direction is provided by the monolithic mirror of dimension of approximately 1.5m.

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• the wide-angle measuring capability is provided by two viewing directions at large angles to each other and scanning the same great circle on the sky.

• The whole sky is systematically scanned in such a manner that observations extending over several years permit a complete separation of the astrometric parameters describing the motions and distances of the stars.

The GAIA mission will rely on the proven principals of ESA's Hipparcos mission to solve one of the most difficult yet deeply fundamental challenges in modern astronomy: to create an extraordinarily precise three-dimensional map of about one billion stars throughout our Galaxy and beyond. In the process, it will map their motions, which encode the origin and subsequent evolution of the Galaxy. Through comprehensive photometric classification, it will provide the detailed physical properties of each star observed: characterizing their luminosity, temperature, gravity, and elemental composition. This massive stellar census will provide the basic observational data to tackle an enormous range of important problems related to the origin, structure, and evolutionary history of our Galaxy.

1.2 Scope

The document in hand comprises the contractually relevant technical requirements and constraints for the Gaia EIU. This includes:

• the performance as well as design and interface requirements of the EIU hardware.

• the testing and verification requirements

• the product assurance requirements

The document implements the following structure:

Chapter 2: List of Applicable Documents and Standards

Chapter 3: EIU Functional and Performance Requirements

Chapter 4: EIU Specific Design and Interface Requirements

Chapter 5: General Design and Interface Requirements (GDIR Applicability)

Chapter 6: Product Assurance Requirements

Chapter 7: EIU Verification Requirements

Requirements within this document are shown in an italic font. Each requirement is proceeded by a summary line that contains the following fields, delimited by "/".

· <Doors Requirement Number>EIU-xyz. This is a unique number, assigned consecutively

· <Created From> Shows parent requirement

· <Test Method> T= Test, A = Analysis, I = Inspection, R = Review of Design, D = Definition

If tables are considered as part of a requirement they are referenced clearly in the text and inserted after and separated from the requirement table and are managed as free text attached to the identifier requirement.

The trace to the upper level requirements (Upper Links), shall be managed using the following format:

· AAA-NNNN where AAA is a label associated to the upper document and NNNN the requirement identifier of this upper level.

· Or CREATED key word if the requirement has no link with upper level

(This information is only relevant for verification tracing to be performed by Astrium and consequently may be ignored by the contractor.)

All elements of the document, which are not presented in the format explained above are not requirements and will not be verified or tracked.

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1.3 Summary Description

The Gaia Electrical Interface Unit (EIU) provides interfaces and acquisition sequencing via a SpaceWire controller for thermistors, Flow control valves, latching valves, analogue to digital acquisitions, Pressure transducers, Fine Sun Sensor (FSS), Spacecraft Radiation Environmental Monitor (SREM), Standard Power commands and Bi-level inputs and acquires telemetry. The communication bus is based on the industry standard SpaceWire protocol with a LVDS physical layer.

A Functional Overview showing the main building blocks of the EIU is given in the figure below.

SpWController

SHP

CPSLV, FCV

MPS

EIU

DC/DC

FSS PWR +

BLTM

ANALOGTM

CPS

ON/OFF

SPACEWIRE

28V

FSS

SREM

12 BitADC

MUX

MPE

DC/DC

DC/DC

DC/DC

Address

± 14V

SpWController

SHP

CPSLV, FCV

MPS

EIU

DC/DC

FSS PWR +

BLTM

ANALOGTM

CPS

ON/OFF

SPACEWIRE

28V

FSS

SREM

12 BitADC

MUX

MPE

SpWController

SHP

CPSLV, FCV

MPS

EIU

DC/DC

FSS PWR +

BLTM

ANALOGTM

CPS

ON/OFF

SPACEWIRE

28V

FSS

SREM

12 BitADC

MUX

MPE

DC/DC

DC/DC

DC/DC

Address

± 14V

Figure 1.3-1: EIU Functional Overview

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2 DOCUMENTS

2.1 Applicable Documents

The following publications form a part of this document to the extent specified herein. Unless an issue is quoted for a document, the current issue is deemed to apply. When an issue is quoted, that issue and no other must be used.

[AD 1] GAIA.ASD.SP.SAT.00007 Finite Element Modelling Requirement

[AD 2] GAIA.ASF.SP.SAT.0002 General Design and Interface Requirements Specification (GDIR)

[AD 3] GAIA.ASF.SP.SAT.00029 Software PA Requirements for Subcontractors

[AD 4] GAIA.ASD.SP.SAT.00008 Thermal Modelling Requirement.

[AD 5]

[AD 6]

GAIA.ASF.SP.SAT.00004

SREM-DI-CSAG-03 Iss1 rev 5

Product Assurance Requirements for Sub Contractor

SREM ICD

2.2 Standards

[SD 1] ECSS-E-50-12A SpaceWire Specification

[SD 2] ECSS-E-40 B Space Engineering Software

[SD 3]

[SD 4]

ECSS-Q-80 B

TIA/EIA-646-A

Software Product Assurance

Low Voltage Differential Signalling Specification

Further standards as defined by the SOW [AD 1].

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3 EIU FUNCTIONAL AND PERFORMANCE REQUIREMENTS

3.1 EIU Definition

The EIU is embedded in the platform electrical architecture as depicted in Figure 3.1-1.

Note: The Gaia Block diagram is for information only.

SpW Controller TMTC A

SpW Controller

TMTC B

AN TM BLD TM RSA TM SHP FCV / LV

THRUSTERS FSS , SREM

Link to CDMU

Link to CDMU

28V (N)

28V(R)

28V (N)

28V(R)

Figure 3.1-1: GAIA EIU typical Electrical Architecture

EIU-137/ERS_164/T,A,R

The EIU shall monitor the operational and health status of it's functions and resources, and provide to the CDMU when requested, status information to trigger appropriate corrective actions at FDIR level in case of failure detection. This request will be in the form of a normal TM acquisition.


The EIU shall acquire TM data via a serial bus from the SREM.

EIU-139/CREATED/T,A,R

The EIU shall provide analogue input circuitry and address lines to interface with the FSS.

EIU-140/ERS_460,ERS_64/T,A,R

The EIU shall provide a dedicated dual redundant SpaceWire Interface with the CDMU.


The EIU shall contain a central function typically to store and decode SpaceWire commands, provide timings and sequences for valves, EIU housekeeping TM, acquire and compile TM parameters as requested by the CDMU.

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EIU-3415/CREATED/T,A

The EIU shall function with upto 1000 cmd/s


The EIU shall read all TM parameters within 1 second.


The EIU shall function with up to 6400 TM reads per second


The EIU shall be able to accept and execute further commands whilst previous commands are being processed. In case of conflict between timings FCV timing shall have the highest priority. A command should not be lost due to an FCV command, but only delayed.

EIU-154/ERS_369/T,A

The EIU power shall be directly derived from the LCL with a 28V regulated power supply. There shall be no internal switches in series with the power rail prior to input of any DC/DC converters.


The LCL's can be applied in any order and any combination without stress or inadvertent activation of a function.


Any failure in any I/O function shall not propagate to any other EIU function.


No spurious commands shall be generated at power-on, power-off or due to a failure inside the power resources or due to a SpaceWire controller reset.

EIU-662/CREATED/A,R

No failure propagation to the primary power supply shall occur for any single power failure.

EIU-131/ERS_45,MODIFIED,/T,A,R

The EIU (Electrical Interface Unit) shall contain the following functional elements/ services/interfaces:

• SpaceWire interface

• Controller or sequencer electronics

(the above two blocks form the function 'SpaceWire Controller' used in this specification)

• Fine Sun Sensor (FSS) interface

• CPS interface

• Thermistor acquisition functions

• SHP/EHP commands

• Analogue acquisition functions

• Bilevel TM interface

• Pressure transducer TM interface.

• RS422 interface for SREM (tbd)

• Relay/Switch Status Acquisition (RSA)

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EIU-3385/ERS_737/T,A

Any IO shall be accessible from any of the TMTC interface board meaning that it shall be possible to select a configuration with all I/O boards switched on at the same time.

3.2 Functions and Performance

3.2.1 General

EIU-169/ERS_737/T,A

Each EIU SpaceWire controller shall be able to access any of the EIU I/O functions.


Each SpaceWire controller shall have dedicated SHP commands to enable it to be switched ON and OFF individually.


It shall be possible for both SpaceWire controllers to be on simultaneously, the EIU shall be able to function correctly under this condition

3.2.2 DC/DC Converters

EIU-174/CREATED/T,R

The EIU switch-on and switch-off primary voltage thresholds and timing shall be defined and agreed via the ICD.


The switching of the EIU internal power resources shall be internally controlled by the EIU after receipt of a SpaceWire command.


The EIU is classed as an essential load, it shall function down to the minimum bus voltage as defined in Section 8


The following I/O functions shall be enabled or disabled on command:

• CPS ON/OFF

• SHP ON/OFF

Note: This does not preclude the provision of additional isolation switching in other functions to prevent failure propagation

3.3 EIU Modes

3.3.1 General

EIU-519/CREATED/T,R

The EIU shall provide the following operational modes:

• Off Mode

• Nominal Mode

3.3.2 Off Mode


The EIU Off Mode is defined by the following characteristics:

• No power is applied to the EIU primary power inputs

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3.3.3 Nominal Mode

EIU-524/CREATED/T,A

The EIU shall enter the Nominal Mode upon:

• connection of primary power via LCL to the corresponding primary power inputs of the EIU.

Initial state shall be for SpaceWire interface controller 1, Side A active and side B inactive


Each EIU function, once powered, and after completion of it's initialisation and self-test sequence, shall be fully operational within 2 seconds(tbc). The self test report is to be agreed with the customer

EIU-3412/ERS_987/T,A

Each EIU function shall be able to interface with the Central software to address all acquisitions and commands at a nominal 8 Hz frequency. This shall be considered to verify the traffic load capability on the CDMU-EIU interface.


In the normal mode, the EIU shall be able to fulfil all the functions defined in this specification

EIU-3374/CREATED/R

The EIU shall provide the following mode of data acquisitions:-

• Direct Mode


Direct Mode

The EIU shall run an elementary acquisition cycle of 32 channels and present the date back to the SpaceWire controller, within 5 ms after loading of the corresponding acquisition table from the CDMU.

EIU-3376/ERS_988 MODIFIED/T,A

The EIU shall be able to accept repeat acquisition commands in a single 8Hz cycle.

3.4 Electrical Design and Interface Requirements

3.4.1 Primary Power Interface and Power Consumption


The EIU shall accept to be supplied power according to the Figure 3.4-1, with a regulated primary power via

• one Latching Current Limiters (LCL , 1A, class A) for the nominal functions

• one Latching Current Limiters (LCL , 3A, class C) for the Thruster power

with the electrical characteristics according to Section 8.

The generation of all secondary voltages shall be performed within the EIU.

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LCL

nom

ON/OFF

LCL

redundant

PCDU

NomEIU

RedEIU

nom

ON/OFF

NomThruster

DriveElectronics

redunadant

RedThruster

DriveElectronics

LCL

LCL

Thrusters

Thrusters

SHP

SHP

Figure 3.4-1: EIU Power Distribution


It shall be possible to switch on both Nominal and Redundant functions within the EIU, for diagnostic purposes, without affecting any nominal performance.

EIU-553/CREATED/A,R

No failure propagation to the primary power bus shall occur for any single DC/DC converter failure .

3.4.2 Analogue TM Acquisition

3.4.2.1 General

EIU-572/GDI-1215,GDI-487,GDI-1216,GDI-2136/T,A

The EIU analogue acquisition function shall provide at least the following interfaces:

• Monitoring/Control Thermistor (type YSI-44907) or Fenwell 15K acquisition interfaces

• Monitoring Thermistors (PT-200)

• Control Thermistors (PT-1000)

• Analogue voltage (0 to 5V)

• Analogue voltage (-5V to 5V)

• Analogue Voltage (+10V to -10V)

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EIU-573/CREATED/T,A

Each Analogue Acquisition function, once powered, shall provide its specified interface capabilities under control of the active controller.

EIU-576/CREATED/T,A

The Analogue Acquisition function shall be able to provide the active controller with acquisition data of a specific input (individual or group of inputs) further to a request received.


For acquisition of standard temperature values, the EIU shall be able to directly interface with the thermistors. For that purpose the thermistors shall be powered by the EIU and the resulting voltage shall be used to feed a dedicated analogue channel.


Analogue acquisition interfaces are used for the acquisition by the EIU of information from users in the form of a voltage varying between two defined limits. This voltage shall be sampled on a regular basis, with an acquisition time of 128 uS, a noise content of <4mv and with an accuracy of 0.8%, converted from analogue to digital and coded as a 12 bit word.

The detailed telemetry architecture implementation is open to the supplier, as long as all the detailed requirements are met

3.4.2.2 Thermistor Types

3.4.2.2.1 Type ANY

EIU-578/GDI-1215,ERS_613,ERS_615,ERS_509,ERS_614,ERS_585/T,A

The EIU thermistor acquisition function shall provide 224 (TBC) thermistor acquisition interfaces for the thermal control function with the electrical characteristics in accordance with Section 8, (YSI-44907 Interface Data Sheet "ANY")

These acquisitions are used for thermal control/monitoring and also for unit monitoring.

EIU-581/CREATED/A,R

No single failure shall lead to the loss of more than 32(TBC) thermistor acquisitions in either the nominal or the redundant blocks and shall not propagate to any other function.


All acquisition interfaces shall be accessible from either SpaceWire controllers

3.4.2.2.2 Type ANP

EIU-579/GDI-487/T,A,R

The EIU shall provide 40 (TBC) thermistor acquisition interfaces for the thermal monitoring functions with the electrical characteristics in accordance with Section 8, (PT1000 Interface Data Sheet "ANP")

EIU-580/CREATED/A,R

No single failure shall lead to the loss of more than 4 (TBC) thermistor acquisitions in either the nominal or the redundant blocks and shall not propagate to any other function.



3.4.2.2.3 Type ANT

EIU-582/GDI-2136/T,A

The EIU shall provide 32 (tbc) thermistor acquisition interfaces for the Thruster Chamber monitoring function with the electrical characteristics in accordance with Section 8, (PT200 Interface Data Sheet "ANT)

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EIU-585/CREATED/A,R

No single failure shall lead to the loss of more than 4 (TBC) thermistor acquisitions in either the nominal or the redundant blocks and shall not propagate to any other function.



3.4.2.3 ANTM Acquisition (0V to +5V)

EIU-809/CREATED/T,R

The EIU shall provide 96 (tbc) Analogue Telemetry Acquisition (0V to +5V) interfaces.

EIU-810/GDI-1210/T,A

The EIU shall provide each Analogue Telemetry Acquisition (0V to +5V) interface with the electrical characteristics according with Section 8, Analogue Telemetry Acquisition (Interface Data Sheet "AN2"; Receiver: EIU).

EIU-811/CREATED/A,R

The failure propagation of a single failure in the Analogue Telemetry Acquisition (0V to +5V) interface shall be limited to the loss of 8 (TBC) Analogue Telemetry Acquisition (0V to +5V) Interfaces.


Fault voltages shall be verified by WCA



3.4.2.4 ANTM Acquisition (-5V to +5V)

EIU-804/CREATED/T,R

The EIU shall provide 32(tbc) Analogue Telemetry Acquisition (-5V to +5V) interfaces.

EIU-805/GDI-1205/T,R

The EIU shall provide each Analogue Telemetry Acquisition (-5V to +5V) interface with the electrical characteristics according with Section 8, Analogue Telemetry Acquisition (Interface Data Sheet "AN1"; Receiver: EIU).

EIU-806/CREATED/A,R

The failure propagation of a single failure in the Analogue Telemetry Acquisition interface shall be limited to the loss of 4 (TBC)Analogue TM Acquisition (-5V to +5V) interfaces.





3.4.3 Relay Status Acquisition

EIU-780/ERS_524,/T,R

The EIU shall provide 128 (tbc) Relay Status Acquisition Interfaces. These RSA interfaces shall be accessible by the by the CDMU CSW.

EIU-782/GDI-514/T,R

The EIU shall provide each Relay Status Acquisition Interface with the electrical characteristics according to Section 8, Relay Status Acquisitions (Interface Data Sheet "RSA"; Receiver: EIU).

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EIU-783/CREATED/A

The failure propagation of a single failure in the relay status acquisition Interface shall be limited to the loss of max. 4 (TBC) relay status acquisition interfaces.

EIU-1025/CREATED/T,R

The status is provided by the users in the form of a relay contact or optocoupler.


The EIU shall acquire via the Relay Status Acquisition inputs the open/closed status of a relay/switch contact for conversion into one bit being "1" or "0", respectively using a pull-up resistor. The comparing input is referenced to signal ground. A closed contact corresponds to a "0" level and an open contact to a "1" level.

EIU-1028/CREATED/A,R

Adequate protection features shall be implemented in each redundant RSA interface to avoid failure propagation between the main and redundant interface.





3.4.4 Bi-Level Digital Telemetry Acquisition

EIU-797/ERS_555,ERS_508/T,R

The EIU shall provide 32 (tbc) Bi-Level Digital Telemetry Acquisition Interfaces.

EIU-798/CREATED/A,R

The EIU shall provide each Bi-Level Digital Telemetry Acquisition Interface with the electrical characteristics according to Section 8, Bi-Level Digital TM Acquisitions (Interface Data Sheet "BLD"; Receiver: EIU).

EIU-799/CREATED/A,R

The failure propagation of a single failure in the Bi-Level Digital Telemetry Acquisition Interfaces shall be limited to the loss of max. 4 (TBC) Bi-Level Digital Telemetry Acquisition Interfaces.

EIU-800/CREATED/T,R

The Bi-Level Digital Telemetry Acquisition Interface shall positively reflect the status of the function it monitors.

EIU-801/CREATED/T,R

In case of input open circuit the Bi-Level Digital Telemetry Acquisition Interface shall have a deterministic state.


Fault voltages shall be verified by WCA.



3.4.5 CPS

3.4.5.1 General Requirements

EIU-665/CREATED/T,R

The CPS (Chemical Propulsion System) function shall consist of two separate fully identical redundant CPS functions operated in hot or cold redundancy.

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EIU-666/GDI-1435,GDI-1788/T,R

Each CPS function shall provide the following interfaces:

• Pressure Transducers signal

• Flow Control Valve drive circuit (1 coils per FCV)

• Latch valve drive circuit

Note Latch Control Valve(LVC) micro switches acquired by Relay Status Acquisitions.

EIU-674/CREATED/T,R

The CPS function shall provide the active controller with all internal status information regarding the current control of the propulsion interfaces. (i.e FCV/ LVC status, arming status).

EIU-675/CREATED/A,R

No single failure of the EIU shall lead to damage of the FCV/LVC drive circuit.

EIU-678/CREATED/T,R

Each CPS function (main and redundant) shall have two interfaces:

• One for communication with the main controller and

• One for communication with the Redundant controller

3.4.5.2 LVC / FCV Overview

Diagram for LVC/FCV driver shown below.

LVDRIVERS

FCVDRIVERS

LVOPEN/CLOSE

POWERSWITCH

Controller

LV

COILS

FCV

COILS

LV CMD

LV STATUS

FCV CMD

LVDRIVERS

FCVDRIVERS

LVOPEN/CLOSE

POWERSWITCH

Controller

LVDRIVERS

FCVDRIVERS

LVOPEN/CLOSE

STARTDELAY/ON TIME

POWERSWITCH

EIU

Controller

LV

COILS

FCV

COILS

LV CMD

LV STATUS

FCV CMD

BLTM

Figure 3.4-2: Latch Valve / Flow Control Valve driver Architecture

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In Figure 3.4-2, 3 levels of Protection are provided by the LCL, LVC and the FCV. If an alternative architecture is proposed it shall provide 3 levels of protection.


The FCV Driver function shall accept CDMU commands at rates between 0.5Hz and 8Hz (TBC), and hence the maximum commandable on-time required at EIU level is 2 seconds plus an additional allocation of up to 2 seconds (tbc) to account for possible variations in the time that CDMU commands are received by the EIU., and ensure that there is no drop out of a continuous command.

If a thruster actuation duration is greater than 2 seconds is required, this is achieved by commanding on-times that spans the full cycle period in each successive 2 Hz (or faster) cycle. However the clock utilised to generate the CDMU commands sent to the FCV Driver function is not synchronised to the clock within the EIU used to decrement the on-time and delay within the FCV Driver function. Hence if a continuous on-time of greater of 2 seconds duration is required, to avoid the possibly of drop out at the end of each 0.5 Hz cycle, an on-time of slightly greater than 2 seconds (precise value TBD) will be loaded in each 0.5 Hz cycle.

3.4.5.3 CPS Detailed Requirements

3.4.5.3.1 Overview

EIU-700/CREATED/R

The EIU shall provide the following elements which have interfaces to the CPS function:

EIU-701/ERS_522/A,R

• 20 (TBC) latch valves (LVC): 10 main and 10 redundant, located in the thrusters and 2 valve associated with the tanks

EIU-702/ERS_522/T

• 16 (TBC) Flow control valves: 8 main and 8 redundant

Each one has one coil, which when energised opens the valve.

3.4.5.3.2 Latch Valve Control and Monitoring

EIU-706/GDI-1785/T,R

Each CPS function shall provide one LVC OPEN and one LVC CLOSE pulse on separate lines for each of the latch valves. These pulse drivers shall have the characteristics as defined in Section 8 (Interface Data Sheet "LVC").

EIU-707/CREATED/T,R

The CPS functions (main and redundant) shall ensure that, in response to either a LVC OPEN command or a LVC CLOSE command, it is not possible to energise the latch valve coils continuously for more than 1 sec.


The EIU CPS function shall be capable of operating on all 16 LVC OPEN commands for a given thruster branch within a period of less than 1 sec. (i.e. The time between reception of the first 'OPEN' command from the CDMU and the time at which the last LVC actuation pulse is completed shall be <1 sec.). This shall be possible by a single dedicated command and by discrete commands.

It is acceptable to operate up to 2 valves simultaneously


The EIU CPS function shall be capable of operating all 16 LVC CLOSE commands for a given thruster branch within a period of less than 1 sec. (i.e. The time between reception of the first 'CLOSE' command from the CDMU and the time at which the last LVC actuation pulse is completed shall be <1 sec.). This shall be possible by a single dedicated command and by discrete commands.

It is acceptable to operate up to 2 valves simultaneously

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Each latch valve driver shall respond to a STOP signal generated by the SpaceWire Controller in the event that the SpaceWire controller loses control communications with the CDMU. This signal shall terminate the driver immediately. It shall be possible to enable or disable this function on each latch valve driver individually at the time of manufacture.

3.4.5.3.3 Flow Control Valve Control and Monitoring

EIU-713/CREATED/T,R

The CPS function shall provide the means by which to start each of the 8 main and 8 redundant Thruster FCVs simultaneously from either control.

EIU-3402/ERS_737/T,R

It shall be possible to operate nominal and redundant FCV drivers functions in either hot or cold redundancy without constraint.


The operation of each FCV driver shall be controlled by three types of commands issued by the CSW (from CDMU):

• A control signal that is common to all FCV drivers on the interface board and is used to initiate thruster firings, FCV START. The FCV command shall be capable of initiating both A and B side simultaneously

• An individual delay time for each thruster ~ [0; 2.0s]; this is the time delay between the receipt signal above and the energising, via a pulse, of the FCV driver, FCV 1A/1B DELAY, FCV 2A/2B DELAY, etc.

• An individual on time for each thruster [0; 2.0s]; that represents the duration of the pulse, FCV 1A/1B DURATION,FCV 2A/2B DURATION, etc.

• On-times and delays shall be commandable on all thrusters at the same time


There shall be no single failure that:

• Shall propagate from A to B side or B to A side and prevent operation of either side

• Shall prevent operation of the START command

• Shall cause more than one FCV driver to function incorrectly (i.e incorrect timing duration, etc )

• Shall prevent a failed FCV drive from being isolated, isolation of an A or B branch is acceptable

•


The resolution of the delay time and the on-time shall be 1ms.


The FCV driver(s) shall respond to the FCV START command within 5 ms (TBC) of it being received at the EIU SpaceWire interface.


As long as the new FCV X DELAY and FCV X DURATION values are received at least 10ms(TBC) prior to the reception of the next FCV START command, these new delay and duration parameters shall be correctly implemented by the FCV driver function(s) when the FCV START command is received.

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If the FCV START command is received whilst the FCV is still open ( i.e., the previous FCV START command is still operating) then all previous delays and on-times shall be rendered ineffective and the FCV shall be operated in accordance with the new delay and on-times associated with the new FCV START command.


Upon an request from CSW , if the EIU receives a new on-time with a delay time set to zero, followed by the FCV START command, while the pulse is active, then the FCV Driver function shall maintain the firing of the valve for a duration equal to the new on-time without interruption."


No single failure within the EIU shall allow more than 1 thruster to remain active

EIU-715/CREATED/T,R

Each FCV driver shall provide an on-time-voltage to the valve coil to open the valve; the valve will close when the on-time-voltage is removed. The electrical characteristics shall be as defined in Section 8 , Data Sheet "FCV").

EIU-716/CREATED/T,R

The FCV drive shall not cause the FCV coil to be driven under the transient conditions of powering up or down any of the associated supplies.


The Flow Control Valve Command outputs shall provide redundant freewheeling diodes at the output lines.



3.4.5.4 Failure Requirements

EIU-723/CREATED/A,R

The CPS (prime and redundant) driver circuits shall be designed such that no failure can lead to the LVC being driven irrespective of whether the CPS function is ON or OFF (i.e. powered or unpowered).

3.4.5.5 Pressure Transducer

EIU-734/ERS_501/T,R

The EIU shall provide 4 (TBC) Pressure Transducer Acquisition Interfaces (PTA) to allow the simultaneous acquisition of four Pressure Transducer signals from the CPS.


The EIU shall provide each Pressure Transducer Acquisition Interface (PTA) with the electrical characteristics according to Section 8, Pressure Transducer Acquisition Interface (Driver: Pressure Transducer, Receiver: EIU; Interface Data Sheet "PTA").


No more than 1 PT signal shall be lost due to failure in EIU. No Failure within the EIU shall propagate to the Pressure transducer


PT Signals shall be available from either SpaceWire controller

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No failure of a PT acquisition circuit shall prevent either SpaceWire controller reading the remaining PT acquisition circuits.


A Failure in one PTA interface shall not effect the correct operation of the it's corresponding PTA interface on the alternate EIU side.

3.4.5.6 CPS Function Power Resource

EIU-738/CREATED/T,R

Each CPS function power resources shall include a protection and power-switching device.

EIU-739/CREATED/T,R

The switching of the power resources shall be ensured by a latching bi-level command through the SpaceWire interface to the EIU.

EIU-740/CREATED/T,R

No spurious commands shall be generated at power-on, power-off or due to a failure inside the power resources.

3.4.6 Command, Monitoring and Synchronisation Interfaces

3.4.6.1 SpaceWire Interface


The EIU shall provide (2 nom + 2 red) SpaceWire interfaces.

EIU-2314/GDI-2349/T,R

The SpaceWire Interfaces shall be compliant with Section 8.


The SpaceWire Interface data signalling rate for SVM and EIU shall be programmable up to 10 Mbps.


No single failure within the EIU shall cause the loss of prime and redundant SpaceWire link.

EIU-2318/GDI-2349/T,A,R

The interface shall be implemented with the electrical characteristics according to Section 8

EIU-2319/CREATED/A

The failure propagation of a single failure in the SpaceWire Interface shall be limited to the loss of 1 SpaceWire Interface.

3.4.6.2 SREM


The EIU shall be designed to be compatible with all 3 possible modes the Spacecraft Radiation Environmental Monitor (SREM) (provided by ESA)as defined by AD 6.


The three modes of operation shall be one of the following:-

• Autostart

• Autostart & Commanded OFF

• Commanded ON / Commanded OFF(default configuration)

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The EIU shall acquire the SREM DC/DC converter status.


The EIU shall be designed to be compatible with both modes of communication with the SREM as defined in EIU-2294.


The SREM command and data serial interface will be based on the following:-

• RS422 differential mode.


The EIU shall provide the following interface signals:-

• TC_sample

• TC_data

• TM_sample

• TM_data

• Clock


The EIU shall be compatible with SREM telecommands formats for:-

• Commands

• Register Bank

• Program memory

depicted in SREM ICD [AD tbd].


The EIU shall be compatible SREM telemetry formats for:-

• Register Bank

• Accumulation files

• Groups

• Acquisition files

• Program Memory


The EIU shall be compatible with SREM timings on the command and data serial lines interfaces.


The EIU shall leave the "ON-board programming" signal connected.


The EIU shall provide 1 SREM temperature thermistor input.


The EIU shall be compatible with SREM warm-up time of 4 hours.

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The EIU shall wait 1ms after SREM TC reception before SREM TM register.


The EIU shall meet a minimum time between two consecutive SREM telecommands of 500 microseconds.


The EIU shall meet a minimum time between two consecutive SREM TM data reads of 300 microseconds.

3.4.6.3 Standard High Power (SHP) ON/OFF

EIU-754/ERS_507,ERS_554,/T,R

The EIU shall provide in total but excluding internal (96 nom + 96 red tbc) SHP ON/OFF Pulse outputs operated in cold redundancy.

EIU-755/GDI-1226/A,R

The EIU shall provide each ON/OFF Pulse output with the electrical characteristics according to EIU-3381 "Standard High Power On/Off " (Interface Data Sheet "SHP"; Driver: EIU).

EIU-3366/CREATED

/T,R

The SHP function shall provide the following modes of operation:-

• Immediate mode

• Burst mode

EIU-3367/CREATED

/T,R

In the immediate mode, the SHP function shall provide the ability to execute one command immediately upon reception.


In the Burst mode, the SHP function shall provide the ability to execute 2 SHP simultaneously, upto 8 pairs within 1 sec (8Hz).


SHP commands are used for decentralised power switching or unit configuration purposes.


The SHP On/Off source shall implement diodes at the level of the driver (e.g. by means of 2 serial diodes or equivalent) to allow unit external OR-ing of commands

EIU-756/CREATED/A

The failure propagation of a single failure in the ON/OFF Pulse interface shall be limited to the loss of max. 8 (TBC)ON/OFF Pulse Commands



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3.4.6.4 EIU Test Interfaces

3.4.6.4.1 General

EIU-816/CREATED/T,R

The EIU shall provide test interfaces to enable various current limits, voltages to be monitored during system assembly and integration.

EIU-2328/CREATED/I

All test connectors shall have blanking plates fitted prior to delivery.


The EIU shall be tested using the SpaceWire interface as the command / telemetry communication bus.


Protection shall be implemented in accordance with Section 8.

3.5 EIU Operational Requirements

3.5.1 Observability Requirements

3.5.1.1 EIU Nominal HK Telemetry

EIU-946/ERS_45/T,R

The EIU shall provide HK telemetry via EIU standard acquisition function to identify unambiguously its internal status. As a minimum, the following HK telemetry shall be provided:

• ON/OFF status of EIU

• ON/OFF status of EIU modules

• I/O boards ON/OFF status

• Failure Status

Further to be defined by the Contractor and provided within the TM / TC Database.

3.5.2 Commandability

3.5.2.1 ON/OFF Pulse Command Allocation

EIU-956/ERS_45/T,R

The EIU shall decode the packets received from the SpaceWire controller into external SHP ON/OFF Pulse Commands to be agreed via ICD.

Note: a typical external ON/OFF pulse command allocation is given in Annex 2.

EIU-957/CREATED/T,R

The subcontractor shall define the internal IO address allocation of Source Packets for the required EIU internal ON/OFF Pulse Commands.

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4 EIU SPECIFIC DESIGN AND INTERFACE REQUIREMENTS

4.1 Mechanical Design and Interface Requirements

4.1.1 Mass

EIU-980/CREATED/T,R

The EIU mass in flight configuration shall be lower than 8 kg . This shall be verified by mass measurement on the fully assembled unit.

4.1.2 Centre of Gravity

EIU-982/CREATED/T,R

As defined in Section 8

4.1.3 Envelope

EIU-984/CREATED/I

The unit including mounting feet and connectors shall not exceed the dimensions:

X x Y x Z: tbd mm x tbd mm x tbd mm

This shall be verified by dimension measurements.

4.2 Thermal Design and Interface Requirements

4.2.1 Heat Dissipation

EIU-987/CREATED/T,R

Depending on the operational status, the unit dissipation shall not exceed the following range:

Average* : 15W tbc

*: Average power is defined by:

EIU being in Nominal Mode ie

• SpaceWire controller A ON, B OFF

• Acquiring all telemetry at rate of 1Hz,

• Acquiring FSS analogue voltages

• CPS interface A ON and B OFF

• 5 FCV drivers operating at 50% duty

• SREM interface operating

Dissipation due to external loads is covered by efficiency requirements.


Thermal dissipation shall not vary by more than 2% over any 6 hour period with the EIU defined in a constant operating condition as described in EIU-987.

4.2.2 EIU Thermal Properties

EIU-989/CREATED/T,R

The GDIR [AD 2] section 3.3 is applicable.

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EIU-2279/ERS_701,GDI-2583/A,R

The unit thermal design shall consider a heat sink all around the unit ( on a PI steradian) with temperature range defined in [AD 2]/GDI-2583.

EIU-2280/ERS_702/A,R

The unit thermal design shall consider a maximum thermal conductance of 0.015 W/K at each unit fixation foot (e.g commensurate with insulation through GFRP washers).

EIU-2281/ERS_704,GDI-258/A,R

All other unit boxes faces shall have an emissivity greater than 0.8.

To allow re-use of potential off the shelf units, the unit supplier may propose to add a radiator plane between the unit and the SVM panel as described below :

Heat sink allaround the unit

Unit

Thermal washerson each unitfixation foot

Additionalradiator plane

Figure 4.2-1: Unit Thermal Environment

EIU-2283/ERS_706/A,R

If such alternative unit accommodation is necessary to allow reuse of an existing unit, then

• the size of the additional radiator plane shall be agreed with Gaia Prime thermal architect

• the upper size of the radiator panel shall have an emissivity higher than 0.8

• the lower side of the radiator panel shall be left unpainted.

4.2.3 Temperature Limits

EIU-991/CREATED/T,R

The GDIR [AD 2] is applicable as defined in section 3.3

4.3 Fine Sun Sensor

4.3.1 EIU Fine Sun Sensor Interface

There are three (TBC) Fine Sun Sensors (FSS), each provides an analogue voltage in the range 0-5V. Inside the FSS, there are 4 cells, selection is via 3 bit binary code(TBC) from the EIU. Each analogue voltage from the FSS is fed to both the nominal and redundant EIU. The process of acquiring the analogue voltages from the FSS's is envisaged to be as follow:-

• CDMU send a command to EIU to acquire FSS1.

• EIU acquires and digitises all the voltages from the four cells in FSS1.

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• EIU stores the results in registers.

• CDMU requests FSS1 values from the EIU FSS1 registers.


The EIU Fine Sun Sensor Interface function shall consist of two separate fully identical redundant functions operated in cold redundancy.


Each EIU Fine Sun Sensor Interface function shall be cross-strapped to the main and redundant controller.


The EIU shall provide three independent groups of 3 + 3 (TBC) digital output lines with 0 -12 V(TBC) CMOS compatible logic levels.


The EIU controller hardware shall provide a means of using these three lines as address lines for an external sun sensor.


The 3 address shall be capable of having a latched binary code (TBC) received via the SpaceWire communication bus.


The 3 address lines from the nominal EIU shall be capable of being "OR'ed with the 3 address lines from the redundant EIU.


The EIU shall receive the following commands:-

• ACQ_FSS1 (Acquire all 4 cells from FSS1)



• FSS1_RD ( CDMU reads all four FSS1 registers)



• GET_ALL (Acquire all 12 cells from FSS1, 2, 3 order of cells TBC)

Note that the above command is generalised. The supplier can provide/suggest an alternative scheme as long the requirement to pass the digitised parameter back to the CDMU is met.


All registers containing the FSS digitised values shall be latched with the new values when commanded.


Any FSS register can be read when commanded.


The EIU shall provide a status register showing status of at least the of the following:-

• Flag to signify when FSS1, FSS2, FSS3 has completed acquisitions

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• Acq Busy flag

FSS TimingACQ FSS x

Digitise FFx/c1 Digitise FFx/c4Digitise FFx/c2 Digitise FFx/c3

READ FSSxSpW Bus

EIU ADC

Acq Flag

< 15 mS

FSS addr00 01 10 11

Figure 4.3-1: Fine Sun Sensor Timing Diagram


The EIU shall execute the following functions in a time duration of less than 15 ms (tbc)

• Receive and decode the acquisition request command from the CDMU

• Set the address for the first FSS sensor cell

• Hold for 2ms (TBC) to allow the FSS signal to stabilise

• Acquire the analogue voltage and digitise

• Store the result in a register

• repeat for the remaining 3 sensor cells

• Set Acq flag to inform CDMU processor that all four sensor cell digitised result are available.


No common element within each FSS Interface Function of each EIU half that, if failed, might cause the loss or corruption of the output from more than one FSS at a time shall be permitted unless that element has explicit failure monitoring (independent of the FSS behaviour) to allow the CDMU to recognise and isolate the failure at EIU level.

Requirement EIU_3403 means, for example, that if all FSS output signals are to be digitised by a single ADC, then there shall be specific exercising and testing of the ADC routinely performed by the EIU as part of its internal failure monitoring that will unambiguously flag to the CDMU a failure of the ADC before the CDMU is presented with 3 sets of anomalous FSS outputs by the EIU.


The EIU shall be able to receive and execute the sequence of ACQ_FSSx commands within 10ms(TBC). i.e. the 15ms data acquisition processes shall be able to run in parallel such that there can be as little a 10ms between the raising of the FSS1 Acq flag and the raising of the FSS3 Acq flag.

4.3.2 FSS Power Supply

EIU-3024/CREATED/R

The EIU shall provide 3(nom) + 3(red) (TBC) power supply interfaces.


Each power supply shall supply +14V and -14V (TBC) output voltages.


The tolerance of each voltage rail shall be +- 1%

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Each power supply shall have +- 20mA (TBC) maximum capability.


Each output shall withstand an external fault voltage of 28V (TBC).


Each output shall be protected against short circuit.

4.3.3 FSS Outputs


The EIU shall provide three groups of 4(nom) + 4(red) (TBC) 16 bit registers to store the digitised results from the FSS's.


Each FSS register shall store the result in the 12 least significant bits. The four upper bits shall be set to logical 0.


The EIU shall digitise each input from the FSS with a noise level of less than 3mV r.m.s (TBC) ( 2 LSB).

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5 GENERAL DESIGN AND INTERFACE REQUIREMENTS

5.1 GDIR Applicability


The General Design and Interface Requirements (GDIR) [AD 2] are applicable as defined in section 3.5.

5.2 EIU RAM Specific Requirements

5.2.1 Reliability

EIU-1285/GDI-32,GDI-34,ERS_417,MODIFIED/A,R

The EIU design shall achieve a reliability of 0.9846 (tbc) taking into account the periods for

• on-ground testing and storage as defined in Section 8.

• in-orbit operation of 60 months as defined in Section 8.

EIU-3411/ERS_32/A

The Lifetime in orbit of the EIU shall be 6.5 years from launch. This includes transfer to L2, commissioning, nominal and extended mission duration applicable to Gaia mission. this lifetime shall be considered for consumables and external surface properties definition.

5.2.2 Availability


The EIU hardware shall allow to elaborate an BIT with a test coverage better than 90%.

EIU-1291/CREATED/T

The detection of any failure during tests shall be reported via the SpaceWire interface link..

5.2.3 Maintainability

EIU-1293/CREATED/R

The design shall ensure a minimum effort for maintainability (with minimum need for special tools (if any), equipment calibration, adjustment or fault identification. Maintenance shall have no impact on the system performance and interfaces and has to be documented in a special procedure.

5.2.4 EIU Fault Tolerance Requirements


The EIU shall be single point failure (SPF) free. Any unavoidable single point failure shall be identified as critical item and approval shall be obtained from the platform contractor / prime contractor / ESA prior to implementation.


No single failure inside the EIU shall cause permanent loss of function or performance of the EIU. Full function and performance shall be reobtained by activation of the redundancy.


No single failure inside the EIU shall cause inadvertent activation of any outputs.


No single failure shall cause the loss of the nominal and the redundant part of EIU functions.


No single failure, neither SEU nor firmware caused errors, shall lead to the occurrence of the following feared events:

• operational degradation of more than one SpaceWire bus

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• inadvertent or erroneous HPC-type 3 commands

• permanent command of one LVC

• permanent commands of one FCV


Redundancy shall be incorporated at all levels where required to eliminate critical failure and to meet the required fault tolerance.


Implementation of mutually redundant functions on the same board shall be avoided to prevent propagation of failures.

5.3 Identification & Marking

EIU-2285/CREATED/I

The EIU shall be identified as per [AD 2].

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6 PRODUCT ASSURANCE REQUIREMENTS

EIU-1314/CREATED/R

The Product Assurance Requirements for Subcontractors [AD 5].

EIU-1315/CREATED/R

The Software Product Assurance Requirements for Subcontractors [AD 3].

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7 VERIFICATION REQUIREMENTS

7.1 Required Analyses

EIU-1318/CREATED/R

See Phase C/D EIU Statement of Work (SOW).

7.2 Required EIU Level Tests

7.2.1 Functional/ Performance Tests

EIU-1321/CREATED/R

Functional and performance parameters derived from above requirements shall be measured/ verified under relevant boundary conditions.

EIU-1322/CREATED/R

The subcontractor shall demonstrate by means of functional and performance tests that there is no degradation caused by environmental testing.

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8 GDIR APPLICABILITY MATRIX

The following table lists the applicable requirements of the GDIR.

It contains, in the first column, the Local ID for each applicable GDIR requirement number.

The second column contains the GDIR Requirement number and the opening text of the requirement.

The third column defines the Applicability Y/N

The final column shows the intended verification method. If no verification method is given it shall be assumed that verification is required and method is TBD.

Req No. Reference Applicability Verif. Method

3 General Design and interface Requirements 3.1 General Design Requirements 3.1.1 Lifetime EIU-3433 GDI-31:

The on-ground lifetime of flight hardware is defin ... Y R

EIU-3434 GDI-32: The Unit shall meet the requirements of this speci ...

Y A,R

EIU-3435 GDI-33: The in-orbit lifetime of the satellite is defined ...

Y R

EIU-3436 GDI-34: The unit shall be designed with positive margins o ...

Y A,R

EIU-3437 GDI-2700: The units shall be compatible with a storage perio ...

Y

EIU-3438 GDI-35: Maintenance during storage shall be as limited as ...

Y R

3.1.2 Design Safety EIU-3440 GDI-37:

The unit shall be designed and fabricated with com ... Y A

EIU-3441 GDI-38: General safety requirements for units are as follo ...

Y A

3.1.3 Venting EIU-3443 GDI-41:

The unit shall be able to operate within a pressur ... Y A,R

EIU-3444 GDI-42: For all relevant thermal hardware, explicitly MLI, ...

Y R

EIU-3445 GDI-43: Unless a cavity is hermetically sealed adequate me ...

Y R

EIU-3446 GDI-44: Structural members (honeycomb panels, in particula ...

Y T,A

3.1.4 Interchangeability EIU-3448 GDI-46:

All spacecraft units of the same part or configura ... Y R

3.1.5 Identification & Marking EIU-3450 GDI-50:

The unit hardware shall be identified with a namep ... Y I

EIU-3451 GDI-2253: The unit identification nameplate shall be mounted ...

Y

EIU-3452 GDI-2254: For the particular case of connector identificatio ...

Y

3.1.6 Accessibility/Maintainability EIU-3454 GDI-52:

The design of the unit, the position of the connec ... Y R

EIU-3455 GDI-53: The equipment shall be designed to require a minim ...

Y R

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EIU-3456 GDI-54: No field maintenance, servicing or adjustment shal ...

Y R

3.1.7 Transportation, Handling and Storage 3.1.7.1 Transport EIU-3459 GDI-2272:

The unit containers, covers (for optics and expose ... Y

EIU-3460 GDI-2273: The transport container shall ensure that the envi ...

Y

EIU-3461 GDI-2274: The storage container shall be designed to protect ...

Y

3.1.7.2 Unit packing EIU-3463 GDI-2275:

Where applicable blanking caps shall be fitted to ... Y

EIU-3464 GDI-2276: All units shall be packaged to ensure that it is s ...

Y

3.1.7.3 Container identification EIU-3466 GDI-2277:

Each container shall be labelled, tagged or marked ... Y

EIU-3467 GDI-2278: In addition to the above, the container shall also ...

Y

3.1.7.4 Handling EIU-3469 GDI-2271:

Units weighing more than 10 kg shall be equipped w ... Y

3.1.7.5 Thermally Conductive Materials EIU-3471 GDI-70:

Unless justified and agreed beforehand, any therma ... Y I,R

3.1.7.7 Seals EIU-3473 GDI-75:

Any seals used shall comply with all the applicabl ... Y R

EIU-3474 GDI-76: Any seals requiring periodic replacement during gr ...

Y R

3.1.7.8 Lubricants and Sealants EIU-3476 GDI-78:

No lubricants shall be used without the prior writ ... Y R

3.1.7.9 Screw Locking EIU-3478 GDI-80:

All fasteners used on the unit shall be locked by ... Y I,R

EIU-3479 GDI-2270: All screw type hardware used on the unit shall be ...

Y

3.2 Mechanical Design and Interface Requirements EIU-3481 GDI-82:

All drawings, specifications and engineering data ... Y R

EIU-3482 GDI-83: Units shall be compliant with ECSS-E30 Part 2A, an ...

Y R

EIU-3483 GDI-84: Following testing the unit shall be inspected to c ...

Y I

EIU-3484 GDI-87: No unit shall generate microvibration loads at its ...

Y A,R

3.2.1 Structural Design 3.2.1.1 General Requirements EIU-3487 GDI-91:

The following failure modes, for units at all leve ... Y A

EIU-3488 GDI-92: The unit shall be designed to withstand the enviro ...

Y A,R

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EIU-3489 GDI-2282: The design of the units handling and transportatio ...

Y A

EIU-3490 GDI-94: Wherever practical a fail safe design based on red ...

Y A

EIU-3491 GDI-95: In cases where a failsafe design cannot be impleme ...

Y A

EIU-3492 GDI-2045: All potential fracture critical items shall be sub ...

Y A

3.2.1.2 Mass properties EIU-3494 GDI-2284:

A mass justification shall be provided indicating ... Y R

EIU-3495 GDI-98: All mass estimations shall be accompanied by the d ...

Y T

EIU-3496 GDI-100: The mass of an item must be measured with the foll ...

Y T

3.2.1.3 Centre of Gravity and Moment of Inertia EIU-3498 GDI-102:

All COG and MOI estimates shall be accompanied by ... Y A

EIU-3499 GDI-104: The unit centre of gravity shall be determined wit ...

Y T,A

EIU-3500 GDI-105: The unit moment of inertia shall be determined wit ...

Y A

3.2.1.4 Stiffness requirement 3.2.1.4.1 Definitions and General Requirements EIU-3503 GDI-2288:

Units fixed on a rigid interface shall have their ... Y T

EIU-3504 GDI-2289: The stiffness requirements shall be demonstrated t ...

Y A

3.2.1.4.2 Mechanical Analysis EIU-3506 GDI-2539:

Finite Elements Models (FEM) shall be prepared to ... Y A

EIU-3507 GDI-2540: The adequacy of the FEM to predict thermo-elastic ...

Y A

EIU-3508 GDI-2541: The FEM of the represented item in its launch conf ...

Y A

EIU-3509 GDI-2542: The FEM of the equipment shall be verified and cor ...

Y A

EIU-3510 GDI-2544: Reduced FEM mathematical models to be employed in ...

Y A

EIU-3511 GDI-2546: Adequate models to calculate Centre of Mass and Mo ...

Y A

3.2.1.5 Strength Requirements 3.2.1.5.1 Definitions and General Requirements EIU-3514 GDI-2354:

The design load factor philosophy of the GAIA spac ... Y A

EIU-3515 GDI-2366: GAIA equipment mechanical testing shall take into ...

Y T

EIU-3516 GDI-2367: GAIA equipment mechanical testing shall take into ...

Y T

EIU-3517 GDI-2368: An additional Protoflight Factor of Safety, FOSPF ...

Y T

3.2.1.5.2 Margin Of Safety & Safety Factors EIU-3519 GDI-2370:

For all Gaia elements the design factor, FOSD = 1. ... Y A

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EIU-3520 GDI-2371: Where design loads are generated using FE analyses ...

Y A

EIU-3521 GDI-2372: The GAIA hardware shall be able to withstand, with ...

Y T,A

EIU-3522 GDI-2375: All mechanical elements shall demonstrate positive ...

Y A

EIU-3523 GDI-2380: The margins of safety for all elements of the unit ...

Y A

EIU-3524 GDI-2381: All bolts shall be sized to prevent sliding under ...

Y A

EIU-3525 GDI-2502: Initially conservative friction coefficients regar ...

Y A

EIU-3526 GDI-2382: Wherever applicable, rules for general design of b ...

Y A

EIU-3527 GDI-2383: In addition, in case of combined loads due to ther ...

Y A

EIU-3528 GDI-2385: where T, S and M are applied values including safe ...

Y

EIU-3529 GDI-2386: Method for evaluation of dimensioning loads/stress ...

Y A

EIU-3530 GDI-129: The units shall be designed with positive margins ...

Y A

EIU-3531 GDI-130: The design loads for the structure elements are to ...

Y A

EIU-3532 GDI-131: The internal loads (thermo elastic, pre-stressed m ...

Y A

EIU-3533 GDI-132: For the computation of the design loads the maximu ...

Y A

EIU-3534 GDI-2297: For sine and random vibrations, the mechanical siz ...

Y A

3.2.1.6 Alignment and Stability EIU-3536 GDI-2550:

The stability of the equipment shall comply with r ... Y T,A

EIU-3537 GDI-2548: The following causes of misalignment shall be anal ...

Y T,A

3.2.2 Design Requirements 3.2.2.1 Attachment Requirements EIU-3540 GDI-160:

For the preliminary determination of the requested ... Y A

EIU-3541 GDI-161: The attachment points shall provide a controlled s ...

Y I,R

EIU-3542 GDI-162: The interface plane flatness of a unit shall be be ...

Y I

EIU-3543 GDI-163: The mechanical mounting interface shall be consist ...

Y R

EIU-3544 GDI-164: The unit bolts type and number shall be defined to ...

Y R

EIU-3545 GDI-165: Unless otherwise specified all units shall be thro ...

Y I,R

EIU-3546 GDI-2132: To minimise CoG uncertainty of the unit when mount ...

Y I,R

EIU-3547 GDI-168: Unless special conditions override, the thickness ...

Y I,R

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EIU-3548 GDI-169: For the unit mounting, provision shall be made for ...

Y I,R

EIU-3549 GDI-2123: Unit Lug/Hole Design Requirements: Unit mounting h ...

Y I,R

EIU-3550 GDI-170: Sufficient clearance shall be allowed between mech ...

Y I,R

EIU-3551 GDI-171: Requirement deleted ...

Y A

EIU-3552 GDI-173: Fasteners shall be procured and tested according t ...

Y I

EIU-3553 GDI-2599: Fasteners shall comply with the requirements of EC ...

Y T,A

EIU-3554 GDI-2600: Fasteners smaller than diameter 5 mm shall not be ...

Y R

EIU-3555 GDI-2598: Titanium alloy fasteners shall not be used in safe ...

Y R

EIU-3556 GDI-174: The Flight equipment shall be able to survive:- - ...

Y A

3.2.2.3 Electrical connectors EIU-3558 GDI-2302:

All electrical connectors shall be located at a mi ... Y R

EIU-3559 GDI-2303: Connectors shall be arranged in such a way that th ...

Y I,R

EIU-3560 GDI-2304: Unit shall offer means to mechanically lock male a ...

Y I,R

3.2.3 Mechanical / Optical Interface Control Documents EIU-3562 GDI-183:

The mechanical and optical configuration and its i ... Y A

EIU-3563 GDI-184: Interfaces will be subjected to a formal inspectio ...

Y T,I

EIU-3564 GDI-185: The issues of ICDs have to be released as defined ...

Y A

EIU-3565 GDI-186: One of the attachment holes on a unit shall be spe ...

Y R

EIU-3566 GDI-187: The unit reference frame shall have its origin at ...

Y R

EIU-3567 GDI-188: The unit alignment reference frame shall have its ...

Y R

EIU-3568 GDI-190: The dimensioning of the attachment hole pattern sh ...

Y A

EIU-3569 GDI-191: Interface Control Drawings shall be provided to th ...

Y R

3.2.4 Mechanical Mathematical Model Requirements 3.3 Thermal Design and Interface Requirements 3.3.1 Definition of Temperatures and Terms 3.3.1.1 Radiatively Controlled Unit EIU-3574 GDI-239:

In the frame of GAIA, all units shall be radiativ ... Y R

3.3.1.2 Conductively Controlled Unit EIU-3576 GDI-241:

All units which were conductively controlled in pr ... Y R

3.3.1.3 Isothermal Unit

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EIU-3578 GDI-244: For radiative units the temperature difference bet ...

Y R

EIU-3579 GDI-245: For conductive units the temperature difference be ...

Y R

EIU-3580 GDI-246: For units not fulfilling GDI-244/245 additional th ...

Y R

3.3.1.4 Temperature Reference Point (TRP) EIU-3582 GDI-248:

The temperature reference point (TRP) shall be sel ... Y R

3.3.2 Thermal Interface Requirements 3.3.2.1 Conductive Interface EIU-3585 GDI-252:

The mounting interface shall comply with the mecha ... Y A

EIU-3586 GDI-253: Unit mounting areas shall not be painted or anodis ...

Y R

EIU-3587 GDI-254: All units dissipating significantly through their ...

Y R

EIU-3588 GDI-255: Local heat flux shall not be greater than 1.5x spe ...

Y A

3.3.2.2 Radiative Interface EIU-3590 GDI-258:

Units shall be designed with an emittance > 0.8 (b ... Y R

EIU-3591 GDI-2582: Units shall demonstrate compliance to their design ...

Y T,A

3.3.2.3 Internal Temperature Monitoring EIU-3593 GDI-260:

Temperature monitoring of selected points within a ... Y R

EIU-3594 GDI-261: The location, type and electrical interface of all ...

Y R

3.3.3 Thermal Design Requirements EIU-3596 GDI-2657:

The units shall take into account the following de ... Y

EIU-3597 GDI-263: The units shall be designed such that all internal ...

Y A

EIU-3598 GDI-264: Hot spots on the external surface of the unit are ...

Y A,R

EIU-3599 GDI-2656: In the absence of any uncertainty analysis an init ...

Y A

EIU-3600 GDI-2079: For units located outside of the Focal Plane Assem ...

Y A,R

3.3.4 Thermal Control 3.3.4.1 General EIU-3603 GDI-2555:

The equipment thermal control shall comply with EC ... Y T,A,R

EIU-3604 GDI-2556: The equipment thermal control shall be achieved pr ...

Y R

EIU-3605 GDI-2557: The equipment thermal control design shall permit ...

Y A

EIU-3606 GDI-2558: The equipment thermal control must be testable on ...

Y T,A

EIU-3607 GDI-2559: If special equipment is required to evacuate the h ...

Y T,I

EIU-3608 GDI-2560: No thermal control item shall prevent the spacecra ...

Y R

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EIU-3609 GDI-2561: Deviations and temporal degradations from the nomi ...

Y A

EIU-3610 GDI-2562: A Thermal Reference Point (TRP) shall be defined a ...

Y A

EIU-3611 GDI-2563: The TRP temperature also called "interface tempera ...

Y A

EIU-3612 GDI-2564: In addition, the TRP temperature shall be monitore ...

Y T

EIU-3613 GDI-2565: The equipment thermal control shall include and mo ...

Y A,R

EIU-3614 GDI-2566: The design limits of units are equal to the qualif ...

Y T,A

EIU-3615 GDI-2567: The design limits of units are equal to the accept ...

Y T,A

3.3.4.2 Thermal Analysis EIU-3617 GDI-2552:

Mathematical models in ESARAD and ESATAN shall be ... Y A

EIU-3618 GDI-2553: The Geometrical and Thermal Mathematical Models (G ...

Y T,A

3.3.5 Thermal Interface Control Documents EIU-3620 GDI-267:

All thermal hardware mounted on the unit shall be ... Y R

EIU-3621 GDI-269: All unit thermal interfaces shall be described wit ...

Y R

3.3.6 Thermal Mathematical Model Requirements 3.3.6.1 Thermal Interface Modeling EIU-3624 GDI-2091:

The use of the ESARAD and ESATAN software packages ... Y A,R

EIU-3625 GDI-272: The Thermal mathematical model shall be provided f ...

Y A

EIU-3626 GDI-273: Units: All units used in thermal models (geometric ...

Y A

3.3.6.2 Thermal Model Correlation EIU-3628 GDI-275:

The detailed thermal model of a unit shall be veri ... Y T,A

3.3.6.3 Reduced Thermal Model EIU-3630 GDI-277:

The consistency between reduced and detailed therm ... Y A

EIU-3631 GDI-278: The convergence of the thermal models shall be dem ...

Y A

3.5 Electrical Design and Interface Requirements 3.5.1 General Requirements EIU-3634 GDI-308:

All electrical performances are specified under Wo ... Y R

EIU-3635 GDI-309: Beginning-Of-Life criteria shall be derived by the ...

Y R

3.5.2 Power Interface Requirements (LC & FC) EIU-3637 GDI-2046:

The design of the FCLs and of all essential loads ... Y T,A

3.5.2.1 Regulated Power Requirements EIU-3639 GDI-338:

All units connected to the fully regulated bus sha ... Y T,A

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EIU-3640 GDI-2696: During all mission phases the spacecraft power bus ...

Y T

EIU-3641 GDI-2104: The spacecraft fully regulated bus shall have a no ...

Y T,R

EIU-3642 GDI-2103: For load changes of up to 50% of the nominal load ...

Y T,R

EIU-3643 GDI-2133: The bus voltage shall remain within 5% of its nomi ...

Y T,R

EIU-3644 GDI-339: If undervoltage protection is implemented by the l ...

Y T

EIU-3645 GDI-340: In case of an inductive load, when considering the ...

Y T,A

EIU-3646 GDI-341: The load shall not be irreversibly degraded for an ...

Y R

EIU-3647 GDI-342: No fuse protection shall be implemented. ...

Y R

EIU-3648 GDI-343: Primary current protection shall not be implemente ...

Y R

EIU-3649 GDI-344: The contractor shall design the load side of the L ...

Y T,R

EIU-3650 GDI-346: All power converters shall be designed to allow op ...

Y T

EIU-3651 GDI-347: The free-running frequency shall be limited to ±10 ...

Y T

EIU-3652 GDI-348: The as designed free-running frequency and frequen ...

Y T

EIU-3653 GDI-349: Units connected to LCL's or FCL's shall be designe ...

Y T,A

EIU-3654 GDI-1273: At the point of regulation, the impedance of the v ...

Y T,R

EIU-3655 GDI-352: The contractor shall design his side of the Regula ...

Y T,R

EIU-3656 GDI-354: Following switch-ON, and during input filter charg ...

Y T,R

3.5.2.2 Power Consumption Requirements EIU-3658 GDI-361:

The compliance versus the power allocations shall ... Y T,A

EIU-3659 GDI-362: For each power interface circuit, the following co ...

Y T,A

EIU-3660 GDI-363: A power consumption test shall be required at temp ...

Y T,R

3.5.2.3 Tolerance to Power Bus Failures EIU-3662 GDI-365:

When a unit is internally redundant, and the suppl ... Y T,A

3.5.2.4 Initial Electrical Status EIU-3664 GDI-367:

Upon application of power in nominal conditions al ... Y T

3.5.2.5 Special Case: Secondary Power Supplied Units EIU-3666 GDI-370:

It shall be possible to switch on the source unit ... Y T

EIU-3667 GDI-371: The source unit shall be protected against short-c ...

Y T

EIU-3668 GDI-372: The supplied unit and Electrical I/F shall withsta ...

Y T,A

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3.5.3 Standard Signals 3.5.3.1 General Conventions EIU-3671 GDI-378:

Specified driver (or source) characteristics shall ... Y R

EIU-3672 GDI-379: All data and signal interface drivers shall surviv ...

Y T,A

EIU-3673 GDI-380: The unit shall tolerate active signal I/Fs when un ...

Y T,A

EIU-3674 GDI-381: In case the electrical architecture does foresee c ...

Y T,R

EIU-3675 GDI-382: In case no load is specified, the characteristics ...

Y R

3.5.3.2 Harness Capacitance EIU-3677 GDI-391:

Interface signal drivers shall consider the capaci ... Y A

3.5.4 Connectors General Design Requirements 3.5.4.1 Harness EIU-3680 GDI-395:

Cables falling into different EMC classifications ... Y I,R

EIU-3681 GDI-396: All cable bundles shall be routed as close as poss ...

Y I,R

EIU-3682 GDI-397: In wiring through connectors all leads shall be ke ...

Y I,R

EIU-3683 GDI-398: The DC resistance between the single cable shield ...

Y T

EIU-3684 GDI-399: The structure termination of shields shall be made ...

Y I,R

3.5.4.2 Connector Types EIU-3686 GDI-401:

All connectors mounted on units shall be D*MA** co ... Y R

EIU-3687 GDI-402: All flight connectors shall be designed to withsta ...

Y I,R

EIU-3688 GDI-2158: Individual mate/demates shall be recorded in a mat ...

Y R

EIU-3689 GDI-2157: The number of times flight connectors are mated / ...

Y R

EIU-3690 GDI-2156: If by prior agreement with S/C Prime the number of ...

Y I,R

EIU-3691 GDI-403: Different connector classes shall be implemented i ...

Y R

3.5.4.3 Connector Characteristics EIU-3693 GDI-405:

Connectors at interfaces shall be clearly identifi ... Y R

EIU-3694 GDI-406: Connectors shall not be a source of single point f ...

Y R

EIU-3695 GDI-407: Equipment or structure-mounted connectors shall be ...

Y R

EIU-3696 GDI-408: Male and female connectors shall be mechanically l ...

Y R

EIU-3697 GDI-409: Active lines together with their return shall be o ...

Y I

EIU-3698 GDI-410: Connectors shall be made of Non magnetic material ...

Y R

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EIU-3699 GDI-411: For any unit connector which contains a number of ...

Y T,R

EIU-3700 GDI-412: Nominal and redundant lines shall have separated c ...

Y R

3.5.4.4 Connector Mounting EIU-3702 GDI-414:

All electrical connectors shall be located at a mi ... Y R

EIU-3703 GDI-415: Connectors shall be arranged in such a way that th ...

Y R

EIU-3704 GDI-416: Mechanical methods in conjunction with identificat ...

Y I,R

EIU-3705 GDI-417: Connector savers shall be utilized on all flight s ...

Y R

EIU-3706 GDI-418: The connection shield ground pin to case shall be ...

Y R

3.5.4.5 Test Connectors EIU-3708 GDI-420:

Test connectors shall have sufficient protection t ... Y R

EIU-3709 GDI-421: Test connectors shall be protected by EMC metal co ...

Y I,R

EIU-3710 GDI-422: The metallic protection cover shall be capable of ...

Y R

3.5.5 Standard Interfaces 3.5.5.1 ECSS-E-50-12A: SpaceWire EIU-3713 GDI-2388:

The applicable version of the ECSS-E-50-12A SpaceW ... Y I

3.5.5.1.1 Terms, Definitions & Abbreviated Terms EIU-3715 GDI-2387:

The terms, definitions, abbreviated terms and conv ... Y I

3.5.5.1.2 Physical Layer 3.5.5.1.2.1 Cables EIU-3718 GDI-2396:

The cable definition and construction requirements ... Y I,R

3.5.5.1.2.2 Connectors EIU-3720 GDI-2400:

The connector definition and construction requirem ... Y I,R

3.5.5.1.2.3 Cable Assembly EIU-3722 GDI-2402:

The cable assembly requirement of the ECSS-E-50-12 ... Y T,I

EIU-3723 GDI-2662: For each unit external SpaceWire link connector(s) ...

Y T,A

3.5.5.1.2.4 Printed Circuit Board (PCB) & Backplane Tracking

EIU-3725 GDI-2404: The PCB and backplane tracking requirements of the ...

Y I,R

3.5.5.1.3 Signal Layer 3.5.5.1.3.1 Low Voltage Differential Signaling (LVDS) EIU-3728 GDI-2406:

All the SpaceWire links shall use Low-Voltage Diff ... Y I,R

EIU-3729 GDI-2407: The LVDS driver and receiver interfaces shall be d ...

Y T

3.5.5.1.3.2 Failsafe Operation of LVDS EIU-3731 GDI-2410:

The LVDS failsafe operation requirements of the EC ... Y T,I,R

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EIU-3732 GDI-2408: No LVDS configuration involving more than one (1) ...

Y T,I,R

3.5.5.1.3.3 Signal Coding EIU-3734 GDI-2414:

The signal coding requirements of the ECSS-E-50-12 ... Y I,R

EIU-3735 GDI-2413: The data-strobe system shall carry an ‘encoded’ cl ...

Y T,I,R

EIU-3736 GDI-2412: A SpaceWire data interface shall consist of a link ...

Y I,R

3.5.5.1.3.4 Data Signalling Rate EIU-3738 GDI-2416:

After a reset or disconnect the SpaceWire link tra ... Y T

EIU-3739 GDI-2515: The lower limit to data signalling rate shall be 2 ...

Y I,R

EIU-3740 GDI-2418: After the link connection has been established suc ...

Y T


Y T


Y T

3.5.5.1.3.5 Skew & Jitter EIU-3744 GDI-2423:

In accordance with the definition of skew, jitter ... Y T

EIU-3745 GDI-2424: In accordance with the definition of skew, jitter ...

Y T

EIU-3746 GDI-2425: In accordance with the definition of skew, jitter ...

Y T

3.5.5.1.4 Character Layer 3.5.5.1.4.1 Data Characters, Control Characters & Codes EIU-3749 GDI-2398:

The data character, control character and control ... Y I,R

3.5.5.1.4.2 Parity Coverage EIU-3751 GDI-2427:

The parity bit coverage requirements of the ECSS-E ... Y I,R

3.5.5.1.4.3 First Null Token after Reset or Link Error EIU-3753 GDI-2430:

The first Null Token transmitted after reset or li ... Y T

3.5.5.1.4.4 Time Interface 3.5.5.1.5 Exchange Layer 3.5.5.1.5.1 Link-characters & Normal-Characters EIU-3757 GDI-2454:

The requirements related to the separation of Spac ... Y R

3.5.5.1.5.2 Flow Control EIU-3759 GDI-2455:

The requirements related to the SpaceWire link flo ... Y T,A

EIU-3760 GDI-2457: Any on-board SpaceWire node shall expand the excha ...

Y T,A

EIU-3761 GDI-2495: The SpaceWire link interface "Credit Counter" and ...

Y I,R

EIU-3762 GDI-2496: The highest order of priority for transmission of ...

Y I,R

3.5.5.1.5.3 End-to-End Data Flow Architecture EIU-3764 GDI-2500:

The host system on SpaceWire TX side shall contain ... Y T,A

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EIU-3765 GDI-2510: The SpaceWire node TX Output Buffer shall be contr ...

Y T,A

EIU-3766 GDI-2511: The host systems on both ends shall allow for the ...

Y T,A

EIU-3767 GDI-2512: No desynchronisation of CCSDS packet handling nor ...

Y T,A

EIU-3768 GDI-2456: The host system on SpaceWire RX side shall contain ...

Y T,A

3.5.5.1.5.4 State Machine EIU-3770 GDI-2513:

Any on-board SpW node shall provide link managemen ... Y I,R

EIU-3771 GDI-2514: Any on-board SpW node shall accept the following t ...

Y I,R

EIU-3772 GDI-2517: The reset of the SpaceWire link interface state ma ...

Y T

3.5.5.1.5.5 Autostart / Link Initialisation EIU-3774 GDI-2448:

The requirements related to the SpaceWire link aut ... Y I,R

EIU-3775 GDI-2518: A SpaceWire link interface shall start on command ...

Y T

3.5.5.1.5.6 Normal Operation EIU-3777 GDI-2519:

The requirements related to the SpaceWire link nor ... Y I,R

3.5.5.1.5.7 Error Detection EIU-3779 GDI-2520:

On exchange level, an on-board SpaceWire node shal ... Y T

EIU-3780 GDI-2524: The "exchange of silence" procedure - upon error d ...

Y I,R

EIU-3781 GDI-2522: The reporting of errors to the upper levels - pack ...

Y I,R

EIU-3782 GDI-2521: Errors that can affect the synchronisation on pack ...

Y I,R

3.5.5.1.5.8 Exception Conditions EIU-3784 GDI-2525:

The requirements related to the SpaceWire link exc ... Y I,R

3.5.5.1.5.9 Link Timing EIU-3786 GDI-2526:

The requirements related to the SpaceWire link tim ... Y I,R

3.5.5.1.5.10 Time Distribution 3.5.5.1.6 Packet Layer 3.5.5.1.6.1 SpaceWire Packet Composition EIU-3790 GDI-2536:

The SpaceWire packet format shall be in accordance ... Y I,R

EIU-3791 GDI-2499: Whichever SpaceWire supporting device is used, the ...

Y T,R

3.5.5.1.6.2 CCSDS Packet EIU-3793 GDI-2530:

For any on-board SpW node featuring CCSDS packetis ... Y I,R

3.5.5.1.6.3 Science Packet EIU-3795 GDI-2532:

For any on-board SpW node featuring science data p ... Y I,R

3.5.5.1.6.4 Maintenance of Synchronisation on SpaceWire Packet Level

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EIU-3797 GDI-2523: Any on-board SpaceWire node shall provide means to ...

Y T

3.5.5.1.6.5 Maintenance of Synchronisation on CCSDS Packet Level

EIU-3799 GDI-2534: Any on-board CCSDS-packetised SpaceWire node shall ...

Y T

3.5.5.1.7 Network Layer 3.5.5.1.7.1 Network Topology for GAIA SpaceWire

Implementation

EIU-3802 GDI-2535: Wherever n SpaceWire nodes (e.g., instruments or i ...

Y I,R

3.5.5.1.7.2 Implementation of Routing as per ECSS EIU-3804 GDI-2591:

Wherever SpaceWire routing is implemented inside a ... Y T

3.5.5.1.8 SpaceWire Standard Supporting Devices 3.5.5.1.8.1 SMCS & IEEE-1355 Standard EIU-3807 GDI-2442:

Any SpaceWire implementation of the existing Europ ... Y I,R

3.5.5.1.8.2 SMCS & SpaceWire EIU-3809 GDI-2441:

The European SMCS332SpW and SMCS116SpW shall be th ...

Y I,R

3.5.5.1.8.3 SpaceWire VHDL Core EIU-3811 GDI-2587:

In case of custom SpaceWire controllers implemente ... Y I,R

3.5.5.3 Standard Balanced Digital link (SBDL) EIU-3813 GDI-438:

The SBDL link interface is dedicated to serial dig ... Y T,R

EIU-3814 GDI-1201: The contractor shall design his side of the Standa ...

Y T,R

3.5.5.4 UART Serial Link (USL) EIU-3816 GDI-450:

The UART RS-422 serial link shall be composed of t ... Y R

EIU-3817 GDI-451: The UART RS-422 Serial Link Interface shall be imp ...

Y R

EIU-3818 GDI-452: The contractor shall design his part of the UART R ...

Y R

EIU-3819 GDI-453: Figure GDI-456 shows an example for data transmiss ...

Y R

EIU-3820 GDI-1274: The OBC shall be able to send commands on the Tran ...

Y T

EIU-3821 GDI-1275: No data repetition mechanism in both directions sh ...

Y T

EIU-3822 GDI-1276: Command messsages sent by the OBC to the user and ...

Y T

3.5.5.5.2 Synchronization Clock Interface (TBC) 3.5.5.6 Housekeeping Analog Acquisitions EIU-3825 GDI-471:

The interface shall consist of a differential link ... Y R

3.5.5.6.1 Analogue Telemetry Aquisition (AN1) EIU-3827 GDI-1205:

Analogue Telemetry Acquisition -5V to +5V Interfac ... Y T,R

3.5.5.6.2 Analogue Telemetry Aquisition (AN2)

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EIU-3829 GDI-1210: Analogue Telemetry Acquisition 0V to +5V Interface ...

Y T,R

3.5.5.6.3 Analogue Telemetry Aquisition (AN3) EIU-3831 GDI-1211:

Analogue Telemetry Acquisition -10V to +10V Interf ... Y T,R

3.5.5.7 Temperature Acquisitions (ANY, ANP, ANF, ANT) EIU-3833 GDI-482:

The signal shall be transmitted via twisted shield ... Y R

EIU-3834 GDI-483: The temperature aquisition interface circuitry, as ...

Y R

3.5.5.7.1 Thermistor Type1: YSI-44907/-44908 (ANY) EIU-3836 GDI-1215:

Temperature Acquisition Type 1: YSI 44907/YSI-4490 ... Y T,R

3.5.5.7.2 Thermistor Type2: PT-1000 (ANP) EIU-3838 GDI-487:

Temperature Acquisition Type 2: PT-1000 (ANP) Inte ... Y T,R

3.5.5.7.3 Thermistor Type3: Fenwell (ANF) EIU-3840 GDI-1216:

Temperature Acquisition Type 3: Fenwall (ANF) Inte ... Y T,R

3.5.5.7.4 Thermistor Type4: PT-200 (ANT) EIU-3842 GDI-2136:

Temperature Acquisition Type 4: PT-200 (ANT) Inter ... Y T,R

3.5.5.8 Relay Commands (SHP, EHP, SLP) EIU-3844 GDI-493:

The High Power On/Off Command source shall be refe ... Y R

EIU-3845 GDI-494: The High Power On/Off Command receiver shall be is ...

Y R

EIU-3846 GDI-495: The High Power On/Off Command receiver shall be eq ...

Y R

EIU-3847 GDI-496: The High Power On/Off Command source shall be shor ...

Y R

EIU-3848 GDI-1220: The Standard High Power On/Off Command interface s ...

Y R

3.5.5.8.1 Standard High Power On/Off Command (SHP) EIU-3850 GDI-497:

Standard High Power On/Off Command: The contractor ...

Y T,R

3.5.5.8.2 Extended High Power On/Off Command (EHP) EIU-3852 GDI-502:

Extended High Power On/Off Command: The contractor ...

Y T,R

3.5.5.8.3 Standard Low Power On/Off Commands (SLP) EIU-3854 GDI-509:

The Low Power On/Off Command source shall be refer ... Y R

EIU-3855 GDI-510: The Low Power On/Off Command receiver shall be iso ...

Y R

EIU-3856 GDI-511: The Low Power On/Off Command receiver shall be equ ...

Y R

EIU-3857 GDI-512: The Low Power On/Off Command source shall be short ...

Y R

EIU-3858 GDI-1252: Standard Low Power On/Off Command: The contractor ...

Y T,R

3.5.5.9 Relay Status Acquisitions (RSA)

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EIU-3860 GDI-1229: The open/closed status of a relay/switch contact ( ...

Y R

EIU-3861 GDI-516: Relay Status Acquisition The contractor shall desi ...

Y T,R

3.5.5.12 Digital Bi-Level TM Acquisitions (BLD) EIU-3863 GDI-523:

Each bi-level digital channel shall be used to acq ... Y R

EIU-3864 GDI-1232: The OBC shall acquire via the Bi-Level Digital Acq ...

Y R

EIU-3865 GDI-1233: Each channel shall be allocated to a specific bit ...

Y R

EIU-3866 GDI-524: Bi-level Digital Interface The contractor shall de ...

Y T,R

3.5.5.13 AOCS Interfaces 3.5.5.14 Propulsion Interfaces EIU-3869 GDI-1775:

The driver function shall implement an arming and ... Y T,R

EIU-3870 GDI-1776: The arming and firing commands shall be implemente ...

Y T,R

EIU-3871 GDI-1777: There shall be no failure propogation from the dri ...

Y A

EIU-3872 GDI-1778: The Driver shall implement free wheeling diodes in ...

Y T

3.5.5.14.1 Latch Valve Interfaces (LVC, LVS) EIU-3874 GDI-1287:

The Latch Valve Command outputs shall provide redu ... Y R

EIU-3875 GDI-1288: Each Latch Valve Command interface, main and redun ...

Y A

3.5.5.14.1.1 Latch Valve Commands (LVC) EIU-3877 GDI-1289:

The contractor shall design his part of the Latch ... Y T,R

3.5.5.14.1.2 Latch Valve Status Interface (LVS) 3.5.5.14.2 Flow Control Valve Interfaces (FCV) EIU-3880 GDI-1436:

The Flow Control Valve Command outputs shall provi ... Y R

EIU-3881 GDI-1437: The contractor shall design his part of the Flow C ...

Y T,R

3.5.5.14.3 Pressure Transducer Interface's (PTS, PTA) 3.5.5.14.3.1 Pressure Transducer Acquisition Interface

(PTA)

EIU-3884 GDI-1590: Internal test acquisitions shall be provided to al ...

Y R

EIU-3885 GDI-1591: Pressure Transducer Acquisition Interface (PTA): T ...

Y T

3.5.6 Electrical Interface Control Document EIU-3887 GDI-558:

Interfaces will be formally controlled within the ... Y R

3.5.7 EMC Requirements EIU-3889 GDI-2154:

In order to achieve compliance with the requiremen ... Y A,R

3.5.7.1 Bonding

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EIU-3891 GDI-562: The bond shall be resistant against corrosion and ...

Y R

EIU-3892 GDI-563: Metallic parts of each electrical equipment chassi ...

Y T

EIU-3893 GDI-564: Joint faces shall be flat and clean before assembl ...

Y I,R

EIU-3894 GDI-565: All non-electrical equipment shall be bonded to th ...

Y T

EIU-3895 GDI-566: Each electrical equipment chassis (case) shall be ...

Y T,R

EIU-3896 GDI-567: Metallic receptacles of connectors shall be electr ...

Y T

3.5.7.1.1 Ground Reference Rail EIU-3898 GDI-569:

Electrical bonding throughout CFRP structure shall ... Y R

EIU-3899 GDI-2715: the GRR shall be attahced at less than or equal to ...

Y R

EIU-3900 GDI-570: The resistance between any adjacent parts of the G ...

Y T,R

EIU-3901 GDI-571: The resistance between any two points of the GRR s ...

Y T,R

3.5.7.1.2 Cable and Harness Shields EIU-3903 GDI-573:

Where shielded wires are used, the shield shall be ... Y R

EIU-3904 GDI-574: The maximum unshielded length of any shielded wire ...

Y R

EIU-3905 GDI-575: Daisy chaining of shield terminations shall be avo ...

Y R

EIU-3906 GDI-576: Shields shall not be used as an intentional curren ...

Y R

3.5.7.1.3 Structure Parts EIU-3908 GDI-578:

Conductive structure components shall be electrica ... Y I,R

EIU-3909 GDI-1990: The DC resistance between two mating metal strutur ...

Y T,R

EIU-3910 GDI-1991: Across moveable parts, a bond strap shall be appli ...

Y T,R

EIU-3911 GDI-1992: For CFRP structure without shielding function, the ...

Y T,R

EIU-3912 GDI-2093: This Requirement has been Deleted. ...

Y

EIU-3913 GDI-2092: For CFRP structure used for electromagnetic shield ...

Y T,R

EIU-3914 GDI-1989: Metal fittings shall be bonded to the structure wi ...

Y T,R

EIU-3915 GDI-579: Metal fittings shall be bonded to CFRP with a DC r ...

Y T,R

EIU-3916 GDI-2105: The DC resistance from any metal structure part an ...

Y T,R

EIU-3917 GDI-2094: The DC resistance between any other conductive com ...

Y T,R

EIU-3918 GDI-1993: The GRR shall be attached at less than or equal to ...

Y T,R

3.5.7.1.4 Mechanical Parts

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EIU-3920 GDI-581: Mechanical Parts without electrical nor shielding ...

Y T,R

EIU-3921 GDI-582: Mechanical Parts used for electromagnetic shieldin ...

Y T,R

3.5.7.2 Grounding and Isolation 3.5.7.2.1 General EIU-3924 GDI-585:

Each unit shall provide a grounding point, which i ... Y I

EIU-3925 GDI-586: CFRP and SiC shall not be used as an electrical bo ...

Y R

3.5.7.2.2 Electrical and Electronic Unit Requirement EIU-3927 GDI-588:

The structure of electrical and electronic unit sh ... Y T

EIU-3928 GDI-589: Openings for drainage, ventilation, etc... shall n ...

Y I

EIU-3929 GDI-590: All units shall have a M4 bonding stud ...

Y I

EIU-3930 GDI-591: The design of this bonding stud shall allow the co ...

Y I

3.5.7.2.3 Insulating materials EIU-3932 GDI-593:

Space exposed insulating material having a bulk re ... Y R

3.5.7.3 Primary and Secondary Power Lines 3.5.7.3.1 Primary Power Lines EIU-3935 GDI-605:

Isolation: Within all units the primary power buse ... Y R

EIU-3936 GDI-606: Isolation: All units (except PCDU) shall maintain ...

Y T,R

3.5.7.3.2 Secondary Power Lines EIU-3938 GDI-609:

Grounding: All secondary supplies, inside a unit, ... Y I,R

EIU-3939 GDI-1988: Equipment with its own dedicated DC - DC converter ...

Y T

EIU-3940 GDI-610: Isolation: prior to connection of the unit interna ...

Y T,R

EIU-3941 GDI-2106: After grounding, the impedance between the unit se ...

Y T,R

EIU-3942 GDI-611: Secondaries distributed between units (1 supplier; ...

Y R

EIU-3943 GDI-612: Secondaries distributed between units (1 supplier; ...

Y R

EIU-3944 GDI-614: Grounding diagram including zero volts interconnec ...

Y I

EIU-3945 GDI-615: The symbols in Figure GDI-2107 below shall be used ...

Y R

3.5.7.3.3 Signal Interfaces EIU-3947 GDI-617:

Signal circuits interfacing between Satellite equi ... Y R

EIU-3948 GDI-618: Where single-ended signal transmitters are used, i ...

Y R

EIU-3949 GDI-619: The use of common signal return paths is only perm ...

Y R

3.5.7.3.4 EGSE Grounding and Isolation

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EIU-3951 GDI-621: EGSE signal and power circuits interfacing with fl ...

Y R

3.5.7.4 Magnetic Moment EIU-3953 GDI-1997:

Each equipment shall be designed and fabricated to ... Y T,R

EIU-3954 GDI-1998: Deleted. ...

Y T

3.6 Operations Design and Interface Requirements 3.6.1 Bit / Byte Numbering Convention EIU-3957 GDI-632:

In all project specific documentation including co ... Y T,R

EIU-3958 GDI-634: During file transfer, within any data type structu ...

Y T,R

3.6.2 Operational Functions 3.6.2.1 Handling of Operational Configuration, Modes and

States

EIU-3961 GDI-638: Mode/State transitions: Transitions from one mode/ ...

Y R

EIU-3962 GDI-639: The unit supplier shall identify appropriate modes ...

Y R

EIU-3963 GDI-640: At all times, equipment and units shall be in a cl ...

Y T,R

EIU-3964 GDI-641: In addition, modes and the mode transitions manage ...

Y T,R

EIU-3965 GDI-642: The unit supplier shall identify all internal and ...

Y R

EIU-3966 GDI-643: The unit supplier shall identify all transition ti ...

Y R

EIU-3967 GDI-644: Mode/State transitions with duration longer than 1 ...

Y R

EIU-3968 GDI-645: It shall be possible to command the unit into each ...

Y T,R

3.6.2.2 Commandability 3.6.2.2.1 General EIU-3971 GDI-648:

Commandability is characterised by the set of comm ... Y T

EIU-3972 GDI-649: In operating states of the unit, it shall be possi ...

Y T

EIU-3973 GDI-650: In addition, in non-operating states of the unit, ...

Y T

EIU-3974 GDI-651: Individual switching of switchable elements (e.g. ...

Y T

EIU-3975 GDI-652: The on-board reception, processing and execution o ...

Y T,R

EIU-3976 GDI-653: The function of a command shall not change through ...

Y T,R

EIU-3977 GDI-654: A single command may be used to initialise a chang ...

Y T,R

EIU-3978 GDI-655: Commands with variable bit-fields meaning shall no ...

Y R

EIU-3979 GDI-656: Nominal and the redundant functions or equipments ...

Y T

EIU-3980 GDI-657: The unit design shall avoid any conflict between a ...

Y T

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3.6.2.3 Observability 3.6.2.3.1 General EIU-3983 GDI-660:

Observability is characterised by the set of telem ... Y R

EIU-3984 GDI-661: The unit shall provide in its housekeeping telemet ...

Y T,R

EIU-3985 GDI-662: The unit shall provide the necessary instrumentati ...

Y T,R

EIU-3986 GDI-663: Telemetry measurement sensors shall be designed su ...

Y T

EIU-3987 GDI-664: It shall be possible to determine the status of th ...

Y T

EIU-3988 GDI-665: Essential (high-priority) telemetry data enabling ...

Y T,R

EIU-3989 GDI-666: Telemetry shall always be provided to identify una ...

Y T,R

EIU-3990 GDI-667: Status information in telemetry shall be provided ...

Y T,R

EIU-3991 GDI-668: Any TM processing required at a higher operational ...

Y R

EIU-3992 GDI-669: Telemetry shall always be available to determine t ...

Y R

EIU-3993 GDI-670: When a key parameter is derived on-board from seve ...

Y T,R

3.6.2.3.2 Telemetry Acquisition EIU-3995 GDI-672:

The TM acquisition process by the data bus shall n ... Y T

EIU-3996 GDI-673: The unit design shall avoid any conflict between t ...

Y T

EIU-3997 GDI-674: TM acquisitions with conditional meaning shall not ...

Y R

EIU-3998 GDI-675: The value of a telemetry parameter shall be transm ...

Y R

EIU-3999 GDI-676: Analog TM Acquisition: Analog TM acquisitions sha ...

Y T,R

EIU-4000 GDI-677: Acquisition of safety critical analog parameters o ...

Y R

EIU-4001 GDI-678: The values of currents or voltages readings shall ...

Y R

EIU-4002 GDI-679: The calibration curve of an analog parameter shall ...

Y R

3.6.2.3.3 Observability of Hardware Configuration EIU-4004 GDI-681:

At switch on, the configuration of the unit at ele ... Y T

EIU-4005 GDI-682: In case a unit includes several elementary functio ...

Y R

EIU-4006 GDI-683: The configuration of any on-board device and any s ...

Y T,R

EIU-4007 GDI-684: Any configuration command register shall be observ ...

Y R

EIU-4008 GDI-685: The acquisition of the unit configuration/state sh ...

Y R

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EIU-4009 GDI-686: The acquisition of an ON/OFF status for a relay sh ...

Y R

EIU-4010 GDI-687: If the unit controls the redundancy configuration ...

Y T

EIU-4011 GDI-688: Nominal and redundant functions shall be observabl ...

Y R

3.6.2.3.4 Observability of Commands EIU-4013 GDI-690:

Commands to the unit shall be acknowledged in an u ... Y R

EIU-4014 GDI-691: Acknowledgement of commands shall be direct (i.e. ...

Y T,R

EIU-4015 GDI-692: The association between command acknowledgement ac ...

Y I

EIU-4016 GDI-693: Successful execution of a command to the unit shal ...

Y T,R

EIU-4017 GDI-694: Failures in the acceptance and /or the execution o ...

Y T,R

3.6.2.3.5 Converters Observability EIU-4019 GDI-696:

Sufficient data to monitor the converters shall be ... Y T

3.6.2.4 Safety Critical and Hazardous Functions EIU-4021 GDI-700:

All critical commands shall be identified at equip ... Y A

EIU-4022 GDI-701: The execution of any unit command or command seque ...

Y A

EIU-4023 GDI-702: Commanding of critical commands shall be implement ...

Y A,R

EIU-4024 GDI-703: The status of inhibition of safety critical functi ...

Y T

EIU-4025 GDI-704: Units shall provide an unambiguous health status o ...

Y T

3.6.2.5 Handling of Memories EIU-4027 GDI-706:

Any part of installed RAM’s shall be readable by m ... Y T

EIU-4028 GDI-707: Any part of installed RAM’s shall be overwriteable ...

Y T

EIU-4029 GDI-708: Any part of installed ROM’s shall be readable by m ...

Y T

EIU-4030 GDI-709: For failure investigation, it shall be possible to ...

Y T

3.6.2.6 Autonomy EIU-4032 GDI-711:

Apart from failure situations, the unit shall oper ... Y T

EIU-4033 GDI-712: All parameters used for autonomous operations and ...

Y T

3.6.2.7 Automatic Functions EIU-4035 GDI-714:

It shall be possible to inhibit and to override al ... Y T

EIU-4036 GDI-715: All actions generated by automatic on-board logic ...

Y T

EIU-4037 GDI-716: The automatic function design shall be such that n ...

Y A,R

EIU-4038 GDI-717: Telemetry shall be associated to all automatic fun ...

Y T

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EIU-4039 GDI-718: For all the automatic logic using several criteria ...

Y T

EIU-4040 GDI-719: The capability to change all on board logic (hardw ...

Y T,R

3.6.2.8 Time Synchronisation EIU-4042 GDI-721:

If the unit has operationally not been synchronise ... Y R

EIU-4043 GDI-722: If the unit has the function, all information on h ...

Y R

EIU-4044 GDI-723: Timing information provided in Housekeeping teleme ...

Y T,R

3.6.2.9 Fault Management / FDIR 3.6.2.9.1 Unit Fault Protection EIU-4047 GDI-726:

Any unit shall be able to withstand (i.e. remain i ... Y T,R

EIU-4048 GDI-727: Any unit shall be able to withstand (i.e. remain i ...

Y T,R

EIU-4049 GDI-728: It shall be possible to repeat any command several ...

Y T,R

3.6.2.9.2 Unit Self Tests EIU-4051 GDI-730:

All units that perform regular self-tests shall re ... Y R

3.6.2.9.3 Failure Detection, Isolation and Recovery (FDIR) Functions

EIU-4053 GDI-733: FDIR functions shall be implemented in a hierarchi ...

Y A,R

EIU-4054 GDI-734: The unit shall automatically detect any failure, w ...

Y T,R

EIU-4055 GDI-735: At unit level failures shall be detectable by adeq ...

Y A

EIU-4056 GDI-736: Failure detection algorithms shall report in event ...

Y A,R

EIU-4057 GDI-737: Failures which require a reaction time less than 1 ...

Y T,A

EIU-4058 GDI-738: Failure which requires a reaction time between 10s ...

Y A,R

EIU-4059 GDI-739: Failure isolation shall be performed at switchable ...

Y T,A

EIU-4060 GDI-740: Any FDIR actions on unit level shall be reported t ...

Y T,R

EIU-4061 GDI-741: The need for intervention of higher levels to reac ...

Y T,A,R

3.6.3 Other Requirements 3.6.3.1 Inputs to Design Justification File EIU-4064 GDI-744:

The unit supplier shall provide a design justifica ... Y R

3.6.3.2 Inputs to Operational Database EIU-4066 GDI-746:

The unit supplier shall provide inputs to the Oper ... Y R

EIU-4067 GDI-747: Data to be provided (the list is not exhaustive): ...

Y R

3.6.3.3 Operation Manual

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EIU-4069 GDI-749: The unit supplier shall provide an Operations Manu ...

Y R

EIU-4070 GDI-750: The following standardization (Table GDI-751) shal ...

Y R

3.7 Software Design & Interface Requirements 3.7.1 General EIU-4073 GDI-2181:

All sotfware production and test shall follow the ... Y R

EIU-4074 GDI-2182: All on-board software running in sub-systems shall ...

Y R

EIU-4075 GDI-2183: The on-board software shall be developed using a h ...

Y R

EIU-4076 GDI-2184: The use of a non high-level language code (e.g., a ...

Y A

EIU-4077 GDI-2185: The on-board sotware shall be implemented with a l ...

Y R

3.7.2 Flight Processor Resource Sizing EIU-4079 GDI-2192:

During development, flight processors providing co ... Y T,A

EIU-4080 GDI-2193: Any on-board software shall provide the capability ...

Y T,R

EIU-4081 GDI-2194: The resource utilisation monitor shall be availabl ...

Y T,R

EIU-4082 GDI-2196: Sizing of the software resources shall be done in ...

Y T,A

3.7.3 Robustness 3.7.3.1 Infinite Loops EIU-4085 GDI-2197:

The on-board software shall protect itself against ... Y T,I

EIU-4086 GDI-2218: Whenever possibility of Warm Restart is implemente ...

Y T,I

3.7.3.2 Overload EIU-4088 GDI-2198:

Any on-board software product shall provide a tabl ... Y T,I

EIU-4089 GDI-2199: If and only if the overload situation cannot be ab ...

Y T,I

3.7.4 Events EIU-4091 GDI-2214:

The on-board software shall provide a means to fil ... Y T,I

EIU-4092 GDI-2215: The on-board software shall maintain counters for: ...

Y T,I

3.7.5 Initialisation EIU-4094 GDI-2226:

Any on-board unit embedding software shall provide ... Y T,R

EIU-4095 GDI-2228: The Cold Restart shall start execution from a hard ...

Y T

EIU-4096 GDI-2229: The Warm Restart shall start from a software comma ...

Y T

EIU-4097 GDI-2230: The Warm Restart shall perform a processor reset a ...

Y T,I

EIU-4098 GDI-2227: The Cold Restart and the Warm Restart initialisati ...

Y T

EIU-4099 GDI-2234: At a predictible stage of the initialisation, the ...

Y

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3.7.6 Testability EIU-4101 GDI-2205:

Any on-board unit embedding software shall provide ... Y T,R

3.7.7 SW Maintainability 3.7.7.1 Version Number EIU-4104 GDI-2209:

All software products shall store their version nu ... Y T

EIU-4105 GDI-2212: The flight software version number shall be retrie ...

Y T

EIU-4106 GDI-2208: The flight software version number shall be modifi ...

Y T

3.7.7.2 In Flight SW Modification EIU-4108 GDI-2186:

Any on-board unit embedding software shall support ... Y T

EIU-4109 GDI-2187: The on-board software shall be structured such tha ...

Y I

EIU-4110 GDI-2231: Any on-board unit embedding software shall support ...

Y T

EIU-4111 GDI-2232: Any on-board unit embedding software shall support ...

Y T

EIU-4112 GDI-2201: Any on-board unit embedding software shall be repr ...

Y T

3.7.7.3 Ease of SW Operations & Modifications EIU-4114 GDI-2206:

Wherever possible, the software shall be table-dri ... Y I

EIU-4115 GDI-2210: All on-board software data that are anticipated to ...

Y I

EIU-4116 GDI-2211: The on-board software shall have knowledge of the ...

Y T

EIU-4117 GDI-2207: Software-implemented limits and triggers for anoma ...

Y T,I

3.7.8 SafeGuard Memory (SGM) Maintainability EIU-4119 GDI-2223:

In case of Cold Restart, any on-board unit embeddi ... Y R

EIU-4120 GDI-2224: The on-board software shall implement SGM data str ...

Y T,I

3.7.9 Independent SW Verification & Validation (ISVV) EIU-4122 GDI-2188:

The software components that are critical for the ... Y A

3.7.10 SW Maintenance Products EIU-4124 GDI-2189:

All on-board software, including new and reused SW ... Y T,I

EIU-4125 GDI-2190: All on-board software executed in ASIC, FPGA, or o ...

Y T,I

EIU-4126 GDI-2233: The SW maintenance environment shall provide the m ...

Y T,I

EIU-4127 GDI-2235: All software licenses for any software used to dev ...

Y I

EIU-4128 GDI-2236: For any on-board unit embedding software, a softwa ...

Y T,I

EIU-4129 GDI-2237: The software development and maintenance facility ...

Y T,I

4 Environment Design Requirements

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EIU-4131 GDI-2315: All component of the spacecraft shall be designed ...

Y A

4.1 Ground operation phase EIU-4133 GDI-2318:

To allow validation and integration operations, al ... Y A,R

4.1.1 Thermal and climatic environment EIU-4135 GDI-2320:

For AIV and storage, the climatic conditions shall ... Y T,A

EIU-4136 GDI-2321: Assembly, integration and verification of flight h ...

Y I

EIU-4137 GDI-2322: During transport prior to integration on the space ...

Y I

EIU-4138 GDI-2323: The flight hardware transportation containers shal ...

Y T,A

4.1.2 Mechanical environment EIU-4140 GDI-790:

The equipment/assembly and associated transport co ... Y T,A

EIU-4141 GDI-793: During ground transportation the equipments shall ...

Y T,A

EIU-4142 GDI-2327: All MGSE, containers, transportation and handling ...

Y T,A

EIU-4143 GDI-2328: Sine and random vibrations: the unit transport con ...

Y T,A

EIU-4144 GDI-2329: For containers, the shock requirement is a drop of ...

Y T

EIU-4145 GDI-2663: Fatigue loads : in case of a launch from Baikonur, ...

Y A

4.2 Launch and Early Operation phase 4.2.1 Pressure Environment EIU-4148 GDI-780:

Units mounted on the S/C shall be designed to with ... Y T

4.2.2 Contamination EIU-4150 GDI-782:

Cleanliness requirements are as defined in the PA ... Y T,R

4.2.3 Mechanical environment 4.2.3.1 Quasi static and low frequency loads EIU-4153 GDI-799:

The quasi-static and low frequency flight limit ac ... Y T,A

4.2.3.2 Dynamic Environment 4.2.3.2.1 Sinusoidal Environment EIU-4156 GDI-808:

All units mounted on the SCM structure shall be de ... Y T,A

4.2.3.2.2 Random Environment EIU-4158 GDI-812:

Units shall be designed and tested to withstand, ... Y T,A

4.2.3.2.3 Acoustic environment EIU-4160 GDI-2338:

Units shall be designed and tested to withstand, ... Y T,A

4.2.3.2.4 Shock Environment EIU-4162 GDI-818:

Units mounted on the S/C Structure shall be design ... Y T,A

4.2.4 Thermal environment EIU-4164 GDI-2602:

For units having a view factor to external space, ... Y T,A

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4.2.5 Electromagnetic and radio frequency environment 4.3 In orbit Environment 4.3.1 In orbit mechanical loads 4.3.1.1 Quasi-static & Thermo-elastic Loads EIU-4169 GDI-823:

During orbit and attitude correction manoeuvres, u ... Y T,A,R

EIU-4170 GDI-2131: The unit shall be compatible with internal loads g ...

Y A

4.3.1.2 Micro-vibrations EIU-4172 GDI-825:

Equipment generating micro-vibrations shall not be ... Y T,R

4.3.1.3 Dynamical distrurbances EIU-4174 GDI-2677:

In equipment operating mode, any potential equipme ... Y R

EIU-4175 GDI-2678: Once the equipment operational conditions have bee ...

Y I,R

4.3.2 In orbit thermal EIU-4177 GDI-841:

During the In Orbit phase, the spacecraft units TR ... Y A,R

EIU-4178 GDI-2583: During the In Orbit phase, the spacecraft units wi ...

Y T,A

EIU-4179 GDI-2878: The units listed in the above table shall consider ...

Y T,A

4.4 Radiation Environment 4.4.1 Introduction EIU-4182 GDI-847:

The radiation environment for the mission is shown ... Y A,R

4.4.2 GAIA Radiation Environment 4.4.2.1 Galactic Cosmic Ray (GCR) and Solar Energetic

Particle Environment

EIU-4185 GDI-1946: The integral LET spectra generated using CREME96 ( ...

Y R

4.4.2.2 Trapped Proton Environment during transfer 4.4.2.3 Solar Proton Environment on station 4.4.2.4 Trapped Electron Environment 4.4.3 Long Term Effect Considerations 4.4.3.1 Ionizing Dose Depth Curve EIU-4191 GDI-1966:

The radiation environment for the mission shall be ... Y A,R

4.4.3.2 Displacement Damage 4.4.4 Rules for Design and Performance EIU-4194 GDI-876:

No protective shielding by the outer panels of the ... Y R

EIU-4195 GDI-877: Unit shall take into account the shielding provide ...

Y A,R

4.4.5 Radiation Sensitive Components EIU-4197 GDI-1969:

The Subcontractor shall implement a Radiation Hard ... Y R

EIU-4198 GDI-1970: All parts shall be reviewed by the Subcontractor t ...

Y R

EIU-4199 GDI-1971: The Subcontractor shall issue a Radiation Assessme ...

Y R

4.4.5.1 Total Dose

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EIU-4201 GDI-1975: The total dose to be taken into account is defined ...

Y A,R

4.4.5.2 Single Event Effects (SEE) EIU-4203 GDI-1977:

Parts are considered SEE immune when the LETth is ... Y R

EIU-4204 GDI-1978: The component shall be designed to tolerate GCR, p ...

Y T,A,R

4.4.5.3 Single Event Latch-up EIU-4206 GDI-1980:

Devices which are known to be susceptible to latch ... Y A,R

4.4.5.4 Non Destructive Single Event (Single Event Upset, Single Event Transient...)

EIU-4208 GDI-1982: Part types shall be acceptable according to the ac ...

Y A,R

EIU-4209 GDI-2681: Memory circuits shall have sufficient error det ...

Y A,R

4.4.5.5 Single Event Burnout (SEB) and Single Event Gate Rupture (SEGR)

EIU-4211 GDI-1984: For SEB and SEGR, error rate prediction techniques ...

Y A,R

4.4.5.6 Displacement Damage EIU-4213 GDI-1986:

Parametric and functional sensitivity of an EEE pa ... Y R

EIU-4214 GDI-1987: The reset or data corruption occurrence rate due t ...

Y T,A,R

4.5 EMC Environment 4.5.1 EMC Performance Requirements 4.5.1.1 Inrush Current EIU-4218 GDI-895:

Inrush current at unit switch on shall not exceed ... Y T,A,R

4.5.1.2 Voltage Transients EIU-4220 GDI-897:

The transient on the primary power bus distributio ... Y T

EIU-4221 GDI-899: Conducted voltage transients on the primary power ...

Y T

4.5.1.3 Conducted Emissions on Regulated Power Bus 4.5.1.3.1 Conducted Emissions on Power Leads,

Frequency Domain

EIU-4224 GDI-902: Conducted narrow band current emissions (different ...

Y T,R

EIU-4225 GDI-904: Conducted narrow band current emissions (common mo ...

Y T,R

EIU-4226 GDI-2716: In case of internal redundancy, conducted emission ...

Y T

4.5.1.3.2 Conducted Emissions on Power Leads, Time Domain

EIU-4228 GDI-907: Time domain conducted differential mode voltage ri ...

Y T,R

EIU-4229 GDI-908: For Primary Power users, time domain conducted emi ...

Y T,R

EIU-4230 GDI-2709: Time domain current emissions shall be < 10% of th ...

Y T

EIU-4231 GDI-2717: In case of internal redundancy, time domain emissi ...

Y T

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4.5.1.4 Conducted Emissions on Secondary Power Lines 4.5.1.4.1 CE for Secondary Power Supply Units, Frequency

Domain

EIU-4234 GDI-918: The maximum voltage emission levels for secondary ...

Y T,R

4.5.1.4.2 CE for Secondary Power Supply Units, Time Domain

EIU-4236 GDI-920: The voltage ripple and spikes on secondary power s ...

Y T,R

4.5.1.5 Conducted Emissions Signal lines Common Mode EIU-4238 GDI-2711:

Conducted Narrow band conducted emissions (common ... Y T,R

EIU-4239 GDI-2712: Conducted Emission on Signal Bundle

Y T,R

4.5.2 Radiated Emissions - E field EIU-4241 GDI-922:

The unit shall not exceed the specified limits in ... Y T,R

EIU-4242 GDI-2704: On board Receiver Notch: 20 dBµV/M between 7190 an ...

Y T,R

4.5.3 Radiated Emissions - H field EIU-4244 GDI-926:

The radiated H field generated by Units, shall be ... Y T

4.5.4 Radiated Emissions Fluctuations - E Field EIU-4246 GDI-2013:

Any specific requirements on E-field will be detai ... Y R

4.5.5 Radiated Emissions Fluctuations - H Field EIU-4248 GDI-2022:

Any specific requirements on H-field will be detai ... Y R

4.5.6 Radiated Susceptibility - E field EIU-4250 GDI-928:

The unit shall not show any malfunction or deviati ... Y T,R

EIU-4251 GDI-2705: The unit shall not show any malfunction or deviati ...

Y T

EIU-4252 GDI-929: No unit that is powered On at launch shall show an ...

Y T,R

4.5.7 Radiated Susceptibility - H field EIU-4254 GDI-932:

Units shall not be susceptible when submitted to t ... Y T

4.5.8 Units linked by Secondary Power Lines EIU-4256 GDI-934:

When secondary lines power a unit, the unit shall ... Y T

EIU-4257 GDI-935: When a unit delivers secondary lines, the unit sha ...

Y T

4.5.9 Conducted Susceptibility Power Lines 4.5.9.1 Conducted Susceptibility Sine Wave - Differential

Mode

EIU-4260 GDI-938: Primary power bus powered units shall not exhibit ...

Y T,R

4.5.9.2 Conducted Susceptibility Sine Wave - Common Mode

EIU-4262 GDI-2000: Primary power bus powered units shall not exhibt a ...

Y T,R

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4.5.9.3 Conducted Susceptibility - Transient EIU-4264 GDI-2007:

The unit shall not exhibit any malfunctions, degra ... Y T

EIU-4265 GDI-2009: Transient Type 1 With reference to (figure GDI-941 ...

Y T

EIU-4266 GDI-2010: Transient Type 2 With reference to (figure GDI-941 ...

Y T

4.5.9.4 CE / CS on Interface signal lines EIU-4268 GDI-944:

No unit shall exhibit any malfunction, degradation ... Y T

EIU-4269 GDI-2089: The unit shall not exhibit any malfunction, degrad ...

Y T

4.5.10 Secondary Power Lines Susceptibility 4.5.10.1 CS Sinewave injection for secondary power

supply units

EIU-4272 GDI-949: The conducted susceptibility specification for sec ...

Y T,R

4.5.10.2 Requirement at subsystem or system level EIU-4274 GDI-951:

In addition, a margin of at least +6dB shall be de ... Y T,R

4.5.11 DC Magnetic Requirements EIU-4276 GDI-954:

Deleted. ... Y


Y

EIU-4278 GDI-958: The use of relays shall be limited to the most cri ...

Y R


Y

4.5.12 ESD Susceptibility EIU-4281 GDI-962:

The unit shall not be susceptible when submitted t ... Y T,R

4.5.13.1 Multipaction Discharge EIU-4283 GDI-2687:

All high power output equipment and components (> ... Y T

EIU-4284 GDI-2688: This shall be demonstrated up to 6dB above the pea ...

Y T,R

EIU-4285 GDI-2689: All power levels between 10 W (or a minimum signif ...

Y T

EIU-4286 GDI-2690: All multipaction tests shall be performed in the p ...

Y T,R

4.5.13.2 Corona Gas Discharge EIU-4288 GDI-2693:

Equipments and sub-systems shall be free from gas ... Y A

EIU-4289 GDI-2694: Adequate venting shall be provided to ensure that ...

Y A,I

EIU-4290 GDI-2695: If the above requirements GDI-2693 and GDI-2694 ca ...

Y T,A

4.5.14 Micrometeoroid environement EIU-4292 GDI-2683:

The micrometeoroid environment for the mission sha ... Y R

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EIU-4293 GDI-2686: A damage assessment based on the micrometeoroid en ...

Y A,R

5 Unit Level Test Requirements 5.1 General 5.1.1 Test Definition 5.1.1.1 Qualification tests EIU-4298 GDI-967:

Qualification of the design shall be accomplished ... Y T,A

5.1.1.2 Acceptance Tests EIU-4300 GDI-969:

Environmental acceptance testing shall be performe ... Y T,A,R

5.1.1.3 Functional Performance Tests EIU-4302 GDI-971:

The objective of the test item functional performa ... Y T,A

5.1.2 Test Facilities RequirementsY EIU-4304 GDI-973:

Any test facility to be used within the instrument ... Y A,R

5.1.2.1 Accuracy of Test Instrumentation EIU-4306 GDI-975:

The accuracy of instrument and test equipment used ... Y A,R

5.1.2.2 Tolerances of Test Parameters EIU-4308 GDI-977:

The allowed test condition tolerances shall be app ... Y A,I,R

5.1.2.3 Facility Ambient Condition EIU-4310 GDI-981:

Unless otherwise specified herein, all measurement ... Y A,I,R

5.1.3 Test Execution EIU-4312 GDI-983:

Test execution shall be started only if all starti ... Y A,I,R

5.1.4 Success Criteria EIU-4314 GDI-985:

The test is successfully performed if all measurem ... Y T,A

5.2 Unit Tests EIU-4316 GDI-2679:

The qualification and acceptance tests to be perfo ... Y T,A

5.2.1 Mechanical Environment Tests 5.2.1.1 Vibration Test Set Up EIU-4319 GDI-989:

The unit under test shall be mounted (to a rigid f ... Y T

EIU-4320 GDI-990: At least one triaxial sensor shall be mounted on t ...

Y T

EIU-4321 GDI-991: At least two axis aligned sensors shall be mounted ...

Y T

EIU-4322 GDI-992: All units powered on during launch shall be powere ...

Y T

5.2.1.2 Test Fixture EIU-4324 GDI-995:

The test item shall be attached to the vibration e ... Y T

EIU-4325 GDI-996: The variation of transmissibility between test ite ...

Y T

EIU-4326 GDI-997: Adequate fixture design and specimen installation ...

Y T

EIU-4327 GDI-998: A pre-test of the empty fixture shall be performed ...

Y T

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5.2.1.3 Frequency Search EIU-4329 GDI-1000:

Frequency search tests shall be conducted in order ... Y T

EIU-4330 GDI-1002: Frequency search tests shall be conducted along ea ...

Y T

5.2.1.4 Vibration Tests Level EIU-4332 GDI-1005:

For units the vibration test levels that are appli ... Y A,R

5.2.1.5 Sine And Random Vibration Test EIU-4334 GDI-1011:

Sine and random vibration tests shall be performed ... Y T

EIU-4335 GDI-1012: Prior and after sine and random vibration qualific ...

Y T

EIU-4336 GDI-1013: Before applying full levels, a test at intermediat ...

Y T

EIU-4337 GDI-1015: The vibration facility shall include a shock free ...

Y T

5.2.1.6 Shock Tests EIU-4339 GDI-1017:

Units shall demonstrate by test their ability to w ... Y T

EIU-4340 GDI-1018: Prior and after shock tests a low level sine frequ ...

Y T

5.2.1.7 Static tests EIU-4342 GDI-1020:

Static tests shall be performed by applying the sp ... Y T

5.2.2 Units Thermal Environment Tests 5.2.2.1 Thermal Test Setup EIU-4345 GDI-1024:

The temperatures shall be selected and controlled ... Y R

EIU-4346 GDI-1025: The test arrangement shall be as shown in Figure G ...

Y R

EIU-4347 GDI-1026: The unit shall be bolted to a thermally controlled ...

Y R

EIU-4348 GDI-1027: On all external surfaces flight representative the ...

Y R

EIU-4349 GDI-1028: The heat sink (HS) plates shall be black painted ( ...

Y R

EIU-4350 GDI-1029: The conductive heat sink temperature and the chamb ...

Y R

EIU-4351 GDI-1030: For vacuum tests the pressure inside the chamber s ...

Y R

5.2.2.2 Thermal Test Sequences 5.2.2.2.1 Qualification Thermal Vacuum EIU-4354 GDI-1034:

Unit’s suppliers shall perform Thermal Vacuum (TV) ... Y T

EIU-4355 GDI-1036: The TV test on unit level shall be performed as in ...

Y R

EIU-4356 GDI-1037: The qualification temperatures for the different u ...

Y R

EIU-4357 GDI-1038: The units shall be tested following the thermal va ...

Y T,R

5.2.2.2.2 Acceptance Thermal Vacuum EIU-4359 GDI-1044:

Unit suppliers shall perform thermal vacuum (TV) a ... Y T

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EIU-4360 GDI-1045: The thermal vacuum acceptance test shall be perfor ...

Y T,R

5.2.2.2.3 Protoflight Thermal Vacuum EIU-4362 GDI-1049:

Unit suppliers shall perform thermal vacuum (TV) p ... Y T

EIU-4363 GDI-1050: The thermal vacuum protoflight test shall be perfo ...

Y T,R

5.2.3 Electromagnetic Compatibility Tests 5.2.3.1 General EMC Test Requirements 5.2.3.1.1 EMC Development Test EIU-4367 GDI-1057:

Development tests may be performed to evaluate the ... Y T,R

5.2.3.1.2 EMC Qualification Test EIU-4369 GDI-1059:

Qualification tests for PFM shall be performed as ... Y T,R

5.2.3.1.3 EMC Acceptance Test EIU-4371 GDI-1061:

Acceptance tests for FM shall be performed as spec ... Y T,R

5.2.3.1.4 EMC Integration Test EIU-4373 GDI-1063:

In order to ensure the proper grounding of the sec ... Y T,R

5.2.3.1.5 Retest Criteria EIU-4375 GDI-1065:

A retest may be required in case a test result is ... Y R

5.2.3.1.6 Pre and Post Test Inspection EIU-4377 GDI-1067:

The pre- and post-test inspection is specified in ... Y R

5.2.3.1.7 Test Sequence EIU-4379 GDI-2155:

The actual EMC test sequence shall be agreed with ... Y R

5.2.3.2 Test Facility 5.2.3.2.1 EMC Test Environment EIU-4382 GDI-1072:

All EMC tests shall be conducted at standard ambie ... Y R

5.2.3.2.2 Capabilities EIU-4384 GDI-1074:

The test facilities used for the EMC test program ... Y R

5.2.3.3 Test Instrumentation 5.2.3.3.1 General Tolerances and Test Parameters EIU-4387 GDI-1077:

The maximum allowable tolerance for the test param ... Y R

5.2.3.3.2 Accuracy of the Test Measurement Equipment EIU-4389 GDI-1079:

The accuracy of measurement equipment and test equ ... Y R

5.2.3.3.3 Special Requirements on the Test Equipment EIU-4391 GDI-1081:

Grounding of Test Equipment: Measurement equipment ...

Y R

EIU-4392 GDI-1082: Antenna Placement: For radiated emission measureme ...

Y R

EIU-4393 GDI-1083: Receiver Bandwidth: The following receiver bandwid ...

Y R

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EIU-4394 GDI-1085: Power Adjustment: The primary power for unit level ...

Y R

5.2.3.3.4 Line Impedance Stabilisation Network (LISN): EIU-4396 GDI-1087:

For the conducted emission and susceptibility test ... Y R

EIU-4397 GDI-1090: The LISN has to be designed and provided by the co ...

Y T

EIU-4398 GDI-2116: Derivation of the bus impedance shall be performae ...

Y T

5.2.3.3.5 Test Conditions EIU-4400 GDI-1095:

The equipment under test shall be switched on in t ... Y R

EIU-4401 GDI-1096: For emission testing the unit shall operate within ...

Y R

EIU-4402 GDI-1097: For susceptibility testing the suitable operationa ...

Y R

EIU-4403 GDI-1098: After testing the equipment shall be switched off ...

Y R

EIU-4404 GDI-1099: Both operational modes shall provide operational c ...

Y R

EIU-4405 GDI-1100: The particular test set-up shall represent the fli ...

Y R

5.2.3.3.6 Susceptibility Testing EIU-4407 GDI-2142:

The applicable pass/fail criteria for susceptibili ... Y R

EIU-4408 GDI-1103: Data Acquisition: The item under test shall be mon ...

Y T

5.2.3.4 Specific EMC Test Requirement 5.2.3.4.1 Electrical Bonding EIU-4411 GDI-1107:

The bonding test shall be performed with the unit ... Y R

EIU-4412 GDI-1108: The bonding test shall be performed without any ha ...

Y R

5.2.3.4.2 Isolation EIU-4414 GDI-1111:

The isolation test shall be performed with the UUT ... Y R

5.2.3.4.3 Conducted Emissions on Power Lines 5.2.3.4.3.1 CE on Primary Power Lines EIU-4417 GDI-1116:

UUT operation shall be selected in order to maximi ... Y R

EIU-4418 GDI-1118: Ripple and transient interference tests on the pow ...

Y R

5.2.3.4.3.2 CE on Secondary Power Lines EIU-4420 GDI-1123:


EIU-4421 GDI-1124: When the secondary power provider and user need to ...

Y R

5.2.3.4.4 Conducted Susceptibility, Signal Harnesses, Bulk Current Injection

EIU-4423 GDI-2090: The mode selection for susceptibility testing shal ...

Y T,R

5.2.3.4.5 Conducted Susceptibility on Power Lines

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Y R

EIU-4426 GDI-1134: The test set-ups are shown in Figure GDI-1135 (CS0 ...

Y T

5.2.3.4.6 Conducted Susceptibility on Secondary Power Lines


Y R

EIU-4429 GDI-1141: The test set-ups are shown in Figure GDI-1142 (CS0 ...

Y T

5.2.3.4.7 Radiated Emission, Electric Field EIU-4431 GDI-1151:


5.2.3.4.8 Radiated Emissions, E-Field Fluctuations 5.2.3.4.9 Radiated Emission, Magnetic Field EIU-4434 GDI-1155:


5.2.3.4.10 Radiated Emissions, Magnetic Field Fluctuations

5.2.3.4.11 Radiated Susceptibility, Electric Field EIU-4437 GDI-1159:


5.2.3.4.12 Radiated Susceptibility, Magnetic Field EIU-4439 GDI-1163:


5.2.3.4.13 Electrostatic Discharge (ESD) EIU-4441 GDI-1167:


5.2.3.4.14 Magnetic Moment EIU-4443 GDI-1173:

Verification by similarity may be applied to equip ... Y A,R

5.2.4 Life Test EIU-4445 GDI-1185:

A life test shall be required for all the assembli ... Y T,R

5.2.5 Space Conditioning EIU-4447 GDI-1187:

Space conditioning shall be performed whenever des ... Y T,R

EIU-4448 GDI-1188: The contractors shall propose the corresponding te ...

Y R

EIU-4449 GDI-1189: For example, but without limitation to, materials ...

Y T

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9 ABBREVIATIONS LIST

AIT Assembly, Integration & Test

AOCS Attitude Orbit Control System

CSW Central Software

BAT Battery

CDMU Control and Data Management Unit

CLK Clock

CLTU Command Line Transimssion Unit

EPS Electrical Power System

EHP Extended High Priority (ON/OFF)

FEEP Field Effect Electric Propulsion

FPA Focal Plane Assembly

FDIR Failure Detection Isolation and Recovery

FSS Fine Sun Sensor

HK Housekeeping

HPC High Priority Command (ON/OFF)

HTR Heater

LCL Latching current limiter (EPS outlet)

LV Latch Valve

LVDS Low Voltage Differential Signalling

OOL Out Of Limit

PWR Power

RX Receiver

SC Spacecraft

SHP Standard High Power

SpW SpaceWire

SREM Spacecraft Radiation Environmental Monitor

SVT System Validation Test

SVM Service Module

TBC To Be Confirmed

TBD To Be Defined

TCS Thermal Control System

TX Transmitter

UART Universal Asynchronous Receiver Transmitter

VPU Video Processor Unit

WCA Worst Case Analysis

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Requirement/Section Cross Reference Page numbers are the pages where the sections start

EIU-131 ..............3.1 ...................10 EIU-137 ..............3.1 ...................10 EIU-138 ..............3.1 ...................10 EIU-139 ..............3.1 ...................10 EIU-140 ..............3.1 ...................10 EIU-147 ..............3.1 ...................10 EIU-154 ..............3.1 ...................10 EIU-169 ..............3.2.1 ................12 EIU-174 ..............3.2.2 ................12 EIU-177 ..............3.2.2 ................12 EIU-519 ..............3.3.1 ................12 EIU-521 ..............3.3.2 ................12 EIU-524 ..............3.3.3 ................13 EIU-549 ..............3.4.1 ................13 EIU-553 ..............3.4.1 ................13 EIU-572 ..............3.4.2.1 .............14 EIU-573 ..............3.4.2.1 .............14 EIU-576 ..............3.4.2.1 .............14 EIU-578 ..............3.4.2.2.1...........15 EIU-579 ..............3.4.2.2.2...........15 EIU-580 ..............3.4.2.2.2...........15 EIU-581 ..............3.4.2.2.1...........15 EIU-582 ..............3.4.2.2.3...........15 EIU-585 ..............3.4.2.2.3...........15 EIU-659 ..............3.1 ...................10 EIU-660 ..............3.2.2 ................12 EIU-661 ..............3.1 ...................10 EIU-662 ..............3.1 ...................10 EIU-665 ..............3.4.5.1 .............17 EIU-666 ..............3.4.5.1 .............17 EIU-674 ..............3.4.5.1 .............17 EIU-675 ..............3.4.5.1 .............17 EIU-678 ..............3.4.5.1 .............17 EIU-694 ..............3.4.5.2 .............18 EIU-700 ..............3.4.5.3.1...........19 EIU-701 ..............3.4.5.3.1...........19 EIU-702 ..............3.4.5.3.1...........19 EIU-706 ..............3.4.5.3.2...........19 EIU-707 ..............3.4.5.3.2...........19 EIU-713 ..............3.4.5.3.3...........20 EIU-715 ..............3.4.5.3.3...........20 EIU-716 ..............3.4.5.3.3...........20 EIU-723 ..............3.4.5.4 .............21 EIU-734 ..............3.4.5.5 .............21 EIU-735 ..............3.4.5.5 .............21 EIU-738 ..............3.4.5.6 .............22 EIU-739 ..............3.4.5.6 .............22 EIU-740 ..............3.4.5.6 .............22 EIU-754 ..............3.4.6.3 .............24 EIU-755 ..............3.4.6.3 .............24 EIU-756 ..............3.4.6.3 .............24 EIU-780 ..............3.4.3 ................16 EIU-782 ..............3.4.3 ................16 EIU-783 ..............3.4.3 ................16 EIU-797 ..............3.4.4 ................17 EIU-798 ..............3.4.4 ................17 EIU-799 ..............3.4.4 ................17

EIU-800 .............. 3.4.4 ................ 17 EIU-801 .............. 3.4.4 ................ 17 EIU-804 .............. 3.4.2.4 ............. 16 EIU-805 .............. 3.4.2.4 ............. 16 EIU-806 .............. 3.4.2.4 ............. 16 EIU-809 .............. 3.4.2.3 ............. 16 EIU-810 .............. 3.4.2.3 ............. 16 EIU-811 .............. 3.4.2.3 ............. 16 EIU-816 .............. 3.4.6.4.1 .......... 25 EIU-819 .............. 3.4.6.4.1 .......... 25 EIU-946 .............. 3.5.1.1 ............. 25 EIU-956 .............. 3.5.2.1 ............. 25 EIU-957 .............. 3.5.2.1 ............. 25 EIU-980 .............. 4.1.1 ................ 26 EIU-982 .............. 4.1.2 ................ 26 EIU-984 .............. 4.1.3 ................ 26 EIU-987 .............. 4.2.1 ................ 26 EIU-989 .............. 4.2.2 ................ 26 EIU-991 .............. 4.2.3 ................ 27 EIU-1017 ............ 3.4.6.3 ............. 24 EIU-1020 ............ 3.4.6.3 ............. 24 EIU-1023 ............ 3.4.6.3 ............. 24 EIU-1025 ............ 3.4.3 ................ 16 EIU-1026 ............ 3.4.3 ................ 16 EIU-1028 ............ 3.4.3 ................ 16 EIU-1032 ............ 3.4.3 ................ 16 EIU-1034 ............ 3.4.2.1 ............. 14 EIU-1172 ............ 4.3.3 ................ 30 EIU-1173 ............ 4.3.1 ................ 27 EIU-1208 ............ 3.4.5.3.3 .......... 20 EIU-1211 ............ 3.4.5.3.3 .......... 20 EIU-1282 ............ 5.1 ................... 31 EIU-1285 ............ 5.2.1 ................ 31 EIU-1289 ............ 5.2.2 ................ 31 EIU-1291 ............ 5.2.2 ................ 31 EIU-1293 ............ 5.2.3 ................ 31 EIU-1295 ............ 5.2.4 ................ 31 EIU-1296 ............ 5.2.4 ................ 31 EIU-1297 ............ 5.2.4 ................ 31 EIU-1298 ............ 5.2.4 ................ 31 EIU-1299 ............ 5.2.4 ................ 31 EIU-1304 ............ 5.2.4 ................ 31 EIU-1305 ............ 5.2.4 ................ 31 EIU-1314 ............ 6 ...................... 33 EIU-1315 ............ 6 ...................... 33 EIU-1318 ............ 7.1 ................... 34 EIU-1321 ............ 7.2.1 ................ 34 EIU-1322 ............ 7.2.1 ................ 34 EIU-2279 ............ 4.2.2 ................ 26 EIU-2280 ............ 4.2.2 ................ 26 EIU-2281 ............ 4.2.2 ................ 26 EIU-2283 ............ 4.2.2 ................ 26 EIU-2285 ............ 5.3 ................... 32 EIU-2290 ............ 3.4.6.2 ............. 22 EIU-2291 ............ 3.4.6.2 ............. 22 EIU-2292 ............ 3.4.6.2 ............. 22 EIU-2293 ............ 3.4.6.2 ............. 22

EIU-2294............ 3.4.6.2............. 22 EIU-2295............ 3.4.6.2............. 22 EIU-2296............ 3.4.6.2............. 22 EIU-2297............ 3.4.6.2............. 22 EIU-2298............ 3.4.6.2............. 22 EIU-2299............ 3.4.6.2............. 22 EIU-2300............ 3.4.6.2............. 22 EIU-2313............ 3.4.6.1............. 22 EIU-2314............ 3.4.6.1............. 22 EIU-2315............ 3.4.6.1............. 22 EIU-2317............ 3.4.6.1............. 22 EIU-2318............ 3.4.6.1............. 22 EIU-2319............ 3.4.6.1............. 22 EIU-2322............ 3.4.5.3.3.......... 20 EIU-2323............ 3.4.5.3.3.......... 20 EIU-2325............ 3.4.5.3.3.......... 20 EIU-2326............ 3.4.5.3.3.......... 20 EIU-2328............ 3.4.6.4.1.......... 25 EIU-2329............ 3.4.6.4.1.......... 25 EIU-2330............ 4.3.1................ 27 EIU-2331............ 4.3.1................ 27 EIU-2332............ 4.3.1................ 27 EIU-2334............ 4.3.1................ 27 EIU-2335............ 4.3.1................ 27 EIU-2336............ 4.3.1................ 27 EIU-2337............ 4.3.3................ 30 EIU-2338............ 4.3.1................ 27 EIU-3018............ 3.4.5.5............. 21 EIU-3019............ 3.4.5.5............. 21 EIU-3020............ 4.3.1................ 27 EIU-3024............ 4.3.2................ 29 EIU-3025............ 4.3.2................ 29 EIU-3026............ 4.3.2................ 29 EIU-3027............ 4.3.2................ 29 EIU-3028............ 4.3.2................ 29 EIU-3029............ 4.3.2................ 29 EIU-3341............ 3.4.2.1............. 14 EIU-3342............ 3.4.4................ 17 EIU-3343............ 3.4.2.4............. 16 EIU-3344............ 3.4.2.3............. 16 EIU-3354............ 4.3.3................ 30 EIU-3366............ 3.4.6.3............. 24 EIU-3367............ 3.4.6.3............. 24 EIU-3368............ 3.4.6.3............. 24 EIU-3372............ 3.2.2................ 12 EIU-3374............ 3.3.3................ 13 EIU-3375............ 3.3.3................ 13 EIU-3376............ 3.3.3................ 13 EIU-3378............ 3.3.3................ 13 EIU-3383............ 3.3.3................ 13 EIU-3384............ 3.4.1................ 13 EIU-3385............ 3.1................... 10 EIU-3386............ 3.2.1................ 12 EIU-3388............ 4.3.1................ 27 EIU-3389............ 4.3.1................ 27 EIU-3392............ 3.4.5.3.2.......... 19 EIU-3393............ 3.4.5.3.2.......... 19

Gaia


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EIU-3394 ............3.4.5.3.3...........20 EIU-3395 ............3.4.5.3.3...........20 EIU-3396 ............3.4.5.3.3...........20 EIU-3397 ............3.4.5.3.3...........20 EIU-3399 ............3.1 ...................10 EIU-3400 ............4.2.1 ................26 EIU-3401 ............3.4.5.3.2...........19 EIU-3402 ............3.4.5.3.3...........20 EIU-3403 ............4.3.1 ................27 EIU-3404 ............4.3.1 ................27 EIU-3407 ............3.4.6.2 .............22 EIU-3408 ............3.4.6.2 .............22 EIU-3409 ............3.4.6.2 .............22 EIU-3410 ............3.4.6.2 .............22 EIU-3411 ............5.2.1 ................31 EIU-3412 ............3.3.3 ................13 EIU-3413 ............3.1 ...................10 EIU-3414 ............3.2.1 ................12 EIU-3415 ............3.1 ...................10 EIU-3416 ............3.1 ...................10 EIU-3417 ............3.4.5.2 .............18 EIU-3418 ............3.1 ...................10 EIU-3419 ............3.4.5.5 .............21 EIU-3420 ............3.4.5.5 .............21 EIU-3422 ............3.4.2.2.1...........15 EIU-3423 ............3.4.2.2.2...........15 EIU-3424 ............3.4.2.2.3...........15 EIU-3425 ............3.4.2.3 .............16 EIU-3426 ............3.4.2.4 .............16 EIU-3427 ............3.4.3 ................16 EIU-3428 ............3.4.4 ................17

Gaia


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INTENTIONALLY BLANK

Gaia


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