ccsds navigation working group

CCSDS Navigation Working Group

David Berry

10/13/2008

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Purpose

• Introduce new members of the CCSDS Navigation Working Group to the technical program of the Working Group

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Agenda

• CCSDS Overview• Navigation Working Group Overview• Navigation Working Group Documents• Q&A

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CCSDS & the Navigation Working Group

• CCSDS is an organization which acts as the “principal technical engine of ISO TC20/SC13”

• Develops international standards related to space data• Organization chart at http://

public.ccsds.org/sites/cwe/default.aspx • CCSDS consists of 6 general “Areas”• Areas are partitioned into 34 smaller groups called

“Working Groups” (WG), “Special Interest Groups” (SIG) and “Birds of a Feather Groups” (BOF)

• Each WG, SIG or BOF is associated with an Area• NAV WG is part of CCSDS Mission Operations and

Information Management Services Area (MOIMS)• Charter is to produce CCSDS Recommendations for

exchange formats of orbit, attitude, and tracking data

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CCSDS Areas (Overall Context)

Cross SupportServices

SpacecraftOnboardInterfaceServices

SpaceInternetworking

Services

SpaceLink

Services

Mission Operationsand Information

Management Services Commodity Communications &

Navigation Systems

Systems Engineering

Source: A. Hooke, NASA/JPL

GroundGround, GroundFlightOrbit Data Message (OPM/OMM/OEM) Attitude Data Message (APM/AEM)Tracking Data Message (TDM)XML Specification (NDM/XML)

FlightFlightOrbit Data Message (OPM/OEM), Attitude Data Message (APM/AEM),Tracking Data Message (TDM) XML Specification (NDM/XML)

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Standards Development Process

• A “Concept Paper” suggests need for standardization• Working Group chartered to develop Recommendation• Working Group develops material (iterative process)• Recommendation documents proceed through several

stages as they mature: Proposed (“White”), Draft (“Red”), final (“Blue”)

• White Books are internal to the Working Group• When White Book matures, promotion to Red Book• Formal Agency Review process commences (3 months)• When Agency Review is passed, prototyping (at least 2

interoperable instances) is complete and test reports filed, promotion to Blue Book occurs

• ISO standards development process is entered at an advanced stage (FDIS)

• “Green Books” are non-normative technical reports

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Nav WG Participating Membership

• The CCSDS Navigation Working Group has had regular participation from the following space agency/organizations:• ASI• CNES• DLR• ESA • JAXA• NASA (JPL, GSFC, JSC)• ISO TC20/SC14/WG3

• Agencies that have recently named representatives to the Navigation WG are: FSA

• Other agencies that participate in CCSDS , but have not been involved in Navigation WG are: BNSC, CSA, INPE

• New CCSDS Agency: CNSA - China National Space Administration

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Nav WG Documents (“Color Coded”)

• Orbit Data Messages + Extensions

• Tracking Data Message

• Attitude Data Messages

• Navigation Data Messages / XML Specification

• Navigation Data—Definitions and Conventions

• The principal objectives for the Fall 2008 Meetings are to prepare the ODM Version 2 for Blue Book conversion and prepare the NDM/XML for Agency Review (Red Book 2.0)

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Orbit Data Messages + Extensions

• Two standard message formats for exchanging orbit descriptions, soon to be three

• Orbit Parameter Message (OPM) is a state vector (position and velocity at epoch, spacecraft properties, maneuvers, descriptive metadata); must be propagated

• Orbit Ephemeris Message (OEM) is an ephemeris (position and velocity at multiple epochs, descriptive metadata), allows modeling of any number of forces

• Work started ???, became CCSDS Blue Book 09/2004 (ISO Standard # 22644 as of 01/2006)

• Orbit Data Messages are used in daily operations• Extensions to the ODM (OMM) are a current topic of the

Navigation WG via collaboration with ISO TC20/SC14, with visibility up to top levels of CCSDS and ISO TC20

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• Major Working Group Task for 2008• Formal Review: CCSDS Agency Review + ISO Review• Develop plan for prototyping• Complete design/development/testing of ODM

Prototypes• File prototyping test report• Petition the CESG and CMC for progression from Pink

Book to Blue Book

• Other desirable work• Agency/Operator infusion (implementation)

Remaining Work for “ODM Blue 2.0”

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Navigation Data Messages / XML Spec

• Describes an integrated XML schema set for encoding the ADM, ODM, and TDM

• Directive to put Navigation WG Recommendations into XML format came from CMC ~2002

• Work started 05/2004, became Red Book 11/2005 (prematurely)

• One Agency Review process completed, <10 RID’s received, dispositioned, and added to NDM/XML as applicable

• Second agency review yet to be scheduled• Current level is Red Book 1.4• Plan to progress to Blue Book by EOY 2009 (was 2008)

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• Major Working Group task for 2008• Complete ODM Blue Book 2.0 (TC20/SC14 updates)• Update NDM/XML to represent final ADM, ODM• Complete Agency Review #2 (not yet scheduled)• Create prototyping plan• Complete design/development/testing of NDM/XML

Prototypes • File prototyping test report• Petition the CESG and CMC for progression from Red

Book to Blue Book

• Other desirable work• Agency infusion (implementation)

Remaining Work for “NDM/XML Blue”

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Tracking Data Message

• Standard message format for exchanging tracking data • TDM supports widely used tracking data types:

• Ground-based radiometrics: Doppler, range, angle, ΔDOR• Ancillary information (e.g., meteorological, media delays)• Extensible to future types (e.g., SC-to-SC Doppler/range)

• Work started 10/2003, became Blue Book 11/2007• Infusion in progress at ESA, NASA/JPL, and ISRO; DLR has

a prototype implementation• Other desirable work

• Further agency infusion

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Attitude Data Messages

• Two standard message formats for exchanging spacecraft attitude descriptions

• Attitude Parameter Message (APM) specifies an attitude state at epoch, and includes spacecraft properties, maneuvers, descriptive metadata; must be propagated

• Attitude Ephemeris Message (AEM) specifies a series of attitude states at multiple epochs, descriptive metadata, allows modelling of any number of torques

• Work started ~2003, became Blue Book 05/2008• Other desirable work

• Complete XML representation of the ADM (currently updated to B1.0 compatibility, still in work)

• Agency infusion (implementation)

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Navigation DataDefinitions and Conventions

• Contains technical material related to the Navigation Working Group Recommendations

• Non-normative document• Has a different development process (all internal to the

working group, with CESG approval)• Work started early in the history of the Navigation

Working Group• Most recent edition of the Green Book was published

11/2005• Current level is Green 2.0• Several updates to this document are in order (more

attitude info, covariance matrices, TLE overview, mean elements overview, range units description)

• Work is lower in priority than the normative documents

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Useful Web Sites/Contacts

• Web Sites• www.ccsds.org – general web site of the CCSDS• http://cwe.ccsds.org/moims/default.aspx , then choose

the “MOIMS-NAV” tab on the far left menu• E-mail Address

• moims-nav@mailman.ccsds.org

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Acronyms and Abbreviations

• ADM Attitude Data Message• CCSDS Consultative Committee on Space Data Systems• CESG CCSDS Engineering Steering Group• CMC CCSDS Management Council• ΔDORDelta Differential One-Way Ranging• ISO International Organization for Standardization• MOIMS Mission Operations & Information Mgmt

Services• NDM Navigation Data Messages• ODM Orbit Data Message• OEM Orbit Ephemeris Message• OMM Orbit Mean-Elements Message• OPM Orbit Parameter Message• TDM Tracking Data Message• XML eXtensible Markup Language

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Q&A• ??? • ??? • ??? • ??? • ??? • ??? • ??? • ??? • ??? • ??? • ???