1 DLR-Workshop • „Satellitenkommunikation in Deutschland“ • Köln-Porz, 27.-28. März 2003

Universal Workplace and S-Band Communicationaboard the International Space Station

Dr.-Ing. W. GrietheKayser-Threde GmbH

Wolfratshauser Strasse 48D-81379 München

Tel: +49 – (0) 89 – 7 24 95 -128Fax: + 49 – (0) 89 – 7 24 95 -104

E-Mail: gr@kayser-threde.de

Köln, 27. März 2003

2 DLR-Workshop • „Satellitenkommunikation in Deutschland“ • Köln-Porz, 27.-28. März 2003

IntroductionOn a universal workplace presently being built on the Service Module for the ISS a self-contained communication system will be made available (CUP).

Characteristics:

n Operational mid 2004

n Commanding of the payloads from ground

n Transmission of payload data to ground

n Direct link to GSOC ground station in Weilheim/Germany

n Real-time operation possible CUP increases the communication capabilities from/to ISS-RS substantially.

n CUP is designed to allow connection to internal or external payloads.

n CUP is well suited for applications from the ISS.

3 DLR-Workshop • „Satellitenkommunikation in Deutschland“ • Köln-Porz, 27.-28. März 2003

4 DLR-Workshop • „Satellitenkommunikation in Deutschland“ • Köln-Porz, 27.-28. März 2003

Description of the Universal Workplace URM-D

n Modular Design

n Accommodation of several external payloads at the same time

n Usable for different payloads

n Located at the port side ofthe Service Module

n Available in 2004

5 DLR-Workshop • „Satellitenkommunikation in Deutschland“ • Köln-Porz, 27.-28. März 2003

Technical Characteristics of URM-D (1)

n Three external payload sites in the basic configuration

n Extension structure of payload sites provides maximum availability of flight opportunities for the customers.

n Payload dimensions (for transport): 400 x 500 x 1200 mm

n Payload mass up to 150 kg

n Mechanical interface to URM-D by active adapter

6 DLR-Workshop • „Satellitenkommunikation in Deutschland“ • Köln-Porz, 27.-28. März 2003

Technical Characteristics of URM-D (1), cont.

n Good, unshaded visibility to zenith, nadir, port and wake

n Power (28.5 V DC) available for operation and hibernation

n Power consumption of up to 300 W per payload

n Commanding of the payloads and data transfer via RS422 and Ethernet 10/100 BaseT

n Digital and analogue I/O available

n ISS On-board time available at the payload site

7 DLR-Workshop • „Satellitenkommunikation in Deutschland“ • Köln-Porz, 27.-28. März 2003

Dedicated Infrastructure for Payloads at URM-D-D

n On-board Computer (OBC)

n Communication Unit for Payloads (CUP)

n OBC connects the payloads to the S-band communication link (CUP)

n OBC enables commanding of the payloads, the processing of housekeeping data and the temporary storage of payload data

8 DLR-Workshop • „Satellitenkommunikation in Deutschland“ • Köln-Porz, 27.-28. März 2003

On-Board Computer

n Accommodated inside the Service Module

n Powerful modern VME computer system (200 MHz Power PC)

n Sercos, Ethernet interface

n Discrete and analogue I/O’s

n High data rate RS422 I/F (up to 4 Mbps)

n TM/TC interface to CUP

rearI/O

wiring

SERCOS(PMC)

P1

P1

P1

P2

P2

RSENC(PMC)

RSDEC(PMC)

J

J

Ana In(IP Mezz.)

discr.RS422 I/O(IP Mezz.)J

Main CPU

Comm's CPU

Misc. I/O(IP Carrier)

datasync

Joints(Robotic S/S)

dataCUP(S-Band Comm's)

CUP(S-Band Comm's)

6xanaCUP

(S-Band Comm's)

carrier lock

PDU

VMEback-plane

J2

J1

J1

J1

J2

J2

P2

J

J

Ethernet

COM1

J

COM3/4

Video S/S

Test

Ethernet(ISS-RS)

Power Supply

+12 -12+5

J

J

input volt. + temp.

OBC Power(from ISS-RS)

temp./voltagemonitoring(to ISS-RS)

OBC Box (w.r.t. connectors)

P

P

P

J

P

P

P

P

P

P

J

J

J

Pclock

data P

Pclock

COM1

J later optionto expandP

J Ethernet(Test)P

Ethernet

COM5

J

P

J P

SCSI

Power

HDD(optional)

Dataslot 1

slot 3

slot 5

9 DLR-Workshop • „Satellitenkommunikation in Deutschland“ • Köln-Porz, 27.-28. März 2003

ETH

ER

NE

T

PO

WER

POW

ER

HK

Dat

aH

KIND

OO

R IS

SO

UTD

OO

R IS

SG

RO

UN

D

POW

ER

ETH

ERN

ET

POW

ER

PO

WER

PO

WER

ETH

ER

NE

T

ETH

ERN

ET

ETH

ER

NE

T

10 DLR-Workshop • „Satellitenkommunikation in Deutschland“ • Köln-Porz, 27.-28. März 2003

Communication Unit for Payloads (CUP)

5.7 per dayAverage number of orbits with contact to ground station

7.5 minutesAverage contact time to ground station

TX 30 Watts (max)RX 3 Watts (max)

Power consumption

20 to 36 VoltsPower supply

BPSKReceive modulation

256 kbpsData rate uplink

BPSKTransmit modulation

4 MbpsData rate downlink

TX 2200 – 2290 MHzRX 2025 – 2110 MHz

Frequency range

11 DLR-Workshop • „Satellitenkommunikation in Deutschland“ • Köln-Porz, 27.-28. März 2003

Communication Unit for Payloads (CUP), cont.

The coverage time can be expanded by adding additional ground stations to GSOC/Weilheim

n MASPALOMAS

n KIRUNA

n MOSCOW

n VARIOUS RUSSIAN GROUND STATION

12 DLR-Workshop • „Satellitenkommunikation in Deutschland“ • Köln-Porz, 27.-28. März 2003

Russian Loutch(not launched)

NASATDRSS

VirtualLaboratory

ZUP

RKK

ZPK IHEDMoscow

GSOCCol-CC

EAC KT

AppliedResearchInstitutionIN

DU

STR

Y

Russian Segment

S-Band(under

developement)S-Band(TBD)

NASANetwork

Euro

pean

Seg

men

t

Col

umbu

s

US Segment

Jape

nese

Segm

ent

JEM

TV-S