1. Joint Meeting of the CCSDS and the OMG-SDTF
CCSDS “ Space Link Services” Area
Jean-Luc Gerner
SLS Area Director
ESA/ESTEC
11 April 2005
Joint Meeting of the CCSDS and the OMG-SDTF
Athens, Greece, 11 April 2005
11 April 2005

2. Context: CCSDS Areas Link Spacecraft Space Onboard Internetworking
Cross Support
Services
Spacecraft
Onboard
Interface
Space
Internetworking
Link
Mission Operations
and Information
Management Services
Systems Engineering

3. Charter and Scope of Area
Space Link Services address radio links:
Space Earth
Earth planets
Spacecraft spacecraft
Spacecraft planets landers, rovers, probes
Space Link Services include:
Radio Frequency and Modulation
Ranging
Channel Coding and Synchronisation
Telecommand & Telemetry Protocols
Data compression
11 April 2005

4. Working Groups and BOFs
RF & Modulation WG
Ranging WG
Channel Coding & Synchronization WG
LDPC Codes BOF
Long Erasure Codes BOF
Space Link Protocols WG
Proximity Links WG
Data Compression WG
11 April 2005

5. RF & Modulation WG, Ranging WG :
Program of Work
RF & Modulation WG, Ranging WG :
Develop recommendations for modulation techniques to cover specific needs and constraints of space missions for C/C and payload TM links.
Develop recommended high performance ranging techniques
Achievements :
Blue book covering RF & modulations techniques for both the low earth orbit and the deep space missions
Ranging standard under construction
11 April 2005

6. RF & Modulation WG, Ranging WG (products) :
Program of Work
RF & Modulation WG, Ranging WG (products) :
Recommendations
Technical Informations RF
&
Modulation
S/C -
Earth Stations
Compat.
Tests
Bandwidth
Efficient
Modulations
AVAILABLE
BOOKS
Proceedings
Earth
Stations
Bandwidth
Efficient
Modulations RF
&
Modulation
Novel
Ranging
Techniques IN
PREPARATION
update
11 April 2005

7. Channel Coding & Synchronization WG :
Program of Work
Channel Coding & Synchronization WG :
Objectives :
develop recommended channel coding and frame synchronization schemes to support all type of space links
Status :
Three blue books available :
TM channel coding
TC channel coding
Proximity links channel coding
11 April 2005

8. Low Density Parity Check Codes (LDPCC) BOF :
Program of Work
Low Density Parity Check Codes (LDPCC) BOF :
Objectives :
develop recommended coding schemes with high power and spectral efficiency, with low decoding complexity and with low residual frame and bit error rates for future high rate telemetry applications
Status :
requirements matrix and evaluation criteria are being finalized
11 April 2005

9. Long Erasure Codes BOF :
Program of Work
Long Erasure Codes BOF :
Objectives :
develop recommended coding schemes for the specific case of potentially fading links (e.g. : Ka band links)
Status :
requirements analysis, survey of potential solutions
11 April 2005

10. Space Data Links Protocols WG:
Program of Work
Space Data Links Protocols WG:
Objectives :
develop recommended framing and associated protocols schemes to provide data link layer functions for all types of space links
Status :
Three blue books available :
TM space data link protocol
TC space data link protocol
AOS space data link protocol
11 April 2005

11. Overview of Space Link Protocols
Program of Work
TM Sync &
Channel
Coding
TM Space
Data Link
Protocol
TC Sync &
Channel
Coding
TC Space
Data Link
Protocol
AVAILABLE
BOOKS
TM/TC
AOS Space
Data Link
Protocol
AVAILABLE
BOOKS
AOS
( International Space Station )
Overview of Space Link Protocols TM
Channel
Coding TC
Channel
Coding TM
Space Data
Link TC
Space Data
Link IN
PREPARATION
11 April 2005

12. Program of Work Proximity Links WG : Objectives :
develop bi-directional protocols for proximity links between spacecrafts and landers in the frame of planetary exploration
Status :
Build-1 recommendations available and covering : physical, coding & data link layers
Build-2 under development to cover second generation of communication assets at mars
11 April 2005

13. Proximity Links WG (products) :
Program of Work
Proximity Links WG (products) :
AVAILABLE
BOOKS
Proximity-1
Prox-1
Physical
Layer
Prox-1
Coding & Sync
Layer
Prox-1
Data Link
Layer
Prox-1
Physical
Layer
Prox-1
Coding & Sync
Layer
Prox-1
Data Link
Layer
Prox-1 IN
PREPARATION
Updates
11 April 2005

14. Program of Work Data compression WG : Objectives :
develop an image data compression recommendation specifically suited to the on-board high rate and real-time image compression
Status :
. recommendation under final review, associated green book being developed reference software being validated full set (recom., green book, software) should be available by end 2005
11 April 2005

15. Compression Reference Software
Program of Work
Data compression WG (products) :
Lossless
Data
Compression
Lossless
Data
Compression
AVAILABLE
BOOKS
Image
Data
Compression
Image
Data
Compression
Image
Compression Reference Software IN
PREPARATION
11 April 2005

16. More information on the WG activities and products available at :
Data compression :
Data link protocols :
RF & Modulation :
Channel Coding :
11 April 2005