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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

More information on the WG activities and products available at : Data compression : http://public.ccsds.org/sites/cwe/sls-dc/ Data link protocols : http://public.ccsds.org/sites/cwe/sls-slp/ RF & Modulation : http://public.ccsds.org/sites/cwe/sls-rfm/ Channel Coding : http://public.ccsds.org/sites/cwe/sls-cc/ 11 April 2005