Spacecraft Telecommand: Published standards
The Consultative Committee for Space Data Systems (CCSDS) publishes recommended standards (Blue Books) for spacecraft telecommand. The standards define protocols, procedures and data structures, including the TC Transfer Frame. The recommended standards have been adopted by many space agencies including NASA.
The current CCSDS documents can be downloaded from their website at http://public.ccsds.org/. The CCSDS site also provides a link to the registry of the Space Assigned Numbers Authority. The ECSS website is at www.ecss.nl.
CCSDS recommended standards for telecommand space data links
- TC Synchronization and Channel Coding, CCSDS 231.0-B-2, September 2010 (with Technical Corrigendum 1, April 2013)
- TC Space Data Link Protocol, CCSDS 232.0-B-3, September 2015
- Communications Operation Procedure-1, CCSDS 232.1-B-2, September 2010
plus related standards:
- Space Packet Protocol, CCSDS 133.0-B-1, September 2003 (with Technical Corrigendum 1 and 2, September 2010 and 2012)
- Encapsulation Service, CCSDS 133.1-B-2, October 2009 (with Technical Corrigendum 1 and 2, September 2012 and April 2014)
- Space Assigned Numbers Authority (SANA) (replaces CCSDS 135.0-B)
Addition of Space Data Link Security (SDLS)
The September 2015 issue of the TC Space Data Link Protocol standard (CCSDS 232.0-B-3) includes the specification of the interfaces between the TC protocol and the Space Data Link Security Protocol (SDLS). We are currently updating our Telecommand Encoder Shell and Telecommand Decoder Shell products to include optional interfaces to the SDLS protocol. The new option will provide an alternative to our existing telecommand security options for the ESA Authentication Unit and the Segment Level Security Interface.
The related standard for the SDLS protocol is:
- Space Data Link Security Protocol, CCSDS 355.0-B-1, September 2015
CCSDS original recommendations
The CCSDS original recommendations for packet telecommand are now obsolete (silver status):
- Telecommand Part 1: Channel Service, CCSDS 201.0-B-3-S, June 2000
- Telecommand Part 2: Data Routing Service, CCSDS 202.0-B-3-S, June 2001
- Telecommand Part 2.1: Command Operation Procedures, CCSDS 202.1-B-2-S, June 2001
- Telecommand Part 3: Data Management Service, CCSDS 203.0-B-2-S, June 2001
The original recommendations have some differences, for example in presentation and technical terms, but the major technical content is similar to the current recommended standards.
ESA Standards and ECSS
The telecommand standards of the European Cooperation for Space Standardization (ECSS) and the European Space Agency (ESA) are based on the CCSDS recommended standards:
- Space data links - Telecommand protocols, synchronization and channel coding, ECSS-E-ST-50-04C, 31 July 2008
The ECSS standards replace the earlier ESA standards:
- ESA Packet Telecommand Standard, ESA-PSS-04-107, Issue 2, April 1992
- ESA Telecommand Decoder Specification, ESA-PSS-04-151, Issue 1, September 1993
I B + M A de Lande Long Software + Consultancy has many years of background experience with the definition of the CCSDS and ESA standards. We provided support for the development of the telecommand standards for ECSS.
CCSDS informational reports
CCSDS publishes informational reports (Green Books) which provide additional information and explanation. The Green Books relevant to telecommand include:
- Overview of Space Communications Protocols, Green Book, CCSDS 130.0-G-3, July 2014
- Space Data Link Protocols - Summary of Concept and Rationale, Green Book, CCSDS 130.2-G-3, September 2015
- TC Synchronization and Channel Coding - Summary of Concept and Rationale, Green Book, CCSDS 230.1-G-2, November 2012