Recommendation for space data systems standards ccsds

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Unformatted text preview: 1:1994. Geneva: ISO, 1994. [5] Radio Frequency and Modulation Systems—Part 1: Earth Stations and Spacecraft. Recommendation for Space Data Systems Standards, CCSDS 401.0-B. Blue Book. Washington, D.C.: CCSDS, March 2003. NOTE – Informative references are listed in annex E. CCSDS 131.0-B-2 Page 1-5 August 2011 CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODING 2 OVERVIEW 2.1 ARCHITECTURE Figure 2-1 illustrates the relationship of this Recommended Standard to the Open Systems Interconnection reference model (reference [3]). Two sublayers of the Data Link Layer are defined for CCSDS space link protocols. The TM and AOS Space Data Link Protocols specified in references [1] and [2], respectively, correspond to the Data Link Protocol Sublayer, and provide functions for transferring data using the protocol data unit called the Transfer Frame. The Synchronization and Channel Coding Sublayer provides additional functions necessary for transferring Transfer Frames over a space link. These functions are error-control coding/decoding, Transfer Frame delimiting/synchronizing, and bit transition generation/removal. OSI LAYERS CCSDS LAYERS NETWORK AND UPPER LAYERS NETWORK AND UPPER LAYERS DATA LINK PROTOCOL SUBLAYER DATA LINK LAYER PHYSICAL LAYER CCSDS PROTOCOLS SYNCHRONIZATION AND CHANNEL CODING SUBLAYER PHYSICAL LAYER TM or AOS SPACE DATA LINK PROTOCOL TM SYNCHRONIZATION AND CHANNEL CODING RADIO FREQUENCY AND MODULATION SYSTEMS Figure 2-1: Relationship with OSI Layers 2.2 SUMMARY OF FUNCTIONS 2.2.1 GENERAL The Synchronization and Channel Coding Sublayer provides the following three functions for transferring Transfer Frames over a space link: a) error-control coding, including frame validation; b) synchronization; and c) pseudo-randomizing. CCSDS 131.0-B-2 Page 2-1 August 2011 CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODING 2.2.2 ERROR-CONTROL CODING This Recommended Standard specifies the following four types of error-control coding: a) convolutional coding (section 3); b) Reed-Solomon coding (section 4);...
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