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Reliable commanding and telemetry operations using CFDP


AuthorMelin, Eric; Krupiarz, Christopher; Monaco, Christopher; Pinkine, Nickalaus; Harrington-Duff, Patricia;
KeywordsProbes; System-on-chip; Parker Engineering
AbstractThe Solar Probe Plus (SPP) mission to be launched in 2018 is designed to use CFDP (CCSDS File Delivery Protocol) Class 2 Reliable Transfer in the majority of spacecraft commanding as well as for playback of recorded telemetry. A prioritized SSR telemetry playback interface using CFDP was developed on MESSENGER and Van Allen Probes and will be reused on SPP. Similar to MESSENGER, telemetry files of instrument data will be provided directly to the appropriate Science Operations Center (SOC) and not processed by the Mission Operations Center (MOC). The SPP flight software is built to process command files and CCSDS Telecommand packets. The SPP Ground Software has a Database of Commands to create Telecommand packets. SPP will support the Expedited Service (BD Service) of the CCSDS Communications Operations Procedure-1 (COP-1) commanding but will not use the Sequence-Controlled Service (AD Service) of COP-1 commanding. The COP-1 AD Service is not well suited for deep space without modification as it provides a limited maximum number of commands without acknowledgment and requires significant retransmission if a command is dropped. Instead, SPP will use CFDP to provide reliable delivery. The ground system will generate files of CCSDS telecommand packets and add a sequence number (similar to Transmitter_Frame_Sequence:Number in COP-1 AD Service) to the file names. This sequence allows CFDP to deliver files efficiently through dropouts and ensure commands are not executed out of the order they were queued. The use of files also helps facilitate uplink bandwidth savings by only uplinking a file to the prime processor. Once onboard, the file can be copied (also using CFDP) to the spare processors.
© 2016, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
Year of Publication2016
Journal14th International Conference on Space Operations, 2016
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