Independent SCPS-TP development for fault-tolerant, end-to-end communication architectures

Details Independent SCPS-TP development for fault-tolerant, end-to-end communication architectures Independent SCPS-TP development for fault-tolerant, end-to-end communication architectures

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.509e..74e&link_type=abstract

In: Proceedings of DASIA 2002, 13 - 16 May 2002, Dublin, Ireland. Ed.: R. A. Harris. ESA SP-509, Noordwijk, Netherlands: ESA Pub

Computer Science

Performance

Space Research: Computing, Software

Scientific paper

A fully networked architecture provides for the distribution of computing elements, of all mission components, through the spacecraft. Each node is individually addressable through the network, and behaves as an independent entity. This level of communication also supports individualized Command and Data Handling (C&DH), as well as one-to-one transactions between spacecraft nodes and individual ground segment users. To be effective, fault-tolerance must be applied at the network data transport level, as well as the supporting layers below it. If the network provides fail-safe characteristics independent of the mission applications being executed, then developers need not build in their own systems to ensure network reliability. The Space Communications Protocol Standards (SCPS) were developed to provide robust communications in a space environment, while retaining compatibility with Internet data transport at the ground segment. Although SCPS is a standard of the Consultative Committee for Space Data Systems (CCSDS), the adoption of SCPS was initially delayed by US export regulations that prevented the distribution of reference code. This paper describes the development and test of a fully independent implementation of the SCSP Transport Protocol, SCPS-TP, which has been derived directly from the CCSDS specification. The performance of the protocol is described for a set of geostationary satellite tests, and these results will be compared with those derived from network simulation and laboratory emulation. The work is placed in the context of a comprehensive, fault-tolerant network that potentially surpasses the failsafe performance of a traditional spacecraft control system under similar circumstances.

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