Statistics – Methodology
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.509e..62p&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
Statistics
Methodology
Space Research: Computing, Software
Scientific paper
The European Space Operations Centre (ESOC) have a long experience in spacecraft mission control systems developments and use a large number of existing elements for the build up of control systems for new missions. The integration of such elements in a new system covers not only the direct re-use of infrastructure software but also the re-use of concepts and work methodology. Applying reusability is a major asset in ESOC's strategy, especially for low cost space missions. This paper describes re-use of existing elements in the ESOC production of the SMART-1 mission control system (S1MCS) and explores the following areas: The most significant (and major cost-saving contributors) re-used elements are the Spacecraft Control and Operations System (SCOS-2000) and the Network Control and TM/TC Router System (NCTRS) infrastructure systems. These systems are designed precisely for allowing all general mission parameters to be configured easily without any change in the software (in particular the NCTRS configuration for SMART-1 was time and cost effective). Further, large parts of the ESOC ROSETTA and INTEGRAL software systems (also SCOS-2000 based) were directly re-used, such as the on-board command schedule maintenance and modelling subsystem (OBQ), the time correlator (TCO) and the external file transfer subsystem (FTS). The INTEGRAL spacecraft database maintenance system (both the editors and configuration control mechanism) and its export facilities into the S1MCS runtime system are directly reused. A special kind of re-use concerns the ENVISAT approach to both the telemetry (TM) and telecommanding (TC) context saving in the redundant server system in order to enable smooth support of operations in case of prime server failure. In this case no software or tools can be re-used because the S1MCS is based on a much more modern technology than the ENVISAT mission control system as well as on largely differing workstations architectures but the ENVISAT validated capabilities to support hot-standby system reconfiguration and machines and data resynchronisation following failures for all mission phases make them a good candidate for re-use by newer missions. Common methods and tools for requirements production, test plan production and problem tracking which are used by most of the other ESOC missions development teams in their daily work are also re-used without any changes. Finally conclusions are drawn about reusability in perspective with the latest state of the S1MCS and about benefits to other SCOS-2000 based "client" missions. Lessons learned for ESOC space missions (whether for mission control systems currently under development or up-and-coming space missions) and also related considerations for the wider space community are made, reflecting ESOC skills and expertise in mission operations and control.
Davies Kevin
Pignède Max
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