The paper is composed of two parts. The first part describes the functions and hardware configuration of the SAX Attitude and Orbit Control subsystem (AOCS). The mode logic is described in detail and for each mode attention is given to the use of relevant sensors and actuators. Because of the short ground contact each orbit, relatively long eclipse duration and because SAX is not a spinner, the autonomy requirement has been a serious driver tor the SAX AOCS design. For that reason, special attention is paid to the fault tolerance strategy, which includes full redundant hardware, extensive health check logic, redundancy management, and numerous autonomous fallbacks to safe conditions. The second part of the paper locuses on the in orbit commissioning of the AOCS covering the initial mission phases, subsystem calibration and performance as well as a summary of problems encountered in flight. The measurements of the AOCS performance reported in this section demonstrate that, after in orbit calibration, all performance requirements have been satisfied and in some cases significantly exceeded. In the section devoted to problems encountered during commissioning emphasis is placed on practical solutions that have been implemented including modifications and tuning of AOCS software.
SAX AOCS design and in-flight experiences
SAX-AOCS-Systementwicklung und flugtechnische Erfahrungen
1997
14 Seiten, 3 Bilder, 3 Tabellen
Aufsatz (Konferenz)
Englisch
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