The commanding of spacecraft is a potentially hazardous activity for the safety of the spacecraft. Present day control systems contain safety features in their commanding subsystem and in addition, strict procedures are also followed by operations staff. However, problems have occurred on a number of missions as a result of erroneous commanding leading in some cases to spacecraft contingencies and even to near loss of the spacecraft. The problems of checking commands in advance are increased by the tendency in modern spacecraft to use blocked/time-tagged commands and the increased usage of on-board computers, for which commands changing on-board software tables can radically change spacecraft or subsystem behavior. This paper reports on an on-going study. The study aims to improve the approach to safety of spacecraft commanding. It will show how ensuring 'safe' commanding can be carried out more efficiently, and with greater reliability, with the help of knowledge based systems and/or fast simulators. The whole concept will be developed based on the Object-Oriented approach.


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    Title :

    Safety aspects of spacecraft commanding


    Contributors:
    Peccia, N. (author)


    Publication date :

    1994-11-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English





    Safety Aspects of Spacecraft Commanding

    Peccia, N. / Goddard Space Flight Center | British Library Conference Proceedings | 1994



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