By analyzing the motions of a thruster-controlled spacecraft, it is possible to provide on-line (1) thruster fault detection and isolation (FDI), and (2) vehicle mass- and thruster-property identification (ID). Technologies developed recently at NASA Ames have significantly improved the speed and accuracy of these ID and FDI capabilities, making them feasible for application to a broad class of spacecraft. Since these technologies use existing sensors, the improved system robustness and performance that comes with the thruster fault tolerance and system ID can be achieved through a software-only implementation. This contrasts with the added cost, mass, and hardware complexity commonly required by FDI. Originally developed in partnership with NASA - Johnson Space Center to provide thruster FDI capability for the X-38 during re-entry, these technologies are most recently being applied to the MIT SPHERES experimental spacecraft to fly on the International Space Station in 2004. The model-based FDI uses a maximum-likelihood calculation at its core, while the ID is based upon recursive least squares estimation. Flight test results from the SPHERES implementation, as flown aboard the NASA KC-1 35A 0-g simulator aircraft in November 2003 are presented.


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    Titel :

    Motion-Based System Identification and Fault Detection and Isolation Technologies for Thruster Controlled Spacecraft


    Beteiligte:

    Kongress:

    JANNAF 3rd Modeling and Simulation Joint Subcommittee Meeting ; 2003 ; Colorado Springs, CO, United States


    Erscheinungsdatum :

    2003-10-29


    Medientyp :

    Preprint


    Format :

    Keine Angabe


    Sprache :

    Englisch






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