The Space Technology 7 experiment will perform an on-orbit system-level validation of two specific Disturbance Reduction System technologies: a gravitational reference sensor employing a free-floating test mass, and a set of micro-Newton colloidal thrusters. The ST7 Disturbance Reduction System is designed to maintain the spacecraft's position with respect to a free-floating test mass to less than 10 nm/Hz, over the frequency range of 1 to 30 mHz. This paper presents the design and analysis of the coupled, drag-free and attitude control systems that close the loop between the gravitational reference sensor and the micro-Newton thrusters, while incorporating star tracker data at low frequencies. A full 18 degree-of-freedom model, which incorporates rigid-body models of the spacecraft and two test masses, is used to evaluate the effects of actuation and measurement noise and disturbances on the performance of the drag-free system.


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    Title :

    Disturbance Reduction Control Design for the ST7 Flight Validation Experiment


    Contributors:
    P. G. Maghami (author) / O. C. Hsu (author) / F. L. Markley (author) / M. B. Houghton (author)

    Publication date :

    2003


    Size :

    14 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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