The design concept developed for the pointing system of the High-Resolution Imaging Spectrometer (HIRIS) which will be flown on one of NASA's Earth observing system platforms is presented. The instrument is an F 5.4-aperture spectrometer with a focal length of 1222 mm, and it uses a precision two-axis gimballed mirror pointing system to image and track targets. Pointing accuracy of better than 585 arcsec (peak-to-peak), and pointing jitter of less than 2.65 arcsec in 33 ms are ensured through the use of gimbal position and basebody rate sensors. A state-space controller implemented with a digital computer is used to provide a position loop bandwidth of 1 Hz and a rate loop bandwidth of 7 Hz. An overview of the system design and flight hardware is given, the development of the controller architecture is addressed, and a simulation assessment of the pointing system that takes into consideration issues such as nonlinear effects, sensor noise, and noncollocated sensors and actuators in a flexible structure is discussed.


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    Title :

    Precision pointing control for an orbital Earth observing system


    Additional title:

    Regelung hoher Genauigkeit für die Ausrichtung der Satellitenbahn eines Erdbeobachtungssystems


    Contributors:
    Robeck, L.S. (author) / Rathbun, D.B. (author) / Lehman, D.H. (author)

    Published in:

    Publication date :

    1991


    Size :

    7 Seiten, 5 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





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