The shuttle infrared telescope facility (SIRTF) is mounted in the orbiter on the instrument pointing system (IPS) and requires that the image at the focal plane be stabilized to better than 0.25 arcsec in order to achieve the scientific goals of the device. Ourrent estimates of IPS performance accuracy indicate that additional stabilization will be necessary to meet the SIRTF requirements. An image motion compensation system, utilizing a charge coupled device (CCD) star tracker located at the focal plane and a steerable mirror in the SIRTF optical path, has been designed to work in conjunction with the IPS. The CCD tracks multiple stars simultaneously and through the use of a high-performance microcomputer generates three-axis attitude errors and gyro drift estimates to correct disturbances not compensated for the IPS control system. The SIRTF control system is described in detail and performance is analyzed with respect to system noise inputs, environmental disturbances, and error sources such as bending and feed-forward scale factor. It is concluded that the SIRTF accuracy and stability requirements can be met with this design.


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    Title :

    Image motion compensation system for the shuttle infrared telescope facility


    Additional title:

    Ein Lageregelungssystem (Image Motion Compensation System) fuer die Infrarotteleskopeinrichtung des Space-Shuttles


    Contributors:
    Lorell, K.R. (author) / Parsons, E.K. (author) / Powell, J.D. (author)

    Published in:

    Automatica, Oxford ; 17 , 4 ; 555-562


    Publication date :

    1981


    Size :

    8 Seiten, 10 Bilder, 11 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English