An electro-optical attitude transfer system was developed to monitor the angular orientation of magnetometers deployed at the end of a 20-foot boom extending outboard from the Magsat spacecraft. One autocollimator monitors pitch and yaw attitude, cooperating with a plane mirror at the end of the boom; a second monitors roll (twist) from an offset look-angle, using one dihedral reflector at the boom end and a second on the spacecraft. RMS errors due to all causes including linearity, G-forces, cross-coupling and translation are estimated to be 3.9 arcsec over + or - 180 arcsec excursion in pitch and yaw, and 5.3 to 7.5 arcsec over + or - 300 arcsec roll. Design and fabrication problems relative to the remote dihedral refector proved to be the most challenging, and solutions to these problems will be described.


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    Title :

    A three-axis angular monitoring system for the magnetic field satellite /MAGSAT/ mission


    Contributors:

    Conference:

    Seminar on Optical alignment ; 1980 ; San Diego, CA


    Publication date :

    1980-01-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




    The Magsat mission

    Langel, R. / Ousley, G. / Berbert, J. et al. | NTRS | 1982


    The Magsat magnetometer boom

    Smola, J. F. / Radford, W. E. / Reitz, M. H. | NTRS | 1980


    MAGSAT attitude control system design and performance

    TOSSMAN, B. / MOBLEY, F. / FOUNTAIN, G. et al. | AIAA | 1980


    Attitude transfer assembly design for MAGSAT

    Collyer, P. W. / Freund, N. P. | NTRS | 1976


    Attitude Transfer Assembly Design for MAGSAT

    P. W. Collyer / N. P. Freund | NTIS | 1976