Attitude control of the Ulysses interplanetary spacecraft is discussed. When the spacecraft's spin axis is not pointed to the Earth, the capability of the attitude measurement system is limited to the determination of the spin period and the Sun aspect angle. This limitation is highly critical for the first few days after the injection and for the first Trajectory Correction Maneuver (TCM). It is shown that Doppler radiometric measurements, collected primarily to estimate the spacecraft trajectory, are a valuable source of attitude information and that the attitude and orbit control system can be fully calibrated in flight using Doppler and Sun data. These techniques can be used to determine the spacecraft attitude after injection and to ensure that the first TCM is accurately carried out.


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    Titel :

    Doppler Measurements as a Source of Attitude Information for the Ulysses Spacecraft


    Beteiligte:
    J. A. Massart (Autor:in) / A. Schueltz (Autor:in)

    Erscheinungsdatum :

    1986


    Format / Umfang :

    12 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




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