The 3-axis attitude control during the orbit raising phase of the Artemis Spacecraft Salvage Mission using ION-Propulsion thrusters is described. Especially during the boost phase only inertial 2-axis attitude measurements from the Sun sensor and two axis rate measurements from the Gyros assembly are available. In contrast to the nominal operation, where the attitude is controlled with respect to a fixed orbital Earth orientation reference frame, large angle time-varying rotations have to be performed to orient the ION-Thrusters into the fuel optimal boost direction. The design consists of a new Attitude Estimator / Propagator , an adaptation of the Orbit Propagator, a continuous 3-axis Wheel Unloading Method during thruster firing and a Nonlinear Decoupling & Tracking Controller. In the Illustration below the principal maneuver strategy of the Artemis Salvage Mission is shown.


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    Title :

    Attitude controller design for the Artemis orbit raising phase


    Contributors:
    Surauer, M. (author) / Keeve, R. (author) / Ertongur, N. (author) / Muller, C. (author) / Boeinghoff, A. (author) / Mille, F. (author) / Ruhland, P. (author)


    Publication date :

    2003


    Size :

    10 Seiten, 3 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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