A model reference adaptive control law is presented for large-angle rotational maneuvers of spacecraft using reaction jets. It is assumed that the various parameters of the spacecraft are completely unknown, and unknown but bounded disturbance torques are acting on the spacecraft. The controller includes a dynamic system in the feedback path and a reference model for generating reference attitude trajectories which are tracked by the spacecraft. The control law is a nonlinear function of the state variables of the compensator and the attitude error asymptotically converges to zero. The control system has several free parameters, and these can be chosen properly to obtain desirable response characteristics. Rapid attitude control can be achieved by using faster reference attitude trajectories, but this requires larger control torques. Extensive simulations showed that large, rapid attitude control can be accomplished in spite of the presence of time-varying disturbance torques and uncertainty in the spacecraft parameters.


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    Title :

    Nonlinear adaptive attitude control of spacecraft


    Additional title:

    Nichtlineare adaptive Lageregelung eines Raumfahrzeugs


    Contributors:
    Singh, S.N. (author)

    Published in:

    Publication date :

    1987


    Size :

    9 Seiten, 12 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English