This paper investigates relative motion control for a rigid spacecraft with parametric uncertainties and external disturbances to approach an unknown tumbling space target. State feedback controllers for relative translation and relative rotation are designed based on a unified adaptive robust control with L2-gain performance. Parametric uncertainties and unknown dynamic couplings are compensated online with adaptive update laws. An external disturbance is treated as a bounded perturbation input for the system. To synthesize the controllers and achieve a prescribed L2-gain performance index, the feedback gains of the controllers are designed by solving linear matrix inequalities. Indeed, perturbation attenuation with respect to the controlled output is ensured in the L2-gain sense. Moreover, in the absence of perturbation input in the closed-loop system, asymptotical convergence of the relative position and relative attitude are proved by using the Lyapunov stability theory. Numerical simulations are performed to show that position tracking and attitude synchronization are accomplished in spite of the presence of unknown dynamic couplings, parametric uncertainties, and external disturbances.


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    Title :

    Adaptive Robust Control with


    Contributors:


    Publication date :

    2016




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    Local classification TIB:    770/7040
    BKL:    55.60 Raumfahrttechnik



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