Abstract Relative motion control with six degrees of freedom (6-DOF) for spacecraft proximity operations in prescribed performance control (PPC) framework has become a hot issue in recent years, but actuator failure is seldom involved in controller design. In this paper, we introduce a complete thruster model to describe the actuator characteristics for thruster-only spacecraft, considering efficiency loss, thrust fluctuation and saturation. Besides, the barrier Lyapunov function (BLF) method and homeomorphic mapping method are often used in the PPC framework to constrain transformed errors. However, the two methods have singularity and infinite control effort problem once the constraints are not satisfied because of the actuator failure or other disturbance. In this paper, a novel bounded BLF (BBLF) is proposed to solve this problem. The proposed BBLF can still maintain bounded control effort and guarantee the system stability even if the transformed errors exceed the boundary. Further, the model uncertainty, actuator output uncertainty and external disturbance are summarized as lumped disturbances. A finite-time extended state observer (FTESO) is constructed to estimate the lumped disturbances. Finally, based on the estimated information from FTESO, an adaptive backstepping controller is proposed to track the desired trajectory. Numerical simulation results show the excellent dynamic response and steady-state accuracy of the proposed control strategy.


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    Titel :

    Finite-time extended state observer based prescribed performance fault tolerance control for spacecraft proximity operations


    Beteiligte:
    Wang, Kun (Autor:in) / Meng, Tao (Autor:in) / Wang, Weijia (Autor:in) / Song, Renting (Autor:in) / Jin, Zhonghe (Autor:in)

    Erschienen in:

    Advances in Space Research ; 70 , 5 ; 1270-1284


    Erscheinungsdatum :

    2022-05-31


    Format / Umfang :

    15 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch