耦合扰动下空间翻滚目标的接触消旋输出反馈控制

The robust control problem of service spacecraft under unknown fast time-varying strong coupling disturbances is studied for the flexible-brush-based detumbling mission of space tumbling target. Firstly, a dynamic model of the detumbling system consisting of service spacecraft, brush, and target satellite is established. A contact detection algorithm based on the minimum distance criterion is proposed to achieve accurate detection of the contact points between the brush and the target panels. On this basis, the finite time extended state observer is used to estimate the coupling disturbance and spacecraft state in real time. This observer is combined with terminal sliding mode control technology to design a robust output feedback control strategy, which cannot depend on velocities information to ensure the finite time convergence for attitude stabilization and position tracking of the service spacecraft. It is applied to the detumbling system, and the simulation results verify the effectiveness and robustness of the proposed strategy.