A novel finite-time controller integrated with a disturbance observer is proposed tor a combined spacecratt,which is composed of a service spacecraft and a target spacecraft with large uncertainty of inertia momentum.Firstly,a modified super-twisting disturbance observer is designed so that the reconstruction of the generalized disturbances in terms of the inertia uncertainty and the external disturbance is accomplished in finite time.Then,with the reconstructed information,a finite-time controller is synthesized with the backstepping method.Besides,the command filter is also introduced to the finite-time controller which can improve the control performance.And the closed-loop system/state is proved to be finite-time stable.The numerical simulations validate the effectiveness and feasibility of the proposed control scheme.%针对服务航天器与非合作空间目标构成的组合体航天器的姿态控制问题,提出一种基于干扰观测器的有限时间控制策略.首先,设计一种改进的超螺旋干扰观测器对由非合作目标导致的较大转动惯量不确定性及外界干扰进行观测,并分析了观测误差的有限时间收敛特性;然后,结合反步法设计了有限时间姿态控制器,同时引入指令滤波器提高了反步法的控制性能;最后,通过数值仿真校验了所提算法的有效性.
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