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针对卫星姿态控制系统执行机构故障情况下的姿态跟踪问题,研究了一种基于动态控制分配的容错控制方法。首先,考虑由卫星转动惯量不确定性与外界干扰组成复合干扰,设计了基于干扰观测器的反步姿态跟踪控制器,利用干扰观测器对复合干扰进行估计,并且采用李雅普诺夫方法分析了闭环系统的稳定性;其次,针对发生乘性执行机构故障的卫星姿态控制系统,设计了基于动态控制分配的容错控制方法,该方法无需对控制律进行调整,而是利用故障信息调整目标函数,通过动态控制分配方法实现容错控制。仿真结果表明,该方法能够在执行机构发生故障情况下有效完成姿态跟踪。
Aiming at the problem of attitude tracking in the case of actuator failure of satellite attitude control system, a fault tolerant control method based on dynamic control assignment is studied. First of all, considering the complex interference caused by the uncertainty of satellite inertia and external disturbance, a backstepping attitude tracking controller based on disturbance observer is designed. The interference of disturbance observer is used to estimate the complex interference. The closed loop System stability. Secondly, a fault tolerant control method based on dynamic control assignment is designed for the satellite attitude control system with fault of multiplicative actuator. This method does not need to adjust the control law, but uses the fault information to adjust the objective function, Dynamic control of distribution methods to achieve fault-tolerant control. The simulation results show that this method can effectively accomplish the attitude tracking in the event of actuator failure.