基于滑模观测器的卫星姿态控制系统滑模容错控制

针对卫星姿态控制系统执行机构故障，设计了基于滑模观测器的滑模容错控制律.采用迭代学习算法在线调节观测器滑模项切换增益，设计滑模观测器估计卫星姿态和角速度.在此基础上，将执行机构故障作为系统的未知动态，提出一种对卫星姿态控制系统执行机构故障不敏感的滑模容错控制方法.该方法利用系统输入和状态信息，结合动力学特性实现未知动态估计，以此设计滑模控制律.通过数字仿真验证了该容错控制方法的有效性.

Sliding Mode Fault Tolerant Control for Satellite Attitude Systems Based on Sliding Mode Observer

In the presence of actuator faults in attitude control system of satellite, a method of sliding mode fault tolerant control based on sliding mode observer was proposed. The estimation of attitude and angle rate was obtained via a sliding mode observer, and an iterative learning algorithm was utilized to update the switching gain of the sliding mode term. Considering actuator faults as unknown dynamics, a method of sliding mode fault tolerant control which is insensitive to the actuator faults of attitude control system of satellite was presented. By using the system, input and state information, unknown dynamics was estimated based on which a sliding mode control law was designed. Finally, the numerical simulation result demonstrates the effectiveness of the proposed fault tolerant control method.