基于滑模控制的卫星姿态控制算法研究

Research on Attitude Control Design for Rigid Satellite Based on Sliding Mode control method

针对卫星姿态控制系统存在外部扰动和执行器故障的情况下,提出一套基于非线性观测器技术和滑模控制理论的姿态控制算法;首先,建立含有外部扰动和执行器故障的刚体卫星姿态控制系统运动学方程和动力学方程;然后,通过非线性干扰观测器估计系统中的未知故障,进而利用故障信息基于滑模控制策略设计姿态控制器;通过Lyapunov函数证明闭环姿态控制系统的稳定性;最后通过数值仿真验证该容错控制方案的鲁棒性和可行性。

In this paper,a kind of control algorithm is proposed for the rigid satellite attitude systems with external disturbance and actuator faults by using sliding mode control scheme and nonlinear observer technique.Firstly,the satellite attitude systems＇ kinematic equations and dynamic equations with external disturbance and actuator faults are given.Then,a nonlinear observer is given to obtain the estimate value of actuator faults.Based the fault estimate information,a fault-tolerant controller is designed in the framework of sliding mode control.Meanwhile,the Lyapunov theory is used to analyze the stability of the closed-loop attitude systems.Finally,simulition results are given to illustrate the robustness and effectiveness of the developed fault-tolerant control scheme.