失效航天器的姿态机动接管控制

为实现失效航天器寿命延长的目的，采用接管控制技术接管失效航天器姿态控制系统。针对姿态机动接管控制中，失效卫星参数不确定和推力器构型矩阵突变的问题，提出一种基于控制系统重构的失效航天器姿态机动接管控制方法。首先采用指令滤波backstepping控制来重构姿态机动接管控制律，并利用Lyapunov方法分析系统稳定性；然后对推力器构型矩阵进行重构；最后考虑燃料消耗和控制输入受限问题，通过基于约束最优二次规划的动态控制分配算法对推力器推力进行控制重分配。采用本文方法实现了对燃料耗尽航天器和部分执行机构失效航天器的姿态机动接管控制。数值仿真证明了该方法的有效性。

Takeover Control of Attitude Maneuver for Failed Spacecraft

To extend the operational life of the failed spacecraft, the technology of spacecraft attitude takeover control is used to take over its attitude control systems. The uncertain dynamics of failed spacecraft and the change of thruster configuration will constitute a formidable technical challenge for attitude takeover control. Therefore, a takeover control strategy based on control system reconfiguration is proposed for the failed spacecraft attitude maneuver. Firstly, a command filtering backstepping control method is used to reconstitute the control law and the stability of the system is analyzed using the Lyapunov function. Moreover, the reconfiguration of the thrusters is implemented by reconstituting the configuration matrix of the thrusters. Furthermore, considering the fuel consumption and the control inputs limitation, the thrust forces reallocation is achieved by the dynamic control allocation method based on constrained quadratic program. The method proposed in this paper achieves the takeover control of the failed spacecraft whose fuel has been exhausted or whose actuators are partially failed. Numerical simulations validate the feasibility of the proposed method.