参数未知航天器的姿态接管控制

失效航天器的参数未知给姿态接管控制带来很大挑战,为此,针对该控制问题提出一种基于控制系统重构的失效航天器姿态接管控制方法.首先,采用改进的自适应动态逆控制重构姿态接管控制律,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,并通过基于零空间修正伪逆的控制分配算法对推力器进行推力重分配,实现对参数未知航天器的姿态接管控制.最后,通过数值仿真验证了所提出方法的有效性.

Attitude takeover control for spacecraft with unknown parameter

The unknown dynamics of failed spacecraft constitute a formidable technical challenge for attitude takeover control. Therefore, an attitude takeover control method is proposed for failed spacecraft with unknown parameter. Firstly, a modified adaptive dynamic inverse control is proposed to reconstitute the control law of service spacecraft, and the Lyapunov method is used to analyze the stability of the system. Then, the reconfiguration of thruster is implemented, which is to reconstitute the configuration matrix of thruster, and not to change the physical configuration of thruster. Furthermore, the thrust forces of thrusters can be redistributed by the control reallocation based on null-space pseudo-inverse, and achieve the attitude takeover control for failed spacecrafts with unknown parameter. Finally, numerical simulations validate the feasibility of the proposed method.