航天器椭圆轨道自主交会的鲁棒滑模控制

Robust Sliding Mode Control for Autonomous Rendezvous of Spacecraft on Elliptical Orbit

提出了一种在缺少绝对轨道信息时的航天器椭圆轨道自主交会方法。用Lawden方程描述椭圆轨道的两星相对运动关系,将方程中的时变参数单独归类。在时变参数无法获知时,视其为不确定量,构成不确定系统。用不确定系统的鲁棒滑模控制方法设计了椭圆轨道自主交会的控制律,并证明了不确定系统为渐进稳定。仿真结果表明:在仅有相对状态信息条件下,设计的控制律能实现椭圆轨道航天器的自主交会。

An approach for spacecraft autonomous rendezvous without orbit information in the elliptical orbit was developed in this paper. Lawden equation was used to describe the relative motion of two spacecrafts, and all the variable parameters in the equation were classified. Under the assumption of the variable parameters unavailable, the uncertain system was constructed. Based on the uncertain system, a control law using robust sliding mode control was designed. And the uncertain system was proved to be asymptotieally stable under this control law. The simulation results showed that the robust sliding mode control could realize autonomous rendezvous in the elliptical orbit with relative state information only.