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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。
A method of autonomous intersection of spacecraft elliptical orbit in the absence of absolute orbit information is proposed. Lawden equation is used to describe the relative motion between two stars of an elliptical orbit, and the time-varying parameters in the equation are separately classified. When the time-varying parameters can not be known, it is regarded as an uncertain quantity and constitutes an uncertain system. A robust sliding mode control method for uncertain systems is used to design the control law of elliptic orbit autonomously intersection. It is also proved that the uncertain system is asymptotically stable. Simulation results show that under the condition of only relative state information, the designed control law can realize the autonomous intersection of elliptic orbit spacecraft.