月球精确软着陆制导轨迹在轨鲁棒跟踪  

On-Board Robust Tracking of Guidance Trajectory for Lunar Pinpoint Soft Landing

作　　者：梁栋[1,2] 何英姿[1,2] 刘良栋[1] 

机构地区：[1]北京控制工程研究所,北京100190 [2]空间智能控制技术重点实验室,北京100190

出　　处：《空间控制技术与应用》2011年第5期8-13,共6页Aerospace Control and Application

摘　　要：为实现在月球表面期望的着陆点进行精确软着陆(PPL),在开环制导规划出的最优标称轨迹基础上,考虑动力下降过程中的干扰和不确定性,对在轨闭环轨迹跟踪制导方法进行研究.针对月球PPL三维球体非线性轨道动力学模型,充分考虑自主制导的鲁棒性、实时性要求,采用动态平面控制技术的思想,解决退步法存在的"计算复杂性膨胀"问题,并证明了闭环系统的稳定性.仿真算例表明,该方法不仅算法简单,过渡过程能够实现快速跟踪,而且能够保证稳态跟踪误差在预先给定的范围之内且可以自由调节.Considering disturbances and uncertainties,a closed-loop guidance system is designed on the basis of optimal nominal trajectory generated by open loop guidance law.From the point of view of real-time performance,the dynamic surface control（DSC） technique is used to overcome the ＇explosion of computation complexity＇ problem of the traditional backstepping method.The designed robust tracking guidance law for the uncertain nonlinear system with modeling errors and external disturbances is simpler than the existing algorithms based on the traditional backstepping method.It is theoretically proved by using the Lyapunov stability theory that the closed-loop system is uniformly bounded.And the steady-tracking errors stay in the prescribed bound.The performance and effectiveness of the proposed synthesized closed-loop nonlinear guidance system are verified by numerical simulation results.

关 键 词：制导 精确软着陆 不确定非线性系统 鲁棒跟踪 

分 类 号：V448.2[航空宇航科学与技术—飞行器设计]