月面定点软着陆次优制导控制一体化设计

Integrated Suboptimal Guidance and Control for Lunar Pinpoint Soft Landing

针对月面定点软着陆制导系统和控制系统分开设计带来的精度欠佳问题,提出了一种基于改进的ZEM/ZEV(zero-effort-miss/zero-effort-velocity)方法与反步控制方法的次优制导控制一体化设计方法。首先,对传统的ZEM/ZEV方法进行必要的改进,使其能够满足飞行安全的需要和飞行末端对于加速度的约束;其次,将反步法与改进后的ZEM/ZEV方法相结合,设计定点软着陆制导控制一体化系统;最后,对整个系统的稳定性进行了分析。标称仿真及蒙特卡洛分析结果表明,本文所提出的方法具有更好的鲁棒性、更高的制导控制精度。

It proposed an integrated guidance and control method for lunar pinpoint soft landing to deal with the mismatch between the guidance system and control system in conventional separating design philosophy. The method is based on an improved ZEM/ZEV (zero-effort-miss/zero-effort-velocity) method and the back-stepping control technique. Firstly, the ZEM/ZEV algorithm is improved and extended to satisfy the flight safety and terminal accelerate constraint. Secondly, combining the improved ZEM/ZEV method with the back-stepping technique, we design an integrated guidance and control scheme for the lunar pinpoint soft landing. Finally, the stability of the whole system is analyzed and extensive simulations are conducted. The testing results of nominal simulation and Monte Carlo analysis show that the proposed method is more accurate and more robust than the conventional separating designed one.