›› 2011, Vol. 31 ›› Issue (6): 27-35.doi: 10.3780/j.issn.1000-758X.2011.06.005

• 研究探讨 • 上一篇    下一篇

月球精确软着陆最优标称轨迹在轨制导方法

 梁栋1,2, 刘良栋1, 何英姿1,2   

  1. (1 北京控制工程研究所,北京 100190)(2 空间智能控制技术国家级重点实验室,北京 100190)
  • 收稿日期:2011-03-16 修回日期:2011-12-25 出版日期:2011-12-25 发布日期:2011-12-25
  • 作者简介:梁栋 1982年生,2007年获中国空间技术研究院控制理论与控制工程专业硕士学位,现为中国空间技术研究院控制理论与控制工程专业博士研究生。主要研究方向为深空探测航天器自主控制。

On-board Optimal Nominal Trajectory Guidance Method for Lunar Pinpoint Soft Landing

 LIANG  Dong1,2, LIU  Liang-Dong1, HE  Ying-Zi1,2   

  1. (1 Beijing Institute of Control Engineering,Beijing 100190)
    (2 National Key Laboratory of Science and Technology on Space Intelligent Control,Beijing 100190)
  • Received:2011-03-16 Revised:2011-12-25 Online:2011-12-25 Published:2011-12-25

摘要: 为实现在月球表面期望的着陆点进行精确软着陆(PPL),且满足燃耗最优性要求,基于提出的LIDAR目标点在轨自主选定的月球精确软着陆方案,对月球PPL最优标称轨迹在轨快速规划制导方法进行研究。首先针对月球PPL三维球体非线性轨道动力学模型,采用Legendre Gauss Lobatto伪光谱方法将轨迹优化的最优控制问题转化为非线性规划问题(NLP),再利用SQP优化算法求解月球PPL最优标称轨迹,最后通过遗传算法对优化结果进行验证,并提出应用遗传算法提供SQP在轨规划初值数据库的方案。仿真结果表明了最优标称轨迹在轨规划方法的快速性和有效性。

关键词: 制导, 精确软着陆, 最优轨迹, 伪谱法, 序列二次规划, 遗传算法, 月球探测

Abstract: To achieve the pinpoint soft landing (PPL) on a target landing site of lunar surface and minimize the fuel consumption, an optimal nominal trajectory on board rapid programming guidance method for lunar PPL was studied, based on the proposed guidance strategy with on board autonomous landing site selection by LIDAR. Firstly, according to the 3-D spherical nonlinear orbit dynamics model, the optimal control problem of trajectory optimization was transformed into a nonlinear program problem (NLP) by using Legendre-Gauss-Lobatto pseudospectral method. Secondly,sequential quadratic programming (SQP) method was used to solve the transformed problem. Finally,the optimal trajectory was verified by using genetic algorithm. And a method of providing initial value database for SQP on board trajectory programming by using genetic algorithm was proposed. The numerical simulation results show this methodology and strategy for optimal nominal trajectory on board rapid programming can meet the need of lunar PPL real time guidance.

Key words: Guidance, Pinpoint landing, Optimal nominal trajectory, Pseudospectral method, Sequential quadratic programming, Genetic algorithm, Lunar exploration