中国空间科学技术

• •    

月球引力转弯软着陆的制导控制研究

王大轶,李铁寿,严辉,马兴瑞   

  1. 哈尔滨工业大学!哈尔滨150001,北京控制工程研究所!北京100080,北京控制工程研究所!北京100080,中国航天科技集团公司!北京100830
  • 发布日期:2000-10-25

Guidance Control for Lunar Gravity-Turn Descent

Wang Dayi (Harbin Institute of Technology,Harbin 150001) Li Tieshou Yan Hui (Beijing Institute of Control Engineering,Beijing 100080) Ma Xingrui (China Aerospace Science Corporation,Beijing 100830)   

  • Published:2000-10-25
  • Supported by:
    国家自然科学基金资助项目! (19782 0 0 4)

摘要： 对于月球引力转弯软着陆过程 ,采用反馈线性化方法 ,对高度和速度信息分别设计了跟踪制导控制律 ,并应用微分几何的有关理论证明了这两种跟踪制导控制系统的李雅普诺夫稳定性。此外 ,根据软着陆系统推力、燃料和状态的约束条件 ,给出了引力转弯着陆过程初始条件的可达集合。最后给出的软着陆跟踪制导实例 ,只需要测得斜向距离、速度和姿态角度信息。这种制导方法测量简单 ,适于低成本的软着陆任务。

关键词: 软着陆, 非线性控制, 制导, 研究

Abstract: The feedback linearization method is utilized to generate guidance laws to track desired height and velocity profiles respectively for lunar gravity-turn descent.The Lyapunov stability of the two following control systems is demonstrated in use of related theory of differential geometry.Furthermore,an attainable set for initial conditions of the gravity-turn descent is deduced according to the constraints of thrust,fuel and states of the soft landing system.Finally,an example of the following guidance law is presented,which needs only slant range,velocity and local vertical information.This method may allow simple guidance with less complex sensors for low-cost soft landing on the lunar surface.