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环月探测器自主天文导航系统的可观度分析

刘萍;王大轶;黄翔宇;   

  1. 北京控制工程研究所,北京控制工程研究所,北京控制工程研究所 北京 100080,北京 100080,北京 100080
  • 发布日期:2007-12-25

Analysis of Observable Degree in Autonomous Celestial Navigation System of Lunar Orbiter

Liu Ping Wang Dayi Huang Xiangyu (Beijing Institute of Control Engineering,Beijing 100080)   

  • Published:2007-12-25

摘要: 文章提出了在环月段以月球—探测器—恒星、月球—探测器—太阳这两个位置面和月心距等观测信息进行滤波的导航方法。通过对几种非线性系统可观性分析方法的比较,在基于误差协方差阵的可观性分析方法基础上,提出了以谱半径定义的可观度分析方法,并证明了定义的可观度指标与系统导航精度的关系,说明其能够定量描述系统可观的程度。最后仿真验证了这种可观度分析方法的可行性。

关键词: 谱半径, 误差协方差阵, 可观测度, 自主天文导航

Abstract: An autonomous orbit determination system based on two angles and selenocentric distance was studied.One angle was between the lines of sight to a star and selenocentric direction, and the other was between the sun and selenocentric direction.A modified observability analysis method defined by the spectral function was presented through the study on some nonlinear system. And the relationship between the observable degree and the accuracy of the system was proved.The simulation resalts show that the modified method is feasible.

Key words: Spectural radius, Error covariance array, Observable degree, Autonomous celestial navigation, Lunar orbiter