摘要
基于地月信息提出了一种奔月转移轨道的自主光学导航算法。该算法首先利用导航相机得到的地球和月球边缘图像与地、月几何形状模型,运用扩展源的空间获取算法导出地心和月心对应的像素,然后利用地心和月心像素、探测器的惯性姿态和该观测历元的地、月星历信息,通过基于UD分解的递推加权最小二乘算法确定了探测器轨道。还引入导航系统的可观度定义来分析了导航系统的可观性,数学仿真结果表明导航的位置误差小于30km,速度误差小于0.3m/s,证明该自主光学导航算法是有效的。
The autonomous optical navigation algorithm based on Earth-Moon information during the cislunar transfer orbit phase is presented. In the algorithm, first, the image dements of Earth and Moon centers are obtained by processing the images of Earth and Moon. Then,＂ these image elements in combination with the inertial attitude of spacecraft, and the ephemeris of Earth and Moon at the time of the observation are used to determine the orbit by using the recursive weighted least square based on UD factorization. On the side, the observability degree definition of navigation system has been introduced and applied to the observability analysis of navigation system. And the autonomous optical navigation algorithm is validated using the numerical simulation.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2006年第3期354-358,共5页
Journal of Astronautics
基金
民用航天预研课题和863计划项目
关键词
自主光学导航
奔月探测器
图像处理与计算
可观性分析
Autonomous optical navigation
Cislunar spacecraft
Image processing and compute
Observability analysis
