利用光学测量改进火星探测器巡航段定轨预报精度  

To Improve Orbit Determination and Prediction Accuracy for Mars Probe with Optical Measurement During Cruise Phase

作　　者：吴功友 杨悦[2] 王西京 刘宇 

机构地区：[1]宇航动力学国家重点实验室,西安710043 [2]四川大学软件学院,成都610065 [3]上海航天控制工程研究所,上海210000

出　　处：《宇航学报》2014年第2期151-156,共6页Journal of Astronautics

基　　金：国家自然科学基金(11273072)

摘　　要：针对火星探测器巡航段无线电定轨精度误差较大的情况,利用探测器上的光学照相机跟踪天火星中心从而提高定轨预报精度。研究了光学和无线电组合导航的算法,仿真计算了巡航段无线电定轨的精度,然后分析了不同精度测量条件下光学测量对巡航段火星探测器定轨预报精度的贡献,角秒级精度的光学测量能够有效改善巡航段定轨预报误差,尤其是预报误差,并且随着离火星距离越近,作用越明显。Current Mars probes are tracked normally by radio at DSN network assisted by VLBI network. During cruise phase, the error of orbit determination and prediction could be worse due to very long distance, high eccentricity and weak gravitation. For some Mars probe equipped with optical camera, the direction information of the probe relative to Mars can be used to estimate the position of the probe integrated with radio measurement. In this paper, an integrated navigation algorithm is proposed, and the accuracies of orbit determination and prediction are discussed for the Mars probe during cruise phase. It is concluded that optical measurement with arc second level error can improve the orbit determination accuracy and prediction accuracy, especially prediction accuracy.

关 键 词：精密定轨 火星探测器 无线电测量 光学测量 组合导航 

分 类 号：V474.9[航空宇航科学与技术—飞行器设计]