导航卫星长期自主定轨的星座旋转误差分析与控制

Constellation Rotation Error Analysis and Control in Long-term Autonomous Orbit Determination for Navigation Satellites

研究了基于星间测距进行导航卫星自主定轨的星座整体旋转问题,提出了采用星间定向观测来测定并解算星座的整体旋转量,以控制星座旋转误差对自主定轨的影响。通过仿真分析表明,在基于星间测距的自主定轨中,星座在惯性空间的方向误差随轨道弧段的增长而增加,通过星间定向可观测并消除该类误差影响,使自主定轨保持平稳和较高的精度,在60天的弧段内URE精度稳定在1.2m左右的水平。

The question of constellation rotation in autonomous orbit determination based on inter-satellite ranging was studied.Approach of observation of constellation orientation was put forward to control rotation error.Through the simulation,it is concluded that the method of constellation absolute orientation can estimate the constellation rotation error and achieve high precision orbit result.With inter-satellite ranging and absolute orientation,the URE of constellation is about 1.2 meters after 60 days arc.