| 星间链路联合磁测约束的低轨星座自主导航 |
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| 引用本文： | 谭龙玉,王卫华,孙俊,韩飞,彭杨,王兆龙.星间链路联合磁测约束的低轨星座自主导航[J].空间科学学报,2018,38(3):402-408. |
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| 作者姓名： | 谭龙玉 王卫华 孙俊 韩飞 彭杨 王兆龙 |
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| 作者单位： | 1 上海航天控制技术研究所 上海 201109; |
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| 基金项目： | 国家重大专项（GFZX0301010504）和上海市科委资助项目（15DZ1160700） |
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| 摘 要： | 为解决星座仅依靠星间链路测量进行自主导航时的整体旋转和漂移问题，提出一种星间链路联合磁测约束的低轨星座自主导航方法.通过星间观测相机和磁强计，获得同轨道相邻卫星视线矢量与地磁场方向之间的角距和地磁场模值，为低轨星座引入空间基准信息.在非秩亏性分析的基础上，分别建立状态方程和量测方程，利用扩展卡尔曼滤波方法进行整星座的最优状态估计.仿真结果表明，星座卫星自主导航位置精度优于20m，速度精度优于0.05m·s-1，自主导航运行时间维持180天，能够满足低轨卫星星座自主导航的应用需求.
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| 关 键 词： | 低轨星座 磁测 星间链路 |
| 收稿时间： | 2017-02-20 |
Autonomous Navigation Scheme of LEO Constellation Based on Inter-satellite Link and Magnetic Field |
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| Affiliation: | 1 Shanghai Institute of Spaceflight Control Technology, Shanghai 201109;2 Shanghai Key Laboratory of Space Intelligent Control Technology, Shanghai 201109 |
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| Abstract: | Compared to autonomous navigation of Low Earth Orbit (LEO) constellation based on inter-satellite link only, a method for autonomous navigation of LEO constellation combining inter-satellite link and geomagnetic measurement is proposed to solve the problem about overall rotation and drifting of LEO constellation. The absolute property of geomagnetic field is fully utilized. Spatial reference information is provided for LEO constellation by obtaining and analyzing the angular distance between the line-of-sight vectors of adjacent satellites in the same orbit of the LEO constellation, as well as the direction and module value of geomagnetic field. After non-rank deficient analysis, the state equation and measurement equation are established. The optimal estimation about the whole state of LEO constellation can be realized using Extended Kalman Filtering (EKF). The simulation results demonstrate that the position error is less than 20m and velocity error is less than 0.05m·s-1. The autonomous navigation of LEO constellation can last 180 days, which meets the application requirements. |
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