基于星间链路的导航卫星时间自主恢复策略

陈婷婷; 林宝军; 龚文斌; 常家超

doi:10.11728/cjss2020.03.419

基于星间链路的导航卫星时间自主恢复策略

doi: 10.11728/cjss2020.03.419 cstr: 32142.14.cjss2020.03.419

陈婷婷^1,2,3,4,
林宝军^3,4, ,,
龚文斌³,
常家超³

1. 中国科学院上海微系统与信息技术研究所上海 200050;
2. 上海科技大学信息学院上海 201210;
3. 中国科学院微小卫星创新研究院上海 200120;
4. 中国科学院大学北京 100049

基金项目:

国防科技创新特区项目（17H86301ZT00100505）和上海市青年科技英才扬帆计划项目（19YF1446400）共同资助

详细信息

作者简介:

陈婷婷,E-mail:tingmuse@163.com

通讯作者:

林宝军,E-mail:linbaojun@aoe.ac.cn

中图分类号: V324.2+4
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出版历程
- 收稿日期: 2019-04-11
- 修回日期: 2019-10-22
- 刊出日期: 2020-05-15

Time Recovery Strategy of Navigation Satellite Based on Inter-satellite Link

1. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050;
2. School of Information Science and Technology, ShanghaiTech University, Shanghai 201210;
3. Innovation Academy for Microsatellites, Chinese Academy of Sciences, Shanghai 200120;
4. University of Chinese Academy of Sciences, Beijing 100049

摘要

摘要: 基于北斗导航卫星星间链路的测距与数传功能，针对自主导航时卫星时频子系统异常导致载荷系统断电重启的情况，提出了一种基于星载计算机自主计时及星间链路误差校正的策略.在载荷系统重启时间内，利用星载计算机守时，并通过十秒稳定度预报晶振频率漂移量的方法，维持星钟在重启时间内的稳定.载荷系统重启后，星载计算机授时给导航任务处理机，通过误差分析计算出总误差.该误差在星间链路建链误差允许范围内，然后通过星间链路对星钟误差进行校正恢复，重新实现星地时间同步.
- 星间链路 /
- 自主导航 /
- 时间同步 /
- 星载计算机
Abstract: When the Beidou navigation satellite is on autonomous navigation, the satellite time-frequency system abnormality will cause the load time system to power off and restart, which is an intrackable problem. For this reason, a new strategy is proposed using ranging and data transmission functions of the Beidou inter-satellite link. Due to the stability and accuracy of the current on-board computer crystal oscillator, the method of using ten-second stability for predicting crystal frequency drift to calculate satellite time instead of the crystal oscillator is proposed to make sure the satellite clock is stable during the restart time of the load system. With this method, total error can satisfy the allowable range of inter-satellite link construction error. After the load system is restarted, the on-board computer gives the navigation task processor a standard time and total error is calculated through error analysis system, which can also meet inter-satellite link standard. The satellite clock error can be fixed through the inter-satellite link to re-synchronize the satellite time and ground time.
- Inter-satellite link /
- Autonomous navigation /
- Time synchronization /
- Onboard computer

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参考文献(15)

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