| 星地动态双向时间同步与测距算法 |
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| 引用本文： | 黄飞江,卢晓春,刘光灿,孙利平,张文希,杨丞.星地动态双向时间同步与测距算法[J].宇航学报,2014,35(9):1050-1057. |
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| 作者姓名： | 黄飞江 卢晓春 刘光灿 孙利平 张文希 杨丞 |
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| 作者单位： | 1.长沙学院电子与通信工程系，长沙 410022； 2.中国科学院国家授时中心，西安 710600；
3.中国科学院精密导航定位与定时技术重点实验室，西安 710600 |
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| 基金项目： | 国家自然科学基金资助项目（11073022,10673011）；湖南省自然科学基金资助项目（11JJ3072）；湖南省教育厅科学研究基金资助项目（13A115,10C0413）；中国科学院精密导航定位与定时技术重点实验室开放基金资助（2009PNTT07）；长沙市科技计划项目资助（K1309019-11, K1309035-11） |
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| 摘 要： | 针对卫星运动对星地距离和钟差测量的不利影响，提出一种基于最小二乘拟合的星地动态双向时间同步与测距算法。在建立星地可视模型基础上，仿真了MEO运动卫星与地面时间同步站之间星地距离的变化规律，分析了卫星运动对星地双向时间同步与测距的主要不利影响。该算法首先利用星地双向时间同步数据分别生成星地距离和钟差拟合多项式，然后联合求解出运动卫星误差最小的星地距离与钟差。实验结果表明了该算法的合理性和科学性，在包含仿真误差的条件下，其时间同步精度优于3ns，测距精度优于3m。将其应用到各种空天应用系统的星地时间同步与测距中，可以消除卫星运动对双向时间同步与测距的不利影响，提高时间同步与测距精度。
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| 关 键 词： | 空天应用系统 卫星通信 双向时间同步 星地测距 |
| 收稿时间： | 2013-07-19 |
An Algorithm for Dynamic Satellite Ground Two Way Time Synchronization and Ranging |
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| HUANG Fei jiang,LU Xiao chun,LIU Guang can,SUN Li ping,ZHANG Wen xi,YANG Cheng.An Algorithm for Dynamic Satellite Ground Two Way Time Synchronization and Ranging[J].Journal of Astronautics,2014,35(9):1050-1057. |
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| Authors: | HUANG Fei jiang LU Xiao chun LIU Guang can SUN Li ping ZHANG Wen xi YANG Cheng |
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| Institution: | 1. Department of Electronics and Communication Engineering, Changsha University,Changsha 410022 , China；
2. National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China；
3.Key Laboratory of Precision Navigation and Timing Technology, Chinese Academy of Sciences,Xi’an 710600, China |
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| Abstract: | Aiming at the negative impact of the satellite motion on the measurements of satellite ground range and clock offset, an algorithm for dynamic satellite ground two way time synchronization and ranging based on least square fitting is proposed. On the basis of the establishment of the satellite ground visible model, the rule of variation of the range between MEO satellite and ground station is simulated, and the main negative impacts of satellite motions on satellite ground two way time synchronization and ranging is analyzed. In this algorithm, the satellite ground range and the clock offset corresponding to minimal error are solved by using the combination of satellite ground range fitting polynomial and clock offset fitting polynomial generated by using the data related to satellite ground two way time synchronization. Experimental results show that accuracies of time synchronization and ranging better than 3ns and 3m can be achieved respectively in the presence simulation error. The algorithm will be used in accurate ranging and time synchronization of various aerospace application systems to eliminate the negative impact of satellite motion on two way time synchronization and ranging and improve the accuracies of time synchronization and ranging. |
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| Keywords: | Aerospace application system Satellite communication Two way time synchronization Satellite ground range measurement |
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