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基于非同时双向星间链路的自主时间同步仿真分析

ISSN号：0001-5245
期刊名称：《天文学报》
时间：0
分类：P127[天文地球—天体测量;天文地球—天文学]
作者机构：[1]中国科学院国家授时中心,西安710600, [2]中国科学院大学,北京100049
相关基金：国家高技术研究发展计划项目（2006AA122322）、国家自然科学基金项目（11033004,11173026,41101021）资助

作者：方琳[1,2], 杨旭海[1], 孙保琪[1], 钦伟瑾[1,2], 孔垚[1,2]

关键词：天体测量学, 时间, 方法, 数据分析, 技术, 其它诸多方面, astrometry： time, methods： data analysis, techniques： miscellaneous

中文摘要：

星间链路测量是卫星导航系统实现自主运行的一项重要的关键技术．以GPS星座为例，基于非同时的星间双向测量模式，建立了星间时间同步的归算公式，给出了主要的系统误差的改正方法．利用IGS（International GNSS Service）精密星历，开展星间时间同步仿真试验，分析了非同时星间伪距数据历元归化、初始轨道以及主要系统误差对卫星钟时间同步的影响．并采用“集中式”星间自主时间同步法，计算了每颗导航卫星的广播钟差．试验结果表明，非同时星间伪距数据历元归化、初始轨道对卫星钟差影响较小，相对论效应和传播路径不对称引起的误差对卫星钟差影响大，需采用理论公式进行修正；与IGS精密钟差相比，广播钟差误差的RMS（RootMeanSquare）约为0．4ns．

英文摘要：

The measurement of the inter-satellite link is one of the key techniques in the autonomous operation of satellite navigation system. Based on the asynchronism inter- satellite two-way measurement mode in GPS constellation, the reduction formula of the inter-satellite time synchronization is built in this paper. Moreover, the corrective method of main systematic errors is proposed. Inter-satellite two-way time synchronization is simu- lated on the basis of IGS （International GNSS Service） precise ephemeris. The impacts of the epoch domestication of asynchronism inter-satellite link pseudo-range, the initial orbit, and the main systematic errors on satellite time synchronization are analyzed. Furthermore, the broadcast clock error of each satellite is calculated by the ＂centralized＂ inter-satellite autonomous time synchronization. Simulation results show that the epoch domestication of asynchronism inter-satellite link pseudo-range and the initial orbit have little impact on the satellite clock errors, and thus they needn＇t be taken into account. The errors caused by the relativistic effect and the asymmetry of path travel have large impact on the satellite clock errors. These should be corrected with theoretical formula. Compared with the IGS precise clock error, the root mean square of the broadcast clock error of each satellite is about 0.4 ns.

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