基于通信卫星的共视授时方法  

Method of common-view time transfer using communication satellites

作　　者：陈婧亚 许龙霞[1,2] 李孝辉[1,2] 刘音华[1,2] 李丹丹[1,2,3] 朱峰[1,2] 孟令达 樊多盛[1,3] 李晓通[1,2,3] 于烨[1,2,3] CHEN JingYa;XU LongXia;LI XiaoHui;LIU YinHua;LI DanDan;ZHU Feng;MENG LingDa;FAN DuoSheng;LI XiaoTong;YU Ye(National Time Service Center,Chinese Academy of Sciences,Xi'an 710600,China;Key Laboratory of Precision Navigation and Timing Technology,Chinese Academy of Sciences,Xi'an 710600,China;School of Physics Sciences,University of The Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院精密导航定位与定时技术重点实验室,西安710600 [3]中国科学院大学物理科学学院,北京100049

出　　处：《中国科学：技术科学》2019年第5期543-551,共9页Scientia Sinica(Technologica)

基　　金：国家自然科学基金(批准号:11503030);中国科学院国防创新基金(编号:CXJJ-16M205)资助项目

摘　　要：中国区域定位系统(CAPS)通过租用多颗GEO通信卫星上的转发器资源,可在中国区域实现定位、授时和测速服务.本文提出一种基于通信卫星的共视授时方法,该方法利用CAPS系统的通信卫星以及测定轨站资源,通过导航电文发播基准站授时偏差模型参数,用户通过单向接收卫星信号结合从电文中解调计算得到授时偏差数据,改正单向授时结果,实现共视授时.该方法精度优于5 ns,是目前精度较高的实时授时方法.用户只需单向接收CAPS授时信号,不需要事后数据交换,可以实时获得服务.本文详细介绍了基于通信卫星的共视授时原理,并搭建试验系统,测试验证提出的CAPS共视授时性能.西安-喀什、西安-三亚两长基线的试验结果表明CAPS单星共视授时精度优于GPS单星共视结果, CAPS共视授时可为用户提供优于5 ns的高精度授时服务.Chinese area position system(CAPS) can provide positioning, time and velocity service to China region users by renting several commercial communication satellites. We studied a real-time common-view time transfer method in this paper using communication satellites of CAPS. This method can fully use CAPS resources of the communication satellites and orbit determination stations to broadcast the information of timing bias mode parameters from the ground base stations. The timing bias data information can be demodulated and calculated by users from the navigation message by receiving the satellite signal in one-way, so the common-view time transfer process are implemented. This method can provide time service with the accuracy better than 5 ns, which is a kind of high accuracy time transfer method at present. Users can obtain this kind of time services in real-time and only need to receive CAPS time service signal in one-way reception way and without the process of past-data exchange. This paper provides detailed information on the principle of the common-view time transfer method based on communication satellites. Moreover, the experiment platform has been set up to test the performance of this new method. The long baseline experimental results of Xi’an-Kashi and Xi’an-Sanya indicated that the accuracy of CAPS single-satellite is better than that of GPS single-satellite common-view time transfer. The common-view time transfer based on communication satellite can provide time service to users with the accuracy better than 5ns.

关 键 词：中国区域定位系统(CAPS) 通信卫星 授时偏差模型参数 共视授时 

分 类 号：P127.1[天文地球—天体测量]