守时实验室iGMAS站接收机钟差分析与时延相对校准  

Clock analysis and delay calibration of iGMAS receivers at time-keeping laboratory

作　　者：王然 杨旭海[1,2,3] 孙保琪[1,2,3] 杨海彦 张喆[1,2,3] WANG Ran;YANG Xu-hai;SUN Bao-qi;YANG Hai-yan;ZHANG Zhe(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;Key Laboratory of Precise Positioning and Timing Technology,Chinese Academy of Sciences,Xi’an 710600,China;University of 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,北京100049

出　　处：《时间频率学报》2020年第2期121-129,共9页Journal of Time and Frequency

基　　金：中国科学院“西部之光”人才培养计划“西部青年学者”B类资助项目(XAB2018B19)。

摘　　要：GNSS(Global Navigation Satellite System)接收机时延的稳定性及准确度对基于国际GNSS监测评估系统(iGMAS)跟踪站的授时性能评估、时间传递等具有重要影响。iGMAS永久跟踪站BRCH和测试跟踪站XIA3与XIA5,分别位于两个国际重要守时实验室德国联邦物理技术研究院(PTB)和中国科学院国家授时中心(NTSC)。以参与UTC国际时间比对的接收机PTBB和NTP1为参考,基于GPS观测数据,采用PPP时间传递的方法,对BRCH,XIA3和XIA53台iGMAS接收机的钟差长期稳定性进行了分析。作为对照,同时分析了并址的PT11,XIA4和XIA6等3台商用授时型接收机。结果表明:①3台iGMAS接收机的时延均具有较好的长期稳定性,不存在大幅度的系统性变化;②BRCH接收机时延300 d稳定度优于0.3 ns,与PT11相当;③XIA3与XIA5接收机时延存在2 ns左右的单天起伏,可通过并址且共天线的XIA4、XIA6进行校准。基于BIPM TAIPPP结果,对BRCH,XIA3和XIA5接收机的总时延进行了相对校准。论文相关结果可为后续基于iGMAS跟踪站的授时监测、时间传递及其他时间频率服务提供参考。The stability and accuracy of the GNSS receiver delay have an important impact on the timing performance evaluation and time transfer of the international GNSS Monitoring and Assessment System(iGMAS)tracking stations.The iGMAS permanent tracking station BRCH is located at the German Federal Institute of Physics and Technology(PTB)and two test tracking stations XIA3 and XIA5 are located at the Xi’an Campus of the National Time Service Center(NTSC)of the Chinese Academy of Sciences.The time-delay stability of the three iGMAS receivers,i.e.,BRCH,XIA3 and XIA5,was analyzed by PPP time transfer method using the GPS observation data by taking the receivers PTBB and NTP1,participated in the UTC international time comparison,as reference.Three commercial timing receivers such as PT11,XIA4,and XIA6 are simultaneously analyzed for comparison.The results indicate that:①The delay of the three iGMAS receivers shows good long-term stability,without significant systematic change.②The 300-day stability of BRCH receiver is,better than 0.3 ns,which is equivalent to PT11.③The one-day fluctuation of XIA3 and XIA5 receivers are about 2 ns,which can be calibrated by the co-antenna receivers XIA4 and XIA6.The total delay of the BRCH,XIA3,and XIA5 receivers is calibrated using the BIPM TAIPPP results.The results of this paper can be useful for subsequent timing monitoring,time transfer and other time-frequency services with iGMAS tracking stations.

关 键 词：iGMAS 协调世界时(UTC) 精密单点定位 接收机时延 相对校准 

分 类 号：P228.4[天文地球—大地测量学与测量工程]