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北斗星地双向时频传递与广广播钟差精度分析
引用本文:巩秀强,陈俊平,周善石,吴斌. 北斗星地双向时频传递与广广播钟差精度分析[J]. 天文学进展, 2019, 0(2): 178-186
作者姓名:巩秀强  陈俊平  周善石  吴斌
作者单位:中国科学院上海天文台;中国科学院大学
基金项目:上海市科委基金(16511103003);国家自然科学基金(11573035)
摘    要:与其他卫星导航系统不同,北斗卫星导航系统采用星地双向时间比对技术,直接测量卫星钟相对于地面保持的系统时间的钟差,并用于广播电文钟差参数的建模。讨论了电离层延迟误差、卫星相位中心误差等不同误差源对不同类型卫星双向时间同步卫星钟差精度的影响。实测数据分析结果表明,星地双向卫星钟差内符合精度(RMS)优于0.15 ns。利用双向卫星钟差序列,对广播星历钟差参数预报精度进行了分析,统计结果显示广播电文钟差参数预报1 h,精度在2 ns以内,移动卫星刚入境时,钟差参数预报6 h误差可达10 ns。

关 键 词:北斗卫星导航系统  双向时频传递  广播钟差参数

The Two Way Satellite-Ground Time Transfer of BDS and Accuracy Analysis of Broadcast Clock
GONG Xiu-qiang,CHEN Jun-ping,ZHOU Shan-shi,WU Bin. The Two Way Satellite-Ground Time Transfer of BDS and Accuracy Analysis of Broadcast Clock[J]. Progress In Astronomy, 2019, 0(2): 178-186
Authors:GONG Xiu-qiang  CHEN Jun-ping  ZHOU Shan-shi  WU Bin
Affiliation:(Shanghai Astronomical Observatory,Chinese Academy of Science,Shanghai 200030,China;University of Chinese Academy of Sciences,Beijing 100049,China)
Abstract:The satellite clock parameters in broadcast ephemeris of Beidou navigation satellite system(BDS)is derived through the two-way satellite-ground time transfer(TWSTT)technique,where the satellite clock is directly measured using the ground antennas of monitoring stations.The mathematical model of BDS TWSTT is presented in this paper,and the random noise of observed data is analyzed,showing the RMS better than 0.15 ns.Modeling errors of the ionospheric delay and satellite phase centers affecting the measuring accuracy of TWSTT is analyzed.The time series of the TWSTT clocks are used to fit and predict the clock parameters.Statistical results show that accuracy of the navigation message clock parameters is up to 2 ns within 1 h,and the satellite clock error of IGSO/MEO could be 10 ns within 6 h due to the absense of TWSTT ground tracking.
Keywords:BDS  TWSTT  parameters of broadcast clock
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