不同比对方式下的洲际标准时间复现性能分析  

Performance of intercontinental standard time transmission with different comparison methods

作　　者：许龙霞[1,2] 刘娅[1,2] 陈瑞琼[1,2] 赵志雄[1,2] 孟令达[1,2] Xu Longxia;Liu Ya;Chen Ruiqiong;Zhao Zhixiong;Meng Lingda(National Time Service Center,Chinese Academy of Sciences,Xi′an 710600,China;Key Laboratory of Time Reference and Applications,Chinese Academy of Sciences,Xi′an 710600,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]时间基准及应用重点实验室(中国科学院),西安710600

出　　处：《仪器仪表学报》2024年第2期160-167,共8页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金面上项目(12073033)资助。

摘　　要：中国科学院国家授时中心研制的标准时间复现系统具备支持洲际用户对标准时间频率信号的需求。本文以位于欧洲白俄罗斯明斯克的复现终端为分析对象,分析了共视、全视不同比对方式对复现时频信号性能的影响。对于洲际范围的时间复现,复现终端与参考端共同可视卫星数变少。单一卫星导航系统可利用的共视卫星数明显减少,GPS/BDS共视可明显增加可视卫星数量,提高共视时间比对精度,全视比对对两地共同可视卫星数没有要求。分析结果表明,单GPS全视比对就可以达到优于GPS/BDS的共视比对复现效果。受BDS卫星星间偏差的影响,基于单BDS全视比对的复现效果比GPS稍差,GPS/BDS全视比对效果略有改善。复现终端运行在GPS/BDS共视比对融合GPS全视比对模式复现的时频信号的性能最优,可以满足洲际范围内5 ns的时间同步要求,为后续洲际大尺度范围的标准时间复现终端的运行模式提供参考。The standard time transmission system developed by the National Time Service Center of the Chinese Academy of Sciences is capable of meeting the requirement of standard time-frequency signals for intercontinental users.This article takes the replication terminal located in Minsk,Belarus,and Europe as the analysis object.The impact of different comparison methods of common view and all-in-view on the performance of the replicated time-frequency signals is analyzed.For intercontinental applications,the number of satellites between the replication terminal and the reference station in common view decreases dramatically.The number of satellites in common view with GPS&BDS can reach about 9,which can benefit the accuracy of common view time comparison.All-in-view comparison has no requirements for the number of satellites common-in-view between the two sides.The experimental results show that the GPS all-in-view comparison can achieve better performance than that with GPS/BDS.Due to the inherent bias between BDS satellites,the reproduction results based on BDS all-in-view comparison are slightly worse than that with GPS.The performance of the reproduced time-frequency signal is optimal when the terminal runs in the GPS&BDS common view comparison fusion GPS all-in-view comparison mode.This article can provide some suggestions on the operation mode of standard time replication terminals which are as far as an intercontinental distance from the reference.

关 键 词：共视时间比对 全视时间比对 标准时间复现 GPS BDS 

分 类 号：TH714[机械工程—测试计量技术及仪器]