Performance of intercontinental standard time transmission with different comparison methods
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.
common view time comparisonall in view time comparisonstandard time transmissionGPSBDS
万方数据
维普
