不同比对方式下的洲际标准时间复现性能分析
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TH714

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国家自然科学基金面上项目(12073033)资助


Performance of intercontinental standard time transmission with different comparison methods
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    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。

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    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.

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许龙霞,刘 娅,陈瑞琼,赵志雄,孟令达.不同比对方式下的洲际标准时间复现性能分析[J].仪器仪表学报,2024,44(2):160-167

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  • 在线发布日期: 2024-05-14
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