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- 2018
一种高精度的国家标准时间远程复现方法
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Abstract:
国家授时中心保持的协调世界时UTC （NTSC）（Coordinated Universal Time，National Time Service Center）与UTC的偏差保持在±10 ns以内。为了使远程用户获得高精度的UTC （NTSC）时间频率信号，利用国家授时中心保持的UTC （NTSC）时频信号和卫星共视时间比对方法，搭建了一套UTC （NTSC）远程复现系统，用于实现远程用户时间频率校准并能在远程恢复出UTC （NTSC）的时间频率信号。研究了基于UTC （NTSC）的时间频率远程复现方法，该方法基于改进的卫星共视法，可实现对用户本地参考时间与可视卫星钟的钟差进行连续实时监测，去除了传统共视时间传递方法中每个观测周期内的观测死时间；设计并实现了UTC （NTSC）远程复现系统，系统包括基准终端、配送终端和数据分析处理中心，基准终端测量UTC （NTSC）与可视卫星钟的钟差；配送终端测量本地原子钟与可视卫星钟的钟差，并在本地驾驭生成与UTC （NTSC）同步的时频信号；数据处理中心处理来自基准终端和配送终端的数据；评估了系统测量的不确定度，得出零基线条件下，系统授时精度达到0.8 ns；另外，通过对各远程用户不同类型钟的驾驭情况，得出铯钟的频率测量天稳达到2.84×10-14，铷钟的频率测量天稳达到8.24×10-14
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