UTC(NTSC)远程高精度复现方法研究及工程实现

Research on high precision method for remotely reproducing UTC(NTSC) and its realization

中国科学院国家授时中心建立了与协调世界时(UTC)同步的UTC(NTSC),为了能让更多用户使用溯源到UTC的高精度时间频率信号,开发了UTC(NTSC)远程高精度复现系统,解决了标准卫星共视方法测量存在间断,且不能实时输出比对结果的问题。试验表明,复现时间与UTC(NTSC)偏差小于2 ns,频率准确度优于1×10^(-15)。详细介绍了UTC(NTSC)远程高精度复现系统的工作原理和实现方法,以及为提高复现精度、增强系统可靠性采用的技术手段。

The NTSC（the national time service center, the Chinese academy of sciences） has established and maintained the UTC（NTSC）, a local universal time coordinated, which is synchronized with the UTC. In order to allow more users to acquire the high precision time and frequency signal which is traceable to UTC, we have developed a high precision system for remotely reproducing UTC（NTSC）. This system can solve some problems such as that there is dead time for the standard satellite common view measuring and there is no real-time output of comparison results. A recent experiment demonstrated that the time offset of reproduced time is less than 2 ns compared with UTC（NTSC） and the frequency accuracy is better than 1×10^-15. The principle and implement of the system for remotely reproducing UTC（NTSC） with high precision are introduced in detail, and the adopted techniques for improving the reproducing precision and enhancing the reliability are demonstrated.