NIMDO-Based Precision Time and Frequency Traceability System
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摘要: 高准确度的时频传递系统是时间频率服务的重要组成部分,是连接我国时间频率基准到各级标准及时间频率用户之间的桥梁,对国民经济和国防建设有着举足轻重的作用。利用中国计量科学研究院研制的远程时间溯源装置—NIMDO,基于GNSS时间频率传递的可准实时验证的溯源或授时技术,建立精密时间频率溯源系统,实现远程时间频率源与原子时标国家计量基准UTC(NIM)的比对。通过系统验证及分析,NIMDO与UTC(NIM)时间偏差测量结果78.17%在±5 ns以内,相对频率偏差(一天平均)测量结果88.49%在±1×10−13以内。结果表明验证系统解决了精密时间频率溯源和同步问题。
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关键词:
- UTC(NIM)时间频率源 /
- 全球导航卫星系统 /
- 溯源系统 /
- 时间频率传递
Abstract: The high-accuracy time and frequency transfer system is an important component of time and frequency service and a bridge linking China's time and frequency reference to standards and time and frequency users at all levels, which plays a pivotal role in the national economy and national defense construction. Using the remote time traceability device - NIMDO developed by the National Institute of Metrology, and based on the quasi-real-time verifiable traceability or timing technology of GNSS time and frequency transfer, a precise time and requency traceability system is established to realize the comparison between the remote time and frequency source and UTC (NIM), the national measurement reference of atomic time scale. Through system verification and analysis, 78.17% of the time deviation between NIMDO and UTC (NIM) is within ±5 ns, and 88.49% of the relative frequency deviation (day average) is within ±1×10−13. The results showed that the system solved the problem of precise time-frequency traceability and synchronization. -
表 1 时间偏差数据统计
Table 1. Time deviation data statistics
观测站
(REF)观测
点数0 ns<|**|
<5 ns5 ns<|**|
<10 ns10 ns<|**|
<15 ns15 ns<|**|
<20 ns|**|
>20 nsTS26 27841 21763 3047 237 1015 1779 百分比 78.17% 10.94% 0.85% 3.65% 6.39% 表 2 频差偏差数据统计
Table 2. Frequency difference deviation data statistics
观测站
(REF)观测
点数0<|**|
<5×10−145×10−14
<|**| <10−1310−13<|**|
<2×10−13|**|
>2×10−13TS26 27841 20264 4373 765 2439 百分比 72.78% 15.71% 2.75% 8.76% -
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