增强罗兰授时差分站的时间统一技术  

Time synchronization technology for eLoran differential enhanced stations

作　　者：刘娅[1,2,3] 樊多盛 陈瑞琼 赵志雄[1,2] 孟令达[1,2] 郭伟[1] 李孝辉[1,2,3] 张首刚[1,2,3] LIU Ya;FAN Duo-sheng;CHEN Rui-qiong;ZHAO Zhi-xiong;MENG Ling-da;GUO Wei;LI Xiao-hui;ZHANG Shou-gang(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;Key Laboratory of Time and Frequency Primary Standards,Chinese Academy of Sciences,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院时间频率基准重点实验室,西安710600 [3]中国科学院大学,北京100049

出　　处：《时间频率学报》2021年第4期279-287,共9页Journal of Time and Frequency

基　　金：国家自然科学基金天文联合资助项目(U2031125);陕西省自然科学基金资助项目(2018ZDXM-GY-011)。

摘　　要：差分技术能将增强型罗兰授时系统微秒量级授时准确度提升至100 ns以内,原理是利用分布全国的差分增强站生成罗兰授时偏差修正量并实时广播给用户。授时偏差修正量的产生需要各差分增强站的时钟信号溯源至标准时间且保证与标准时间偏差小于10 ns(68.26%)。为满足这一工程建设需求,本文提出了一种基于标准时间复现技术的分布式节点时间同步方案,该方案具有低成本、高可靠、高精度、无人值守等工程应用特点,可以满足覆盖我国国土区域的应用需求。为检验该方案,建立了试验系统,在零基线、短基线和长基线等试验条件下均能获得与标准时间UTC(NTSC)偏差小于10 ns(95.44%)的信号,同时还能实时提供该信号与标准时间的偏差值,为系统完好性自主监测提供支持。The accuracy of time service for eLoran can be improved to more than 10 times by using differential technology, this depends on the Loran time service deviation information which generated by the differential enhancement stations distributed all over the country. The accuracy of time service accuracy for eLoran system is expected to be better than 100 ns. The generation of deviation information requires that the clock signal of each differential enhancement station has the characteristics of tracing to the UTC(k), and the time difference from UTC is less than 10 ns 68.26%). In order to meet the requirements of project, this study proposed a distributed node time synchronization scheme based on the standard time regenerate technology, which has the characteristics of engineering projects, including low cost, high reliability, high precision, automatic operation and so on. It can support the application in China. A test system was established for the validation. The results from the zero baseline,short baseline and long baseline tests shown that the equipment can output signals with a deviation of less than 10 ns(95.44%) from the UTC(NTSC), and it can also provide real-time time deviation values. The time deviation value can support the system to realize autonomous integrity monitoring.

关 键 词：eLoran授时 差分增强站 时间同步网 纳秒级时间同步 时间溯源 

分 类 号：P127.1[天文地球—天体测量]