基于iGMAS的亚纳秒级实时时间服务系统设计与实现  

Design and implementation of sub nanosecond real time time service system based on iGMAS

作　　者：武美芳[1] 董孝松 WU Mei fang;DONG Xiao song(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;Shandong University of Technology,Zibo 255000,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]山东理工大学,淄博255000

出　　处：《时间频率学报》2022年第4期262-269,共8页Journal of Time and Frequency

基　　金：国家自然科学基金青年科学基金资助项目(12003041);中国科学院“西部之光”人才培养计划“西部青年学者”B类资助项目(XAB2018B19)。

摘　　要：全球导航卫星系统(GNSS)时间服务精度为10~50 ns,是目前广泛使用和精度较高的时间服务技术之一。现代信息社会的快速发展,对时间服务精度和时效性提出了更高的要求。鉴于此,本文设计并实现了基于国际GNSS监测评估系统(iGMAS)的亚纳秒级实时时间服务系统。该系统由跟踪网、服务平台、播发平台和用户平台组成。系统工作原理为:以iGMAS作为平台,建立GNSS与UTC(NTSC)的紧密联系,用户通过多种定时模式,实时获得本地时钟与UTC(NTSC)的偏差,从而实现精密时间服务,预期静态时间服务精度达到亚纳秒量级。根据应用场景不同,用户可选择精密单点定位(PPP)定时模式或实时动态定时模式完成时间服务过程。测试表明,用户端采用PPP定时模式或实时动态定时模式,系统均可提供精度优于1 ns的时间服务。与GNSS时间服务相比,基于iGMAS的亚纳秒级实时时间服务系统将时间服务精度提高1~2个量级。The precision of GNSS based time service is typically 10~50 ns,which is one of the most widely used and precise time service technologies.With the rapid development of modern information society,the precision of tens of nanoseconds,however,can not meet the demands of diverse sources.Based on the above problems,a sub nanosecond real time time service system based on international GNSS Monitoring and Assessment System(iGMAS)is designed and implemented.The system consists of the tracking network,the service platform,the broadcast platform and the user platform.With the help of the iGMAS service,a close relationship between the GNSS based timing results and the UTC(NTSC)is established.Users can obtain the deviation between their local clocks and the UTC(NTSC)in real time through a variety of timing modes,so as to realize precision time service.It is expected that the static timing accuracy will reach the sub nanosecond level.According to different application scenarios,users can select precise point positioning(PPP)timing mode or real time kinematic timing mode to complete the time service process.The tests showed that when the user adopts PPP timing mode or real time kinematic timing mode,the prototype system can provide time service with precision better than 1 ns.Compared with the traditional GNSS based time service technology,the system improves the time service precision by 1~2 orders of magnitude.

关 键 词：国际GNSS监测评估系统 亚纳秒 时间服务 实时 UTC(NTSC) 

分 类 号：P127.1[天文地球—天体测量]