北斗/GNSS授时性能评估及结果比较分析  

Performance assessment and results comparison of BDS/GNSS timing

作　　者：朱琳[1,2,3] 张慧君 李孝辉[1,2,3] 刘音华[1,2,3] ZHU Lin;ZHANG Hui-jun;LI Xiao-hui;LIU Yin-hua(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Time Reference and Applications,Chinese Academy of Sciences,Xi’an 710600,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院大学,北京100049 [3]时间基准与应用重点实验室(中国科学院),西安710600

出　　处：《时间频率学报》2023年第4期289-297,共9页Journal of Time and Frequency

基　　金：中国科学院“西部之光”人才培养计划“西部青年学者”资助项目(XAB2021YN28)。

摘　　要：授时是全球卫星导航系统(GNSS)的三大服务功能之一。针对GNSS授时性能评价指标和评估方法不统一的问题,研究了评估北斗/GNSS授时性能的关键指标,提出了一种北斗/GNSS授时性能评估方法。该方法以中国科学院国家授时中心保持的协调世界时UTC(NTSC)和国际权度局(BIPM)发布的UTC为基础,评估导航系统的授时性能,同时给出了该评估方法的不确定度分析结果。利用位于国家授时中心的GNSS系统时间监测系统产生的数据,评估并比较分析了BDS、GPS、GLONASS以及Galileo的授时性能。结果表明,在2021年的评估周期内,BDS、GPS、GLONASS和Galileo的时间传递准确度分别为13.8、4.5、16.8和4.2 ns,均符合导航系统性能的承诺。Timing is one of the three major service functions of the Global Navigation Satellite System(GNSS).Aimed at the inconsistency of GNSS timing performance standards,the definition and assessment method of BDS/GNSS timing performance standards are discussed.The assessment methods are proposed based on the Coordinated Universal Time(UTC)kept by the National Time Service Center(UTC(NTSC))and UTC published by the Bureau International des Poids et Measures(BIPM).The uncertainty budget of the assessment method is given.The timing performance of BDS,GPS,GLONASS,and Galileo are assessed and compared using the data from the GNSS time monitoring system at NTSC.The assessment results show that,during the evaluation period of 2021,the time transfer accuracy of BDS,GPS,GLONASS and Galileo are 13.8,4.5,16.8 and 4.2 ns respectively,which meet their performance commitment.Furthermore,the timing performance of GPS and Galileo are much better than their system commitment,while the time transfer accuracy of BDS and GLONASS show systematic error characteristics and have much room for improvement.

关 键 词：全球卫星导航系统 授时性能 时间传递准确度 评估 

分 类 号：P127.1[天文地球—天体测量] P228.4[天文地球—天文学]