GNSS星载原子钟在轨性能评估技术进展  

Technical Progress of Performance Evaluation for GNSS On-Board Atomic Clocks

作　　者：黄观文[1,2] 曹钰 谭粤 谢威 HUANG Guanwen;CAO Yu;TAN Yue;XIE Wei(College of Geology Engineering and Geomatics,Chang’an University,Xi’an 710054,China;Key Laboratory of Ecological Geology and Disaster Prevention,Ministry of Natural Resources,Xi’an 710054,China)

机构地区：[1]长安大学地质工程与测绘学院,陕西西安710054 [2]自然资源部生态地质与灾害防控重点实验室,陕西西安710054

出　　处：《测绘地理信息》2024年第1期20-28,共9页Journal of Geomatics

基　　金：陕西省重点研发计划(2022ZDLSF07-12);中央高校基本科研业务费专项资金项目(CHD300102262715);长安大学研究生科研创新实践项目(300103723011);中央高校基础科学研究项目(CHD300102269305,CHD300102261301,CHD300102263502)。

摘　　要：星载原子钟作为全球导航卫星系统(global navigation satellite system,GNSS)的核心载荷,其在轨性能指标决定着GNSS的PNT服务水平。由于太空电磁环境复杂,原子钟实际工作指标不稳定,对星载原子钟开展长期持续性能评估就显得尤为重要。本文综述了目前星载原子钟评估技术现状,对相位、频率、频率漂移率、拟合精度、拟合残差、频率稳定度等性能评估指标进行了分析总结,归纳了基于精密钟差产品进行星载原子钟评估的数据处理方法和流程,统计了现阶段GNSS星载原子钟类型和指标水平,并采集一年的精密卫星钟差数据对GNSS星载原子钟进行了综合评估与对比分析。最后,对现阶段GNSS星载原子钟性能评估技术现状和问题进行了总结及展望。As the core payload of global navigation satellite system(GNSS),the performance of atomic clock in orbit de⁃termines the quality of positioning,navigation and timing(PNT)services.Due to the complex electromagnetic envi⁃ronment in space and the unstable operating indicators of atom⁃ic clocks,it is particularly significant to conduct sustained per⁃formance evaluation of atomic clocks in-orbit.The current status of evaluation technology for satellite clocks is summa⁃rized in this paper,and the evaluation indicators such as phase,frequency,frequency drift,fitting precision and fre⁃quency stability are analyzed and summed up.In addition,the data processing method of satellite clock evaluation based on high-precision clock offset products is explained.The types and status of GNSS satellite clocks in-orbit are illustrated,comprehensively evaluated and compared based on the precise clock offset products of 2021.Finally,the status and issues of GNSS satellite clocks performance evaluation technology are summarized and projected.

关 键 词：GNSS 星载原子钟 性能评估 钟差模型 稳定度 

分 类 号：P228[天文地球—大地测量学与测量工程]