北斗卫星导航系统SISURE初步评估

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英文篇名：Preliminary Evaluation of SISURE of Beidou Satellite Navigation System 作者：谢慧 ; 宋淑丽 ; 焦国强 ; 黄超 ; 陈钦明 英文作者：XIE Hui;SONG Shu-li;JIAO Guo-qiang;HUANG Chao;CHEN Qin-ming;Shanghai Astronomical Observatory, Chinese Academy of Sciences;University of Chinese Academy of Sciences; 关键词：北斗导航系统 ; 精度评估 ; 轨道误差 ; 钟差误差 ; 空间信号用户测距误差 英文关键词：Beidou navigation system;;accuracy evaluation;;orbit error;;clock error;;signal in space user ranging error 中文刊名：TWXB 英文刊名：Acta Astronomica Sinica 机构：中国科学院上海天文台;中国科学院大学; 出版日期：2019-05-28 16:14 出版单位：天文学报 年：2019 期：v.60 基金：国家重点研发计划(2016YFB0501503-3);; 国家自然科学基金项目(11873079)资助 语种：中文; 页：TWXB201903008 页数：11 CN：03 ISSN：32-1113/P 分类号：96-106

摘要

北斗导航系统自2018年12月27日提供全球服务以来,其服务性能受到了极大关注.以上海天文台iGMAS (International GNSS Monitoring&Assessment System)分析中心发布的精密轨道、钟差产品作为基准,评估了2019年年积日3–12 d的北斗二号、北斗三号以及GPS广播星历的轨道、钟差和空间信号用户测距误差(Signal in Space User Ranging Error, SISURE,简称为URE),并且对北斗卫星导航系统结果进行了详细的分析.结果表明:在评估时间段内,北斗三号广播星历轨道精度、URE均明显优于北斗二号,且部分结果优于GPS.北斗三号广播星历轨道径向精度最高,优于0.2 m.北斗三号全部卫星URE均值优于0.4 m, URE RMS (root mean square)优于0.5 m.北斗二号每颗卫星URE均值、95%URE (置信度为95%的URE)、URE RMS小于2 m,北斗三号每颗卫星URE均值、95%URE、URE RMS小于1 m,均达到了系统公开承诺的服务性能标准.
        Since the Beidou navigation system provided a global service on 2018 December 27, its service performance has received great attention. Based on the precision products released by the iGMAS(International GNSS Monitoring & Assessment System) Analysis Center of Shanghai Astronomical Observatory, we evaluate the orbits,clock differences, and signal in space user ranging error(SISURE(URE)) of the Beidou-2, Beidou-3, and GPS during the day of year 3–12 of 2019, and analyze the results of the Beidou navigation system in detail. It is showed that the results of Beidou-3, including broadcast ephemeris orbit accuracy and URE, had an obvious superiority over Beidou-2 during the evaluated period. And a part of them were better than GPS.Meanwhile, Beidou-3 has the best broadcast ephemeris orbit accuracy in radial direction, less than 0.2 m. Its average URE was less than 0.4 m, and URE RMS was less than 0.5 m. The parameters, including average URE, 95%URE, and URE RMS, were less than 2 m in Beidou-2 and 1 m in Beidou-3, respectively, and all meet the service performance standards that the system publicly promises.

引文

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