BDS-3与BDS-2基本服务性能对比分析  

Comparative analysis of basic service performance between BDS-3 and BDS-2

作　　者：贺延伟 贾小林[2,3] 刘家龙 许瑾 张锐斌 伏军胜 朱永兴 HE Yanwei;JIA Xiaolin;LIU Jialong;XU Jin;ZHANG Ruibin;FU Junsheng;ZHU Yongxing(School of Geological Engineering and Geomatics,Chang'an University,Xi'an 710054,China;Xi'an Institute of Surveying and Mapping,Xi'an 710054,China;State Key Laboratory of Geographic Information Engineering,Xi'an 710054,China)

机构地区：[1]长安大学地质工程与测绘学院,西安710054 [2]西安测绘研究所,西安710054 [3]地理信息工程国家重点实验室,西安710054

出　　处：《导航定位学报》2022年第1期20-28,75,共10页Journal of Navigation and Positioning

基　　金：国家自然科学基金项目(41874041)。

摘　　要：针对北斗三号(BDS-3)全面组网后的公开服务性能还没有较为完整的评价,通过比较BDS-3和北斗二号(BDS-2)的空间信号精度、电离层模型改正率和伪距单点定位精度来对BDS-3进行评估和分析。实验结果表明:1)BDS-3的空间信号测距误差、轨道误差以及钟差误差各项指标都优于BDS-2;2)BDS-3使用的北斗三号全球广播电离层延迟修正模型(BDGIM)的改正精度,在北半球略高于南半球,在亚太地区和全球的改正率分别为74%、71%,且BDGIM模型偏差整体优于BDS-2使用的北斗系统电离层模型(BDSK8)1~2个总电子含量单位(TECU);3)BDS-3的单频定位精度优于BDS-2,三维定位精度在4m以内,新频点(B1C、B2a)整体优于旧频点(B1I、B3I),个别站B1C频点的精度稍差。In view of the lack of complete evaluation of the public service performance of BeiDou-3 navigation satellite System(BDS-3)after the comprehensive networking,this paper evaluates and analyzes the system by comparing the spatial signal accuracy,ionospheric model correction and pseudo-range single point positioning accuracy of BDS-3 and BeiDou navigation satellite(regional)System(BDS-2).The experimental results show that:1)the spatial signal ranging error,orbit error and clock error of BDS-3 are better than those of BDS-2;2)The correction accuracy of BeiDou Global broadcast Ionospheric delay correction Model(BDGIM)used by BDS-3 is slightly higher in the Northern Hemisphere than that in the Southern Hemisphere,and the correction rates in the Asia-Pacific region and the world are 74%and 71%respectively,and the deviation of BDGIM is better than that of the BDS Klobuchar model(BDSK8)used by BDS-21-2 Total Electron Content Units(TECU)on the whole;3)the single-frequency positioning accuracy of BDS-3 is better than that of BDS-2,and the three-dimensional positioning accuracy is within 4 m.The new frequency points(B1 C,B2 a)are better than the old frequency points(B1 I,B3 I)on the whole,and the accuracy of B1 C frequency points of some stations is slightly worse.

关 键 词：北斗三号 空间信号测距误差 电离层模型改正 伪距单点定位 服务性能评估 

分 类 号：P228[天文地球—大地测量学与测量工程]