BDS-3 B1C/B2a长基线相对定位研究  

Research on BDS-3 B1C/B2a long baseline relative positioning

作　　者：方卓 王立诗云 MICHAEL Floyd FANG Zhuo;WANG Lishiyun;MICHAEL Floyd(Nanjing Shuwei Surveying andmapping Co.,Ltd.,Nanjing 211808,China;China Railway Siyuan Group Nanning Survey and Design Institute Co.,Ltd.,Nanning 430007,China;Massachusetts Institute of Technology Department of Earth,Atmospheric and Planetary Sciences,Cambridge 02139,USA)

机构地区：[1]南京数维测绘有限公司,江苏南京211808 [2]中铁四院集团南宁勘察设计院有限公司,广西南宁430007 [3]麻省理工学院地球、大气与行星科学系,马萨诸塞州剑桥02139

出　　处：《测绘通报》2024年第8期31-36,53,共7页Bulletin of Surveying and Mapping

基　　金：国家自然科学基金(42271106;42071221)。

摘　　要：为了验证北斗三号卫星导航系统(BDS-3)B1C/B2a长基线相对定位的精度,本文首先对2023年DOY(304~313)澳大利亚地区8个MGEX测站连续10 d观测数据进行质量分析;然后使用改进的GAMIT10.76软件对观测数据进行长基线相对定位解算;最后评估BDS-3和GPS不同频点信号组合数据质量和双频无电离层线性组合基线解算,以及网平差的精度。试验结果表明,B1C/B2a、B1C/B2b和B1C/B3I频点信号组合数据质量、载噪比和伪距多路径误差基本相当,优于L1/L2;B1C/B2a的标准化均方根(NRMS)略优于B1C/B2b和L1/L2,显著优于B1C/B3I;B1C/B2a和B1C/B2b模糊度固定率基本相当,显著优于B1C/B3I,差于L1/L2。试验结果进一步表明,B1C/B2a相对于B1C/B3I的基线分量东(E)、北(N)和天顶(U)3方向标准差(STD)均值和三维点位误差均值分别降低了29.4%、27.0%、30.0%和41.0%。To verify the accuracy of the long baseline relative positioning of B1C/B2a signals from the BeiDou-3 Navigation Satellite System(BDS-3),this study firstly conducts a data quality analysis of the continuous 10day observation data from 8 Multi-GNSS experiment(MGEX)stations in the Australian region for day of year(DOY)(304~313)in 2023.Then,an improved GAMIT 10.76 software is used to perform long baseline relative positioning solutions on the observation data.Finally,the quality of theBDS-3 and GPS signal combination data at different frequency points and the accuracy of dual-frequency ionosphere-free linear combination baseline solutions and network adjustments are evaluated.The experimental results show that the data quality,signal-to-noise ratio,and pseudorange multipath error of B1C/B2a,B1C/B2b,and B1C/B3I frequency signal combinations are comparable and superior to the L1/L2.The normalized root mean square(NRMS)of the B1C/B2a is slightly better than that of B1C/B2b and L1/L2 frequency points,significantly superior to the B1C/B3I.The ambiguity fixing rate of B1C/B2a and B1C/B2b is basically the same,significantly superior to the B1C/B3I,but inferior to the L1/L2.Furthermore,the experimental results indicate that compared to the B1C/B3I,the average standard deviation(STD)of the baseline components east(E),north(N),and up(U)and the average 3D positioning error of B1C/B2a are reduced by 29.4%,27.0%,30.0%,and 41.0%,respectively.

关 键 词：北斗三号卫星导航系统 频点信号 数据质量 相对定位 

分 类 号：P228[天文地球—大地测量学与测量工程]