GPS/BDS-3基线解算中海潮模型的影响分析

Influence analysis of tide model in GPS/BDS-3 baseline calculation

为了分析全球定位系统/北斗三号(GPS/BDS-3)长基线解算中海潮模型的影响,该文采用常用的NAO.99b、FES2004、FES2014海潮模型,分别对BDS-3和GPS基线解算进行标准化均方根误差(NRMS)、基线重复率和均方根误差对比分析。通过中国周边17个MGEX站7d数据测试表明:加入海潮模型后GPS/BDS-3的NRMS值均有提升,GPS基线重复性略优于BDS-3,均达到10-9;NAO99.b、FES2004、FES2014海潮模型对BDS-3内符合精度在N、E方向上提升不明显,U方向上分别提升6%、8.5%、9%,外符合精度在E方向上提升19%、23.8%、28.8%,在U方向上提升6.5%、5.5%、8%;GPS内符合精度提升不明显,外符合精度在N方向上提升1%、11.9%、12.2%,在E方向上精度相当,在U方向上提升2.3%、4.1%、5.1%。

In order to analyze the influence of sea tide model in GPS/BDS-3 long baseline calculation,the common sea tide models NAO.99b,FES2004 and FES2014 were used to carry out the comparative analysis of standardized root mean square error(NRMS),baseline repetition rate and root mean square error of BDS-3 and GPS baseline calculation respectively.The 7 d data test of 17 MGEX stations around China showed that the NRMS values of GPS/BDS-3 were improved after the addition of the tidal model,and the baseline repeatability of GPS was slightly better than that of BDS-3,reaching 1o-9.For NAO99.b,FES2004 and FES2014,the internal coincidence accuracy of BDS-3 was not significantly improved in the N and E directions,and was improved by 6%,8.5%and 9%in the U direction,respectively.The external coincidence accuracy was improved by 19%,23.8%and 28.8%in the E direction,and by 6.5%,5.5%and 8%in the U direction.The improvement of GPS internal coincidence accuracy was not obvious,but the improvement of GPS external coincidence accuracy was 1%,1l.9%and 12.2%in the N direction,the same accuracy in the E direction,and 2.3%,4.1%and 5.1%in the U direction.