多系统PPP天顶对流层延迟时空序列精度评估及分析  

Accuracy Evaluation and Analysis of Spatiotemporal Sequence of Zenith Tropospheric Delay in Multi-System PPP

作　　者：张智超 王乐[1] 刘国林 陈世通 黄观文[1] ZHANG Zhichao;WANG Le;LIU Guolin;CHEN Shitong;HUANG Guanwen(School of Geological Engineering and Geomatics,Chang’an University,Xi’an 710054,China)

机构地区：[1]长安大学地质工程与测绘学院,西安市710054

出　　处：《大地测量与地球动力学》2024年第7期698-703,共6页Journal of Geodesy and Geodynamics

基　　金：陕西省重点研发计划(2021LLRH-06-01-06,2022KW-09);长安大学优秀博士学位论文培育资助项目(300102263718)。

摘　　要：利用2021-09全球80个MGEX测站进行PPP实验,以国际GNSS服务组织(IGS)发布的ZTD产品为参考进行比较分析。结果表明,多系统联合估计ZTD在精度上具有较大优势,GPS+BDS双系统比单GPS系统平均RMSE精度提高约0.6 mm, GPS+BDS+GLONASS+Galileo四系统比双系统精度提高约0.9 mm,单系统条件下GPS的ZTD估计精度高于BDS。在精度空间分布上,随着纬度升高ZTD估计精度提升较为明显,当纬度大于50°时,四系统PPP估计的ZTD精度优于5 mm。在纬度基本不变的情况下,观测站海拔升高可提升ZTD估计精度。在模糊度固定的情况下,ZTD估计精度明显提升,单GPS系统估计ZTD的平均绝对误差(MAE)和均方根误差(RMSE)分别为7.6 mm和8.4 mm,相比于浮点解分别提高约11%和12%,平均收敛时间加快20 min。We conduct PPP experiments using 80 global MGEX stations in September 2021,and compare the results with ZTD product released by the international GNSS service(IGS)as a reference.The results reveal significant advantages in ZTD accuracy of multi-system joint estimation.The average RMSE accuracy of GPS+BDS dual-system is approximately 0.6 mm higher than that of single GPS system,while the GPS+BDS+GLONASS+Galileo four-system exhibits a further improvement of about 0.9 mm than dual-system.The ZTD estimation accuracy of GPS under single-system condition is higher than that of BDS.In terms of spatial distribution,the improvement of ZTD estimation accuracy is more significant with increasing latitude.The four-system PPP ZTD accuracy is better than 5 mm when latitude exceeds 50°.Moreover,elevation increase of observation stations can improve ZTD estimation accuracy while latitude remains unchanged.The ZTD estimation accuracy is significantly improved under ambiguity resolution.The average absolute error(MAE)and root mean square error(RMSE)of ZTD estimated by single GPS system are 7.6 mm and 8.4 mm,respectively,which are about 11%and 12%higher than floating-point solutions.The average convergence time is reduced by 20 minutes.

关 键 词：精密单点定位 天顶对流层延迟 模糊度固定 时空序列 

分 类 号：P228[天文地球—大地测量学与测量工程]