不同对流层映射函数对多模GNSS实时PPP-AR性能影响  

The effects of different tropospheric mapping functions for multi-GNSS realtime precise point positioning with ambiguity resolution performance

作　　者：余治河 方卓 彭源芳 YU Zhihe;FANG Zhuo;PENG Yuanfang(Chongqing Academy of Surveying and Mapping,Chongqing 401123,China;Technology Innovation Center for Spatio-Temporal Information and Equipment of Intelligent City,Ministry of Natural Resources,Chongqing 401123,China;Nanjing Shuwei Surveying and Mapping Co.,Ltd.,Nanjing 211808,China;College of Automation and Electronic Information,Xiangtan University,Xiangtan 411105,China)

机构地区：[1]重庆市测绘科学技术研究院,重庆401123 [2]自然资源部智能城市时空信息与装备工程技术创新中心,重庆401123 [3]南京数维测绘有限公司,南京211808 [4]湘潭大学自动化与电子信息学院,湘潭411105

出　　处：《全球定位系统》2025年第1期18-24,共7页Gnss World of China

基　　金：国家自然科学基金(42271106,42471301)。

摘　　要：对流层映射函数对精密单位定位(precise point positioning,PPP)模糊度固定(ambiguity resolution,AR)的影响不容忽视.通过国际GNSS服务(International GNSS Service,IGS)的网络差分实时传输协议分发服务器的挂载点OSBC00WHU1接收了武汉大学实时精密轨道、卫星钟差、地球自转参数及原始观测值信号偏差(observable-specific signal bias,OSB)产品,结合澳大利亚地区均匀分布的11个多模GNSS实验跟踪网(Multi-GNSS Experiment,MGEX)测站观测数据,研究了尼尔映射函数(Niell mapping function,NMF)、全球映射函数(global map function,GMF)、维也纳映射函数1(Vienna mapping functions 1,VMF1)和维也纳映射函数3(Vienna mapping function,VMF3)四种对流层映射函数对北斗卫星导航系统(BeiDou Navigation Satellite System,BDS)、BDS/GPS、BDS/GPS/Galileo实时PPP-AR性能影响.实验结果表明:四种对流层映射函数对BDS、BDS/GPS、BDS/GPS/Galileo实时PPP-AR性能影响较小.使用GMF和VMF3对流层映射函数实时PPP-AR性能基本相当,优于NMF和VMF1.动态和静态模式BDS实时PPP-AR在东(E)和北(N)方向上平均定位精度基本相当,约为1.0 cm;在天(U)方向上平均定位精度存在明显差异,约为3.5 cm和2.6 cm.BDS/GPS/Galileo实时PPP-AR平均定位精度相比BDS整体提升较大;相比BDS/GPS整体提升较小.The effects of tropospheric mapping functions on the precise point positioning with ambiguity resolution(PPP-AR)should not be neglected.Real-time data for Wuhan University’s precise orbits,satellite clock biases,earth rotation parameters,and observable-specific signal bias(OSB)products were received through the international GNSS service(IGS)NTRIP client mount point OSBC00WHU1.The data were combined with observations from 11 multi-GNSS experiment(MGEX)stations distributed in Australia.The study investigated the effects of four tropospheric mapping functions,including Niell mapping function(NMF),global mapping function(GMF),Vienna mapping function 1(VMF1),and Vienna mapping function 3(VMF3)for real-time PPP-AR performance of the BeiDou navigation satellite system(BDS),BDS/GPS,and BDS/GPS/Galileo.The experimental results showed that the four tropospheric mapping functions had minimal effects for real-time PPP-AR performance of BDS,BDS/GPS,and BDS/GPS/Galileo.The use of GMF and VMF3 provided comparable real-time PPP-AR performance,outperforming NMF and VMF1.The average positioning accuracy of BDS real-time PPP-AR in the dynamic and static modes is generally comparable in the east and north directions,both around 1.0 cm.However,there is a significant difference in the average positioning accuracy in the up direction,approximately 3.5 cm and 2.6 cm,respectively.The average positioning accuracy of BDS/GPS/Galileo real-time PPP-AR shows a significant improvement more than BDS,while the improvement more than BDS/GPS is relatively small.

关 键 词：对流层映射函数 GNSS 精密单点定位(PPP) 模糊度固定(AR) 

分 类 号：P228.4[天文地球—大地测量学与测量工程]