多模型融合对流层对精密单点定位影响分析  

Analysis of the influence of multi-model fusion tropospheric on precise single-point positioning

作　　者：马仪 王一帆 王国芳 余蓓蓓 袁运斌 MA Yi;WANG Yifan;WANG Guofang;YU Beibei;YUAN Yunbin(Electric Power Research Institute of Yunnan Power Grid Co.,Ltd.,Kunming 650217,China;State Key Laboratory of Geodesy and Geodynamics,Academy of Precision Surveying Science and Technology Innovation,Chinese Academy of Sciences,Wuhan 430063,China)

机构地区：[1]云南电网有限责任公司电力科学研究院,昆明650217 [2]中国科学院精密测量科学与技术创新研究院、大地测量与地球动力学国家重点实验室,武汉430063

出　　处：《测绘科学》2024年第8期51-59,共9页Science of Surveying and Mapping

基　　金：中国南方电网云南电网有限责任公司科技项目(YNKJXM20220033)。

摘　　要：针对精密单点定位中对流层延迟误差的修正问题,该文在传统建模的基础上,提出多模型融合的对流层天顶延迟策略,包括气象文件、实测气象参数与全球压力和温度(GPT3)组合、VMF1格网、VMF1台站文件,并比较定位精度。相同的天顶延迟策略前提下,分析映射函数GMF、NMF、VMF1、VMF3对定位精度的影响。实验结果表明,实测气象参数与Saas模型组合计算的对流层天顶延迟(ZTD)精度较GPT3提升约9.3%,较气象文件提升约33.6%。VMF-1格网U向精度最好,均方根(RMS)为3.94 cm,较气象文件提高14%,GPT3模型提高6%。当天顶延迟改正策略相同,映射函数在U向精度的差异约1 mm。因此,天顶延迟相比映射函数,对精密单点定位(PPP)精度影响更大。本文提出的气象文件和模型结合估计天顶延迟并实现PPP解算,ZTD精度相比GPT3有一定提升,定位精度相当。In view of the accuracy problem of the correction estimation,on the basis of traditional modeling,a tropospheric zenith delay strategy based on the traditional modeling was proposed in this paper,including meteorological file,measured meteorological parameters combined with global pressure/temperature 3(GPT3),Vienna mapping function 1(VMF1)grid and VMF1 station file,and the positioning accuracy was compared.Under the premise of the same zenith delay strategy,the influence of mapping functions global mapping function(GMF),Neill mapping function(NMF),VMF1 and VMF3 on positioning accuracy was analyzed.Experimental results showed that the accuracy of zenith tropospheric delay(ZTD)calculated by the combination of measured meteorological parameters and Saas model was about 9.3%higher than that of GPT3 and about 33.6%higher than that of meteorological documents.VMF-1 grid had the best U-direction accuracy,with the root mean square(RMS)of 3.94 cm,which was 14%higher than that of the meteorological document and 6%higher than that of the GPT3 model.The top-of-the-day delay correction strategy was the same,and the difference in the accuracy of the mapping function in the U direction as about 1 mm.Therefore,the zenith delay had a greater impact on the precision point positioning(PPP)accuracy than the mapping function.The meteorological file and model proposed in this paper combined the estimation of zenith delay and the realization of PPP solution,and the ZTD accuracy was improved compared with GPT3,and the positioning accuracy was comparable.

关 键 词：精密单点定位(PPP) 多模型融合 天顶对流层延迟 映射函数 

分 类 号：P228[天文地球—大地测量学与测量工程]