对流层映射函数对精密单点定位的影响分析  

Influence analysis of tropospheric mapping functions on precise point positioning

作　　者：翟树峰[1] 吕志平[1] 崔阳[1] 王宁 ZHAI Shufeng;LU Zhiping;CUI Yang;WANG Ning(School of Geospatial Information, Information Engineering University, Zhengzhou 450002, Chin)

机构地区：[1]信息工程大学地理空间信息学院,河南郑州450052

出　　处：《测绘工程》2018年第1期24-30,共7页Engineering of Surveying and Mapping

基　　金：国家自然科学基金资助项目(41674019);国家重点研发计划(2016YFB0501701)

摘　　要：分析对流层映射函数(NMF、VMF1和GMF)对精密单点定位(PPP)精度的影响,对分布于南北半球不同纬度地区的IGS跟踪站的观测数据进行解算。首先比较PPP坐标与IGS发布的日解SNX文件坐标差异和模型间PPP坐标差异,然后分析不同季节对模型差异的影响。实验结果表明,3种映射函数均可提高PPP精度,精度控制在1cm左右。整体而言,VMF1和GMF对PPP精度的影响相当,且优于NMF。在不同季节里,模型差异会发生mm级的变化。Observations of IGS stations in different latitude areas in north and south hemisphere are computed in order to analyze the influence of tropospheric mapping functions on Precise Point Positioning （PPP）. Differences of PPP coordinates and daily SNX file coordinates issued by IGS and PPP coordinates between models are compared. Finally, the influence on the difference between models by seasons are analyzed. The result shows that three mapping functions can improve the PPP precision, in which the difference is small, GMF and VMF1 have the similar influence on the PPP precision, and both are better than NMF. In different seasons, the difference between models will change in the form of mm.

关 键 词：IGS 精密单点定位 对流层延迟 映射函数 精度 

分 类 号：P228[天文地球—大地测量学与测量工程]