GNSS对流层延时映射函数影响分析比较研究  

Anlysis of Influence of Mapping Function on GNSS Tropospheric Delay

作　　者：高兴国[1] 刘焱雄[1] 冯义楷[1] 彭琳[1] 

机构地区：[1]国家海洋局第一海洋研究所工程院,青岛市仙霞岭路6号266061

出　　处：《武汉大学学报（信息科学版）》2010年第12期1401-1404,共4页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金资助项目(40745025);国家863计划资助项目(2009AA12Z127);海洋公益性行业科研专项经费资助项目(200705003)

摘　　要：根据渤海湾三维气象场数据计算得到的映射函数值,比较了Marini连续映射函数、NMF和VMF1三类典型的映射函数在不同高度、不同方位产生的投影误差,以及对同一测站点位精度的影响。比较结果表明,在不同高度角下各函数的投影值之间出现微小差异;高度角越小,其相对误差越大。在5°高度角方向,VMF1模型相对误差最大仅为4%,得到的基线精度最高,解算基线后的NRMS为0.209 1周,明显优于NMF、Marini模型。考虑到水汽的时变特性,水汽分布的不均匀性是研究如何提高映射函数精度时不可忽略的关键因素。Based on the mapping function values derived from numerical weather model data（NWM）,we compared the projection errors and baseline＇s precision produced by Marini,NMF and VMF1 mapping function model at different elevation angles and azimuths.The results show that mapping values are slightly different,and relative errors gradually increase with the decrease of elevation angle.It implies that the maximum relative error of VMF1 is only 4% when the elevation angle is 5° and the precision of baseline produced by VMF1 is the highest.The NRMS of VMF1 is 0.209 1,which is much lower than NMF and Marini model.Considering time-changing property of water vapor,asymmetric distribution of water vapor is the key factor to improve the precision of mapping function.

关 键 词：对流层延时 映射函数 数值气象模式 

分 类 号：P228.41[天文地球—大地测量学与测量工程]