地基GPS网层析水汽三维分布数值积分方法  

A Water Vapor Tomographic Numerical Quadrature Approach with Ground-based GPS Network

作　　者：叶世榕[1] 江鹏[1] 刘炎炎[1] 

机构地区：[1]武汉大学卫星导航定位技术研究中心,湖北武汉430079

出　　处：《测绘学报》2013年第5期654-660,共7页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金(41074008);国家973计划(2012CB957701);国家863计划(2012AA12A202);高等学校博士学科点专项科研基金(20120141110025)

摘　　要：针对传统层析方法的缺点,结合数值积分参数化方法,设计并实现了一种顾及地球曲率的水平与垂直方向分开插值的地基GPS网层析湿折射率三维分布方法,简化了垂直插值的运算,减少了层析实际观测方程中零系数参数的比例。利用美国Dallas地区CORS网实测GPS数据与气象数据,结合位于该区域的FWD探空站探空数据提供的湿折射率垂直轮廓线,验证分析该方法用于实测数据的可行性及其精度。结果表明:相对于传统层析方法,该方法能够明显提高层析湿折射率垂直轮廓线的精度,与探空结果相比,其RMS、误差分布均优于传统方法,而且垂直内插方法的精度也略高于复杂的三次样条垂直内插方法。A new approach of ground-based GPS tomography for wet refractivity is presented,which uses numerical quadrature and respective interpolation in both horizontal and vertical direction with new interpolation formulas. And the earth curvature is considered in this method. Real GPS and meteorological data from CORS located in Dallas, U.S. were used to validate the new approach. Tomographic results of wet refractivity vertical profile by new and classic approaches were compared with the radio soundings results from FWD RS station. The research shows that new methods can get the wet refractivity vertical profile with higher precision and reliability as the RMS and error distribution are better than the classic method＇s. And precision of the new and more simple vertical interpolation function is slightly higher than the more complex spline one＊s.

关 键 词：水汽 层析 数值积分 湿折射率 

分 类 号：P228[天文地球—大地测量学与测量工程]