在介绍经验映射函数NMF和动态映射函数VMF1、GMF模型的基础上,利用ECMWF提供的格网数据,具体研究和分析了这3种映射函数1a中的时间变化特征及其随高程、纬度、高度角变化的特点,并比较了3种映射函数随高度角的变化对斜路径延迟估计的影响。
On the basis of introducing the empirical mapping function NMF and the dynamic mapping functions VMF1 and GMF,using one year's grid data provided by ECMWF,the time varying characteristics of these three mapping functions and their variations with height,latitude and elevation angle are concretely researched and analyzed are compared.Finally,we compare the influence on slant path delay with the variations of elevation angle in the three kinds of mapping functions are compared.