高精度GNSS服务中对流层映射函数的影响性分析

Analysis of troposphere mapping function on high precision service

针对GNSS服务中如何获取高精度的大地高以及GNSS气象中对流层湿延迟项,文中采用3种试验方案,利用对流层变化复杂的香港区域CORS,分析不同映射函数在不同高度角时对精密服务的影响。结果表明:在高度角为15°时VMF1、GMF、NMF映射函数获取基线重复性相当,天顶延迟变化规律一致;在低高度角为10°时,基于VMF1映射函数的基线重复率更好,对大气变化的敏感性更强,GMF映射函数获取的天顶延迟精度较好,NMF映射函数获取的精度较弱。

As for the high precision geodeict height and troposphere wet delay, Hongkong CORS data are used to analyze the mapping function effection on precision service in different angle. The result shows that the baseline repeatation and the zenith variation are closed to each other at 15°elevating angle; the baseline repeatation based on the VMF1 mapping function scheme at 10°elevating angle are more better and more sensitive than others; the GMF mapping function accuaracy is middle; and the NMF mapping function are least weak.