地基GPS水汽反演及应用分析

Research on GROUND-BASED GPS Atmospheric Water Vapor Retrieval and Analysis on Its Application

使用中国香港地区的连续观测站和相应探空数据进行地基GPS水汽反演及PWV拟合并对结果进行分析。研究表明:地势拟合模型的H误差在1 km以内的情况下能够保证PWV的精度在1 mm以内。PWV拟合模型的平面梯度因子对PWV拟合结果的精度没有显著影响。从PWV拟合时序图中可以发现,PWV拟合方法能够弥补因GPS观测站不足而造成的水汽缺失问题,并可查看水汽运动、变化等情况。

This thesis carries out an experiment of the ground-based GPS water vapor retrieval and PWV fitting by use of obsmw-ation data from continuous GPS sites in Hong Kong, China, and sounding data from NCEP. The study shows that when the tmwain fitting model bias of H is under 1 kin, the PWV bias could be under 1 mm. The thesis found that planar gradient factors of PWV fitting models improved little accuracy of PWV results. According to the PWV fitting sequence diagram, we found that the PWV fitting method not only solves the missing data because of deficient GPS sites but also has good results which could judge the trend and variation of water vapor obviously.