GPS反演可水量中的三种对流层延迟模型精度分析

Accuracy Analysis of Three Kinds of Tropospheric Delay Models in the GPS Inversion

利用GAMIT/GLOBK软件解算bjfs、shao、wuhn、twtf四个IGS站的数据,分别运用Hopfield、Saastamoinen、EGNOS模型,计算出测站shao的GPS大气可降水量,并结合气象数据,对三种不同对流层延迟模型在GPS探测大气可降水量中的精度进行了分析。结果表明,Saastamoinen模型的精度略高于Hopfield模型的精度,EGNOS模型精度好于Hopfield和Saastamoinen模型,但在气象条件变化剧烈时,其精度不如实测地面气象数据的Hopfield和Saastamoinen模型。

Calculating the data of four IGS station:bjfs,shao,wuhn and twtf by GAMIT/GLOBK software and using Hopfield,Saastamoinen and EGNOS models respectively to calculate the GPS atmospheric precipitation of shao station,and combine with the sounding data to analyze the accuracy of three different tropospheric delay models in the GPS detection of atmospheric precipitation.The results show:The accuracy of the Saastamoinen model is slightly higher than that of the Hopfield model,and the accuracy of the EGNOS model is better than that of the Hopfield and Saastamoinen models,however,in severe weather conditions,the accuracy of the EGNOS is not as good as that of the Hopfield and Saastamoinen models which use the measured data.