GPS反演大气综合水汽含量的影响因素分析

Analysis the influence factor of atmosphere precipitable water vapor by GPS reversion

目前地基GPS遥感大气综合水汽含量的可行性已经被众多实验所验证,为进一步改善地基GPS遥感大气综合水汽含量的精度,本文对2004年6月哈尔滨GPS跟踪站的观测数据进行了解算,并结合探空资料计算的水汽结果对各项误差进行了分析。结果表明:广播星历不能用于高精度GPS水汽遥感;5cm的测站坐标误差将引起3mm的水汽误差,截止高度角的不同以及通用模型均会对水汽结果造成不同程度的影响。

Presently,the feasibility of remote sensing atmosphere precipitable water vapor based on ground-based GPS has being validated by many experimentation.In order to improve the precision of remote sensing atmosphere precipitable water vapor by GPS,the observational data from Harbin GPS tracking station on June 2004 are processed in this paper,and the errors of precipitable water vapor are analyzed combining with the results of radio sound water vapor.The con-trastive results show that broadcast ephemeris can not be used in high precision GPS/VAPOR,and 5cm coordinates errors will bring 3mm precipitable water vapor errors.At the same time,different cut-off elevation and universal model also have different degree influence on the results of precipitable water vapor.