利用美国南加州地区多个IGS站4年天顶对流层延迟(ZTD)数据,建立了一种不需要实测气象参数而只与测站高程和年积日有关的区域天顶对流层延迟模型。新模型与基于ECMWF再分析资料和年平均气象参数下的Saastamoinen模型相比,其稳定性和精度都优于Saastamoinen模型,且模型精度随高程的增加而增加。使用新模型预测2012年南加州地区ZTD,其整体精度约为3.86cm。
In this paper,a new zenith tropospheric delay correction model is established by 4 years of ZTDs from IGS over Southern California,not requiring any meteorological data but related to the site elevation and the day of year.The new model is compared with the Saastamoinen model by ECMWF data and annual average me-teorological parameter when calculated the ZTD.The results show that the stability and precision of the new model are better than Saastamoinen model,and the precision increases with site elevation.The overall accuracy of the new model is about 3.86 cm when used to predict zenith troposhperic delays in 2012 in Southern Califor-nia.