Research on Method of Calculating Zenith Dry Delay in GPS Measurement

Atmospheric precipitation were estimated to be the foundation of one of the main GPS meteorology research.This paper introduces the measurement of atmospheric refra-ction on the impact of GPS,outlined two kinds of commonly used dry zenith delay component model Saastamoinen model and the Hopfield model and the characteristics of various models and the scope of application.Of Beijing,Urumqi,Lhasa three IGS stations preliminary meteorological data processing and analysis,compared the more commonly used dry zenith delay component model.