Analysis  of Classical Tropospheric Models Based on Measured Meteorological Elements

Abstract

In response to the issue of varying correction accuracy for different tropospheric delay models, this article uses measured meteorological element data from 20 reference stations in China over the four quarters of 2022. The Hopfield model and Saastamoinen model are used to calculate the total zenith delay (ZTD) results of a single station in the troposphere, and compared with the ZTD results obtained from GNSS observation data，Comparative analysis was conducted in different regions, altitudes and seasons. The analysis results indicate that, overall, the Hopfield model is better than the Saastamoinen model, and this feature is more pronounced in high-altitude areas; The correction effect of each model is the best in winter and the worst in summer; The correction accuracy of each model in high latitude areas is significantly better than that in low latitude areas. In addition, it is recommended to use the Hopfield model to calculate the single station ZTD in low altitude and high latitude areas of China.