Study on Tropospheric Zenith Delay Solved by GPS Data

The tropospheric zenith delay of Great Wall station in Antarctic grouped with surrounding IGS stations is solved by GAMIT/GLOBK software using GPS observational data. In the process of solving, IGS final ephemeris and precision forecast ephemeris are used to solve the zenith delay in the software. The solutions are analyzed to draw some conclusions. The results show that the zenith delay of different stations solved by the two kinds of ephemeris data at the same time is almost same. The differential minimum is 0 mm and the differential maximum is 0.5 mm. Therefore, the precipitable water vapor content over the GPS stations may be directly acquired by precision forecast ephemeris in this software. It is a useful significance for detecting water vapor content on real time and real-time weather forecast.