ON TROPOSPHERIC ZENITH TOTAL DELAY SOLVED BY GPS DATA

The tropospheric zenith total delay over Antarctic Great Wall station are solved by GAMIT / GLOBK software in both cases such as the different ephemeris,the different phase center of GPS receiver antenna.The solving results are analyzed to draw that eccentric phase center of GPS receiver antenna has a greater impact on the solving results and the zenith total delay solved by the forecasting ephemeris and precise ephemeris data are almost same.Therefore,it is a useful significance for high-precision positioning and real-time weather forecast.