A New Global Zenith Tropospheric Delay Model

In real-time navigation and positioning of the satellite,the zenith tropospheric delay model is used to decrease tropospheric delay by requiring meteorological parameters,but this requirement reduces the accuracy of the model.Therefore,we analyze the variation of troposphere in the elevation and the horizontal respectively on the global scale by requiring the high-precision zenith tropospheric delay data which come from IGS.Based on the analysis,we put forward a new zenith tropospheric delay model which can meet the need of the real-time positioning and navigation of the satellite.The reason is that not only the new model is simple as its input parameters are day of year and location of the station without meteorological parameters but also its accuracy is best compared with several commonly used models.