201 Study on the Best Number of IGS Stations for Grouping Network

There have been many flood disasters and geological disasters of landslides and mudslides caused by weather disasters. Especially, Short-term adverse weather conditions have a direct impact on geological disasters. The weather data source of high-precision on real time can be provided by GPS technology. At the same time, the high-precision and real-time weather forecast can provide important and basic information for geological disasters monitoring, forecasting and prevention. However, the precision of the total zenith delays in troposphere directly affects the estimating precision of the water vapor contents on stations, then, affects the accuracy of real-time weather forecast in the application of GPS meteorology. In this paper, the total zenith delays of GPS observational station are solved respectively on GPS data of GPS observational station grouped with IGS stations of different number using high-precision software-GAMIT∕GLOBK developed by the Massachusetts Institute of Technology. The calculated results are comparatively analyzed and it is demonstrated that the best number of IGS tracking stations for improving the precision of the total zenith delays in troposphere was 3. It is of great realizable significance.