Study On The Application Of The Ground-based GPS Inversion Of Atmospheric Precipitation And Typhoon Analysis

Ground-based GPS inversion of atmospheric precipitation as a new atmospheric detection technology,which was extensive used and researched in Meteorological science,GNSS remote sensing area.Because of its high precision,high space-time resolution,near-time observation and other characteristics,it get much more attention.This technology is more and more important to the research in application of Atmospheric Sciences,such as numerical weather forecast,weather characteristics of the changes and so on.Based on the observation data of SatRef,this paper focuses on the problems involved in the process of Ground GPS inversion of atmospheric precipitation and the changes of water vapor under the influence of typhoon.The main research contents are as follows:(1)Elaborated the fundamental of Ground-based GPS inversion of atmospheric precipitation.In order to analyze the adaptability of the models of weighted average temperature,taking Nanchang as the experimental area,use the sounding station data of Nanchang to modeled the weighted average temperature model,and compared with other models.furthermore,according to the principle of the precipitation which calculated by sounding data,analyzed the problems that should be paid attention to in the process of solving.(2)Analysis and discussion on the problem of model selection in GPS retrieval,evaluated the accuracy and applicability of the model of Saastamoinen,Hopfield and Black.In addition,use the observation data of IGS,and take the ITRF08 frame coordinates and the ZPD product provided by CODE as the true value,comparison of positioning accuracy and tropospheric delay which counted by the model of NMF,GMF and VMF1.The results show that the accuracy of GMF and VMF1 in U direction and tropospheric delay is equivalent to that of NMF model.Finally,analyzed the influencing factors which affect tropospheric delay calculation.(3)According to the process of Ground-based GPS inversion of atmospheric precipitation,combined with the observation data of SatRef,,using GAMIT software to solve,get the precipitation over the station.compared with the true value which calculated by sounding station data.The results which get from analysis in the influencing factors of precipitation show that the precipitation error in Hong Kong caused by the tide correction is between 1-3 mm,almost no impact on the inland station.Secondly,the accuracy of the IGR and the IGS is quite constant,The maximum difference is 1.100 mm while use the IGU to calculate,but with the increase of the observation time,the accuracy of the IGU is improved.,which satisfies the requirement of real-time numerical forecast.Compared with the Hopfield model and the Black model,the Saastamoinen model is more suitable for the Hong Kong region,and the GPT model is more suitable than the EGNOS while the meteorological data was missed.analyzed the accuracy of the GPS_GLONASS system,although the accuracy of the integrated navigation system is inaccurate,but it is weaker than that of Ground-based GPS inversion of atmospheric precipitation.(4)Based on the data of the SatRef,the satellite cloud and the actual rainfall distribution information provided by the Hong Kong Observatory,to analyzed the precipitation in Hong Kong while typhoons affected.Combining the characteristics of meteorological parameters such as temperature,air pressure and relative humidity during typhoon,it can be better used in typhoon forecast and analyze...