Application Of Ground GPS Retrieval In Atmospheric Precipitation In Hong Kong

Atmospheric water vapor content is one of the main research contents of GPS meteorology,the change of water vapor in the atmosphere is extremely fierce,and the dramatic changes in water vapor content have a great impact on the climate.When the water vapor content rises to a certain value,it can form rainfall.Many of the natural disasters are caused by rainfall,therefore,real-time detection of atmospheric water vapor content of natural disasters is important.Because of the technical error of the traditional detection of atmospheric water vapor content,GPS inversion atmospheric precipitation technology began to rise in the 1990 s,which has the advantages of high precision,high space-time resolution and all-weather observation,which makes up the traditional water vapor detection technology defect.This paper mainly studies the changes of atmospheric water vapor content from the following aspects:(1)the use of Bernese high-precision data processing software to solve the data collected in Hong Kong CORS network,extract the precipitation information,through the actual operation to find and solve the problems encountered in the data processing;(2)qualitative analysis of atmospheric precipitation factors,quantitative analysis of atmospheric precipitation error value.To explore how to obtain high-precision atmospheric water vapor content;(3)Study the characteristics of the regional weighted average temperature model to find out how to return to the weighted average temperature model applicable to Hong Kong;(4)A comparative analysis of different models of atmospheric precipitation can be made,including tropospheric delay model,weighted average temperature model,combined navigation model,IGS auxiliary station,satellite ephemeris and so on.The atmospheric precipitation can be obtained by using different models,and the airborne precipitation results Radio / PWV calculated by the sounding data are compared and analyzed respectively.To get the highest accuracy of the model;(5)Using the model with the highest accuracy obtained from the comparative analysis,the changes of the atmospheric water vapor content in the March event of March in Hong Kong were studied,and the trend of atmospheric precipitation in the event of heavy rain was obtained.To verify whether GPS atmospheric precipitation can be used for real-time rainstorm prediction.