The Research And Application Of GPS Sensing Of Atmospheric Water Vapor

With the increasingly sophisticated of ground-based GPS sounding technology andthe rapid development of GPS meteorology research, ground-based GPS soundingtechnology has become an effective means of atmospheric water vapor detection.Compared with traditional methods, ground-based GPS sounding technology hasadvantages such as high accuracy, wide coverage, all-weather continuous observationtime, high resolution and low cost. It has been great emphasis by the nationalmeteorological departments, atmospheric detection using GPS gradually to theoperational transition. But not yet fully reached the application stage, there are manytechnical problems to be solved.The subject has do some research on the principles and methods of ground-basedGPS atmospheric soundingbased on GPS meteorological monitoring networkconstruction project in Guangdong.Focuses on the operational ground-based GPSatmospheric sounding data processing in several major issues.The main researchcontents of the subject are as follows:1) Describes ground-based GPS atmospheric water vapor detection principle aswell as data processing method based on GAMIT software.2) Determinesthe best tropospheric model fit Guangdong regionthrough thecompare and analyze of different tropospheric models.3) Determinesthe best mapping function fit Guangdong region through the compareand analyze of different mapping functions.4) Establishes weighted mean temperature Tm of the localization model inGuangdong,based on radiosonde balloon data.5) Determines the operational use of ground-based GPS atmospheric sounding. Thedata of Guangdong GPS meteorological monitoring network were processed, analyzed,and validated by radiosonde balloon data.6) Preliminary analyzes the relationship between water vapor content and rainfalland the trendsof water vapor movement.Through researchto above content, the conclusion which obtains is: TheSaastamoinen troposphere model is the best model fit the Guangdong area application; The VMF1mapping functionis the best mapping function fit the Guangdong areaapplication; The Guangdong area’s weighted mean temperature localization model isTm=97.473+0.6386Ts, the model correlation coefficient is:0.9053.The results of this study hasbeen applied to the processing of GPS meteorologicalmonitoring network data in Guangdong Province.