Research On Region Precipitable Water Vapor Retrieval Using CORS Data

Water vapor in Earth’s atmosphere not only is a greenhouse gas but also is a major factorin the formation of precipitation. Water vapor in the atmosphere has been studied byclimatology, atmospheric environmental science, hydrology, space geodesy and many otherfields of research directions. The atmospheric water vapor has the uneven distribution inspace, time-changing fast and other characteristics and is affected more by objective factors.Given the current limitations of detection technology, the determination of atmospheric watervapor is still a difficult problem that restricts the research in many disciplines in this area.With the GPS (Global Positioning System) technologies emerge, GPS theory and methods todetect water vapor has become not only one of the hot in the GPS application but also a newmeans to detect water vapor. It effectively supplements the conventional detection methods ofatmospheric water vapor and has a great significance in the analysis of water vapor,precipitation and meteorological research.This article focuses on the research of retrieving atmospheric water vapor with thetheories of Ground-based GPS.Harbin January9-10,2007CORS (Continuous OperationalReference System) data and neighboring IGS (International GPS Service) data were combinedto calculate the Precipitable Water Vapor of zenith direction by using GAMIT (GPS Analysisat MIT) software and compared with the actual weather conditions, which demonstrated thefeasibility of using CORS data to retrieve the regional atmospheric precipitation. Primarycontent is as follows:1, Introduce the principle of GPS positioning, CORS, VRS (Virtual Reference Station).2, Describe the current methods of detecting atmospheric water vapor content.3, Detail the principles of ground-based GPS meteorology, analyse the troposphericzenith all delay and the zenith hydrostatic delay model, summarize relationships betweenZenith wet delay and precipitable water.4, Briefly introduce the use and installation of software GAMIT, detail the GAMIThigh-precision GPS data processing procedures.5, According to data in Harbin CORS station, selecte around four IGS stations and selecte month9-10,2007as a study period. Collate data, calculate one of the solutions of thePWV CORS6, The use of surface meteorological data and sounding data to calculate the PWVmethod were studied.7, Compare GPS PWV measures and PWV results calculated though groundmeteorological data, meteorological data.