The Study On Remote Sensing Of Atmospheric Water Vapor Based On Ground GPS

With the development of GPS navigation techniques, especially theestablishment of continuous GPS stations, the study on GPS Meteorology hasbeen promoted. The estimation of water vapor content in the atmosphere is themost active research topic today. Compare with traditional way, the new onehas lot of advantage. But it has not been reach the step of normal application.Some technique problem concerned about it needs to be solved in the nearfuture.The focus on principle of water vapor content estimation based onground GPS/MET is discussed in this thesis. Water vapor content wasprocessed using Beijing GPS station data. The main research topics are:1,The development and current status of GPS/MET are discussed, andalso the study on GPS/MET in America Germany Japan and China areintroduced .2, The characteristic of water vapor and the action of water vapor forclimate are talked. The importance of remote sensing water vapor is given indetail.3,The principle of remote sensing water vapor content based on groundGPS is elaborated ,including the calculation of total tropospheric zenith delayfrom GPS data, the dry tropospheric delay using deterministic model and theconvert formulation from the wet zenith delay in GPS signal to water vaporcontent.4,Analyses the error included in the procession of water vapor contentbased on GPS data and the method of error elimination is proposed.5,Beijing continuous reference GPS data has been used to process watervapor content in three ways.6,The information about ionospheric delay and the ionospheric modelbased on GPS data are talked in detail. Two kind of ionospheric mode areapplied in water vapor content process using L1 GPS data.