| With the development of the Global Navigation Satellite System, especially the American's Global Positioning System is involved. Now the GPS continuous tracing sites cover every corner of the world. This promotes largely other subjects' advancement, such as geodesy, astronomy, meteorology and so on. The technology of remote sensing water vapor is one aspect of the GPS application and the ground-based GPS Meteorology is developed. The GPS remote sensing water vapor has its advantages. However, there are some disadvantages in it. Therefore, there are still many problems to be solved.The article makes the basic principle and research methods of GPS Meteorology as the main study object. The paper chooses 8 GPS sites in Northern America to constitude the GPS observation net and get the zenith precipitable water vapor. Briefly, it includes mainly the following parts:Firstly, the paper introduces briefly the development process of the GPS meteorology. Meanwhile, it discusses the situation of GPS/MET research in home and abroad.Secondly, the principle of GPS/MET, the model of the zenith total delay and the model of the zenith hydrostatic delay are discussed in detail. The main errors of GPS remote sensing water vapor technology are also discussed here.Thirdly, the software of GAMIT is introduced in this chapter in details, including the use and installation of the software and the processing of GPS data.Fourthly, a concrete example is analyzed. With the former 8 GPS sites' observation data, the precipitable water vapor is obtained using the GAMIT. And the comparison with the practical precipitation process from the local weather stations is made in this chapter.Finally, the calculation accuracy of the GPS precipitable water vapor was verified in the examples as KUNM and LHAZ stations. Comparing with the radiosond data, their relative coefficients are both better than 0.92, and then the result is trustworthy. At last, the application in the weather prediction is also analyzed.
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