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文中讨论了利用全球定位系统探测水汽的原理。为了反演出大气垂直积分水汽或可降水，需要计算加权“平均温度”Ｔｍ。Ｔｍ与对流层温度廓线和水汽垂直分布有关，但从北京气象台１９９２年探空资料分析表明，它与表面温度存在着很好的线性关系。文中应用中尺度气象模式，给出了适合于中国东部地区和不同季节的关于Ｔｍ和表面温度Ｔｓ的线性回归方程
The article discusses the use of global positioning system to detect water vapor principle. In order to reverse the vertical integral water vapor or precipitation, we need to calculate the weighted “average temperature” Tm. Tm is related to the tropospheric temperature profile and the vertical distribution of water vapor. However, the sounding data of Beijing Meteorological Station in 1992 show that there is a good linear relationship between the Tm and the surface temperature. In this paper, we use the mesoscale meteorological model to give a linear regression equation for Tm and surface temperature Ts suitable for eastern China and different seasons