中文摘要：

为了提高局地天顶干延迟（ZHD）的估计精度，本文利用桂林探空站的气象观测资料，通过最小二乘和线性回归的方法得到基于地面气压的局地天顶干延迟（ZHD）线性回归模型，将其ZHD值与3种经验模型的拟合结果进行比较，并用前40天的气象数据回归得到的天顶干延迟模型拟合后20天的ZHD值。结果表明，局地天顶干延迟线性回归模型整体精度高于3种经验模型。且具有较强的外推性。

英文摘要：

In order to improve the estimation precision of zenith hydrostatic delay（ZHD）, this paper built a local correction model of zenith hydrostatic delay based on surface pressure by utilizing the radiosonde data of Guil- in using least square and linear regression methods, compared with three empirical ZHD models and used 40-days- before data to fit 20-days-after ZHD data. The results showed that the local ZHD model of linear regression would be better than the three empirical models on the overall precision with good extrapolation.