Integration method for estimating zenith troposphere delay

The invention provides an integration method for estimating zenith troposphere delay, during calculation of a zenith troposphere still water delay and a zenith troposphere humidity delay, considers variation of a still water refractive index and atmospheric pressure and variation of a humidity refractive index and atmospheric pressure on two adjacent height layer, converts the still water refractive index and the humidity refractive index into a function where atmospheric pressure changes with height, and then estimates the zenith troposphere still water delay and the zenith troposphere humidity delay after integration is carried out. In spatial distribution, under the condition that vapor pressure ''inversion layer'' and atmospheric temperature ''temperature inversion'' exist, a new integral model can estimate the ZTD more accurately. 本发明提出种估算对流层天顶延迟的积分方法，在计算天顶对流层静水延迟和天顶对流层湿度延迟时分别考虑了相邻两高度层上静水折射指数和大气压强的改变量以及湿度折射指数与大气压强的改变量，并分别将静水折射指数和湿度折射指数转为大气压强随高度变换的函数，然后对其进行积分后分别估算出天顶对流层静水延迟和天顶对流层湿度延迟。在空间分布上，当存在水汽压"逆增层"和大气