中文摘要：

实验发现,当接收机发生钟跳时,对流层参数解算精度会受到严重影响。在对流层参数估计时,若固定测站坐标,则接收机钟差和对流层延迟参数相关性大大增强,对流层延迟的估计精度会随着接收机钟差精度的降低而降低,反之亦然。采用2012-07-21北京市区和房山区两个台站的数据分析表明,利用精密单点定位技术和IGS预报产品实时反演的水汽精度为2-3 mm。

英文摘要：

The features of receiver clock and satellite clock are the key factors to affect the precision of zenith total zenith delay when ZTD is computed by zero-difference precise point positioning. Experiments show that solution precision of troposphere parameter is largely affected by the clock jump. A reasonable strategy for this is given. Under the circumstance of site＇ s coordinates being fixed,the relation between receiver clock and ZTD parameters are enhanced, and ZTD＇ s precision will reduce with reduction of receiver clock precision, vise versa. The result analyzed 7.21data from Bejing and Fangshan stations indicates that real time PWV can be derived by IGS predicted product and PPP skill, and corresponding precision reaches 2 -3 turn, which can satisfy the need of weather forecast.