中文摘要：

在详细分析高差以及对流层延迟水平变化对GPS测量精度影响的基础上,通过Bernese软件估算香港连续参考站网基站数年的天顶对流层延迟,建立了符合香港地区的只需时间与位置输入参数的精密对流层延迟改正模型。经检验,新模型的对流层改正精度与输入标准气象的Saastamoinen模型相比提高了约2～3倍,对高差较大的对流层延迟改正效果更加显著。

英文摘要：

In this paper,the effects of height difference and the horizontal change of troposphere on the accuracy of GPS surveying is discussed at first.And then GPS observation data collected in several years from Hong Kong Continuously Reference Station Network is used to model the precise tropospheric delay.This model is based on estimated zenith tropospheric delay of all the stations using the Bernese GPS software.The input parameters of the model are day of year and location of the station.The testing results show that the tropspheric delay error can be reduce about 2 to 3 times compared to Saastamoinen model with standard meteorological parameters,and the effect is more remarkable when the height difference of two stations is large.