利用GPS观测反演三峡地区对流层湿延迟的分布及变化

Inversion of the Distribution and Variation of ZWD over the Three Gorge Area with GPS Observation

利用三峡地区 8个监测点连续三天的监测数据 ,联合 3个IGS站在此期间的观测 ,反演了各监测点对流层上空的天顶总延迟ZTD ,利用外推的地表气压资料由模型分离出其中的静力学延迟ZHD ,得到天顶湿延迟ZWD含量 ,并对湿延迟变化趋势线进行了分析。通过对该区域短时间内每间隔两小时湿延迟分布图的分析 。

With the continuous GPS monitoring data of the eight points of the Three Gorge area, the Zenith Total Delay over each points are extracted out. When processing the GPS data, we make use of the observation data of three IGS stations to minimize the correlation between ZTDs. After separating the zenith hydrostatic delay with the extrapolated surface pressure and Saastanmonien model, we get the zenith wet delay (ZWD). The ZWD sequential lines of all points are consistent. After analyzing the ZWD distribution figures of 8 hours in this area, some information of variation of the water vapor can be obtained. The feasibility of monitoring water vapor distribution and variation with ground-based GPS meteorology is discussed. Some conclusions and suggestions are obtained.