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中文摘要：
本文提出一种近实时获取高精度对流层延迟（zenith Tropospheric Delay，ZTD）的方法。该方法基于全球GPS参考站网络的非差观测值数据和IGU预报产品（卫星轨道和ERP），使用GPS非差技术和卡尔曼滤波近实时估计各参考站的高精度ZTD。将该方法应用于香港GPS参考站网得到的ZTD与基于事后技术计算的ZTD进行比较后发现，两者的平均偏差均优于5mm，RMS均优于6mm。
英文摘要：
This paper presented a method for near real time obtaining the accurate Zenith Tropospheric Delay （LTD） . l he meth- od, which was based on the un-differenced observation data of global GPS reference station network and the IGU predicted products （ satellite orbit and ERP）, used un-differenced GPS technology and Kalman filter to estimate the near real time accurate ZTD of reference stations. The method was applied to the Hong Kong GPS Reference Station Network, the obtained ZTD was compared with the ZTD calculated by the technique, and it was found that the average deviations were both better than 5mm, RMS were both better than 6mm.
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