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中文摘要：
系统地推导了基于局域参考站网络伪距观测进行实时钟差的运算公式,并讨论了以估计得到的钟差进行实时单站定位的数学模型.采用所推导的公式及数学模型,以上海参考站网络和同济大学GPS基准站的伪距观测数据,进行了GPS卫星钟差的实时估计和实时动态单点定位解算.结果表明,单历元伪距观测动态定位结果在北、东、上三个方向的均方根（RMS）值可达到0.444 2,0.522 7,1.110 9m.
英文摘要：
The formula by which the real-time clocks are estimated is deduced,and the model of precise point positioning is discussed based on the pseudorange observation of regional reference network.The pseudorange observation from Shanghai reference network is used to estimate clocks using the presented method.Using the estimated clocks,the data from Tongji University Station is processed in real-time point positioning mode.The real-time kinematic results indicate that the root mean square（RMS） of three directions such as the North,the East and the Up are 0.444 2,0.522 7,1.110 9 m,respectively.
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