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Ou Jikun(Institute of Geodesy and Geophysics (IGC), Chinese Academy of Sciences, Wuhan, 430077)  
As we know that the refraction of the neutral atmosphere on radio signals is one of the important error sources in GPS surveying. The accuracy of the vertical component in positioning is restricted strongly by the extent of correction for this kind of delay. In this paper, firstly, the algorithm and the models of the neutral atmospheric delay are summarized and the formulas of estimating accuracy of baseline in GPS surveying which are effected by this delay are introduced. Secondly, the effects of the variations of the different meteorological parameters, such as atmospheric pressure, temperature, the partial pressure of water vapor or relative humidity, etc. on calculating the delay are discussed in detail, and the results of simulated calculation by using several different models are compared with each other, some conclusions are reached. Finally, some remarks on using the Saastamoinen's model and the Hopfield's model are given which should be paid attention to in practice.
【Fund】: 中国科学院测量与地球物理研究所动力大地测量开放研究实验室资助
【CateGory Index】: P228
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