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中文摘要：
轨道误差是GPS水汽监测的重要误差来源，对轨道误差对水汽监测的影响进行分析，并研究Neville算法在预报精密星历轨道插值上的可行性，实现近实时水汽监测的轨道插值处理，为水汽监测奠定基础。
英文摘要：
Orbit error is a very important error source of water vapor sounding used in GPS. In order to deal with the orbit interpolation in real-time water vapor sounding. The orbit errors effect on water vapor sounding is analysed and the feasibility of precisely predicting ephemeris using Neville algorithm is studied. It is shown that the Neville algorithm can meet precisely predicted ephemeris interpolation on near real-time and lay a foundation for water vapor sounding.
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