中文摘要：

GPS掩星探测技术可以探测中性大气获得全球大气折射率、气压、密度、温度和湿度等气象参数，该技术基本原理是基于信号多普勒观测和球对称大气的几何光学近似下Abel积分反演，获得大气廓线。在归算过程中，需要考虑地球曲率、电离层传播时间延迟、大气大尺度水平梯度、多路径传播现象等物理因素对大气反演廓线的精度影响。研究了在标准大气模式下地球局部曲率中心相对于地球中心位置变化并拟合其最佳逼近函数，研究成果可以为相关领域的研究提供参考。

英文摘要：

GPS radio occultation technique can measure the profiles of the global meteorological fields of the neutral atmosphere, from which can be obtained the atmosphere refractivity, pressure, density, temperature, humidity and other meteorological parameters. The basic theory of the technique is based on the signal Doppler observation and the inversion method of Abel integration, which can be gained atmospheric profiles. In this progress, some factors such as the earth＇s curvature, the ionospheric propagation time delay, the large-scale horizontal refractive index gradients in the atmosphere and atmospheric multi-path can influence the precision of retrieval. The earth＇s local curvature center is relative to earth＇s center under the standard atmospheric models and research their optimal approximation functions, the research result can provide reference to relevant fileds.