GPS-LEO无线电中性大气掩星反演误差分析

Retrieval on GPS-LEO Atmospheric Radio Occultation and Error Sources Analysis

简要介绍GPS-LEO掩星大气反演算法的基本原理,考虑到多种误差源对反演大气参数带来的影响,利用EGOPS仿真模拟软件,采用三维射线追踪法模拟了1d内426个掩星事件,并统计分析多种误差源的影响特性。通过反演温度的统计分析发现,现有的卫星钟稳定性以及卫星定轨精度可以满足反演需求;噪声误差对反演影响较大,需要采取有效措施抑制;多路径效应中,周期误差影响较小,但振幅对反演结果有一定影响,需要有效抑制。

Radio occultation technology is an effective means of neutral atmospheric observation.This paper briefly introduces the basic flow of GPS\|LEO neutral atmospheric radio occultation inversion.Considering the influence of various error sources on the inversion of atmospheric parameters,we use EGOPS simulation software to simulate 426 occultation events a day using 3D ray tracing method,analyzing the influence characteristics of many error sources.The statistical analysis of the inversion temperature shows that the stability of the satellite clock and the accuracy of the satellite orbit determination can meet the occultation inversion demand.The noise error has a great influence on the inversion,and effective measures are needed.For the multipath effect,the influence of the periodic error is small,but the amplitude has some influence on the inversion result,and it needs to be effectively suppressed.