GPS-LEO掩星探测地球大气的方法  

Method of GPS-LEO Occultation Measurements of the Atmosphere

作　　者：王鑫[1] 薛震刚 杜晓勇 严卫[1] 

机构地区：[1]解放军理工大学气象学院,江苏南京211101 [2]北京应用气象研究所北京,100029

出　　处：《全球定位系统》2002年第5期14-20,共7页Gnss World of China

摘　　要：近年来伴随导航定位技术与无线电掩星技术的结合,一种崭新的遥感地球大气的方法一Global Positioning System/Meteorology(GPS/MET)应运而生,该方法可以有效地探测大气温、压、湿等气象参数。本文在介绍利用GPS-LEO掩星技术探测地球大气的原理,以及反演大气参数的方法、步骤的基础上,给出了模拟掩星数据反演出的温度廓线、密度廓线及部分GPS/MET实验数据的初步反演结果。通过分析可以看出,利用掩星技术反演出的温度廓线与大气实际情况相符,并且与ECMWF、NCEP的结果吻合较好。在干空气假设条件下,近地面大气的反演结果与实际情况还存在一定误差,有待深入研究解决。Recently with the combination of navigation, orientation and radio occultation techniques, a new method for sounding the atmosphere named Global Positioning System/Meteorology (GPS/MET)has come forth. This method can effectively sound atmospheric parameters like temperature, pressure, moisture etc. Introducing the theory of radio occultation and methods of inversion of GPS meteorology data, thd temperature and density profiles from the inversion of simulated data and some initial results with GPS-MET experiment are presented. Through the analysis of these profiles, we can conclude that the characteristics of the temperature profiles are not only consistent with atmospheric reality, but also coinciding with the analyses from ECMWF and NCEP. Under the assumption of zero water vapor pressure, the results close to Earth's surface are different with the reality. This problem needs to be resolved by further investigation in this field.

关 键 词：掩星技术 温度廓线 反演 地球大气 全球定位系统 低轨卫星 LEO GPS 

分 类 号：TH765.8[机械工程—仪器科学与技术] P228.4[机械工程—精密仪器及机械]