多数据源电离层层析成像方法  

Ionospheric tomography using diversedata sources

作　　者：赵海生[1,2] 许正文[1] 

机构地区：[1]中国电波传播研究所,电波环境特性及模化技术重点实验室,山东青岛266107 [2]中国科学院空间天气学国家重点实验室,北京100190

出　　处：《电波科学学报》2011年第4期649-653,822,共6页Chinese Journal of Radio Science

基　　金：国家自然科学基金项目(60771050,60871076,40831062);国家重点实验室专项基金资助项目共同资助

摘　　要：卫星信标电离层层析成像(CIT)是一种高度不适定性问题,有限视角、稀疏布站等原因造成电离层CIT数据采集严重不完整,CIT结果精度不高,尤其是垂直误差可达50km以上。为了解决CIT结果精度不高的问题,提出一种融合地面垂测、斜测数据、顶部探测仪数据和三频卫星信标数据的多数据源电离层联合CIT方法。该方法采用建立在实测数据基础上的迭代初值,与实际偏离较小,能够提高CIT反演结果的精度;同时地基设备和顶部探测设备有较高的垂直分辨率,与卫星信标结合能够有效解决有限视角问题,提高CIT结果的垂直分辨率。The computerized ionospheric tomography （CIT） is a serious under-determined ill-posed inverse problem. The limited-angle geometry and sparse receivers lead incomplete information in measurements, which affect the precision of the CIT imaging, especially in the vertical dimension, the error could reach more than 50kin. In order to resolve the problem, this paper puts forward a new method by combining vertical, oblique sounding data and top sounding data with the total electron content （TEC） from an assumed tri-band beacon. This method has two mer- its, firstly, the initial profile for the iteration is specified by actual vertical, which deviates from the actual electron density distribution and is smaller than those calculated only from models. Secondly, the ground base equipments have high vertical resolution, which make up the disadvantage of the tri-band beacon and improve the precision of the CIT imaging.

关 键 词：CIT成像 多数据源融合 三频信标 TEC 

分 类 号：P352[天文地球—空间物理学]