周康俊^1,2,,
蔡红涛^1,2,,,
宋方雷^1,2,
谷骏^1,2,
潘建宏^1,2
1. 武汉大学电子信息学院, 武汉 430072
2. 武汉大学空间环境与大地测量教育部重点实验室, 武汉 430072

基金项目: 国家重点研发计划（2018YFF013702），国家自然科学基金项目（41374159，41431073，41574148）资助


详细信息

作者简介: 周康俊, 男, 1989年生, 博士研究生, 主要从事极区电离层与此次耦合方面的研究.E-mail:pipita@whu.edu.cn

通讯作者: 蔡红涛, 男, 1976年2月生, 教授, 博士生导师, 主要从事电离层与磁层物理、空间探测与信息处理技术方向的研究.E-mail:htcai@whu.edu.cn

中图分类号: P352

收稿日期:2020-03-16
修回日期:2020-07-16
上线日期:2020-09-05

Computerized ionospheric tomography study of three-dimensional electron density distribution in the top ionosphere based on Swarm satellites GPS/TEC observations

ZHOU KangJun^1,2,,
CAI HongTao^1,2,,,
SONG FangLei^1,2,
GU Jun^1,2,
PAN JianHong^1,2
1. School of Electronic Information, Wuhan University, Wuhan 430072, China
2. Key Laboratory of Geospace Environment and Geodesy, CNEM, Wuhan University, Wuhan 430072, China


More Information

Corresponding author: CAI HongTao,E-mail:htcai@whu.edu.cn

MSC: P352

--> Received Date: 16 March 2020
Revised Date: 16 July 2020
Available Online: 05 September 2020


摘要
摘要:利用两颗伴飞的Swarm A/C卫星搭载的双频GPS接收机获取的TEC数据，在两个卫星轨道平面同时对顶部电离层电子密度进行层析成像，实现对顶部电离层电子密度的三维观测.为了能够重现扰动期间电离层电子密度的空间变化特征，在正则化求解过程中，我们引入了水平矩阵H和垂直矩阵V刻画电子密度的空间变化特征，引入整体约束矩阵C以调节不同空间对电子密度相对变化的权重.数值验证结果表明我们的算法对常见的观测误差具有较强的包容性，反演计算出的电子密度平均偏差优于10%.在不同地磁活动条件下，与第三方观测数据的对比，验证了本文反演算法的可靠性.实测数据反演结果表明我们的算法不仅能够较好地重现顶部电离层子午向百公里级别的不规则结构，还能有效分辨纬向相隔~150 km的两个卫星轨道平面的电子密度差异.
关键词: 电离层层析/
Swarm卫星/
顶部电离层/
电离层电子密度

Abstract:Local measurements of three-dimension electron density in topside ionosphere were achieved by means of computer tomography based on TEC observations from the Swarm A/C satellites. The computerized ionospheric tomography were carried out simultaneously in the two spacecraft orbit panels. Tikhonov regularization was employed in the inversion, during which constraints of spatial density relative variations and their weights were applied with help of empirical model. Numerical validations indicate strong tolerance to usually observation errors of our method, with an average density deviation better than 10%. Comparisons with in-situ observations under various geomagnetic conditions were carried out. It was verified that our method is capable of well reproducing the characteristics of field-aligned irregularities with scale of several hundred kilometers in the top ionosphere, as well as the density discrepancy between the two spacecraft orbit panels.
Key words:Computerized ionospheric tomography/
Swarm satellites/
Topside ionosphere/
Ionospheric electron density



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