基于测高仪的TEC与GNSS-TEC的比较研究  

Comparative study of ionosonde TEC and GNSS-TEC

作　　者：赵聪 姜春华[1] 刘静[2] 魏乐惠 杨国斌[1] 赵正予[1] ZHAO Cong;JIANG ChunHua;LIU Jing;WEI LeHui;YANG GuoBin;ZHAO ZhengYu(Electronic Information School,Wuhan University,Wuhan 430072,China;Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China)

机构地区：[1]武汉大学电子信息学院,武汉430072 [2]中国地震局地震预测研究所,北京100036

出　　处：《地球物理学进展》2022年第4期1528-1534,共7页Progress in Geophysics

基　　金：国家自然科学基金资助项目(42074184)资助。

摘　　要：本文利用武汉站(30.54°N,114.37°E)2021年2月20日到3月20日的测高仪TEC(Total Electron Content)数据和基于GNSS(Global Navigation Satellite System)的TEC数据进行比较研究,以期得到更为准确的顶部电离层模型来计算测高仪的TEC参数.首先利用频高图度量的电离层参数通过两种不同的方法(一种是构建电离层电子密度剖面;另一种是利用foF2与VTEC的经验关系)计算TEC值,然后以GNSS-TEC为标准进行了对比分析,选取出了一种相对较合适的方法以通过测高仪来计算TEC参数.结果表明利用foF2与VTEC(Vertical Total Electron Content)的经验关系直接计算TEC参数的误差较大,而通过构造顶部电离层模型的方式,在选取较为合适的模型时,利用测高仪计算的TEC和GNSS-TEC是具有可比性的.本文研究发现,当顶部电离层模型采用系数为0.65的Chapman模型时,它相对于GNSS-TEC的误差值最小,当结合使用Epstein模型时,其偏差和波动将会有更好的表现.本文利用基于电离层顶部不同模型计算的TEC和GNSS的TEC观测数据进行比较研究,为电离层顶部模型的构建和如何提高测高仪计算TEC的精度提供了新的思路.Compared with the structure of the bottom of the ionosphere,there are fewer studies on the characteristics of the structure of the top of the ionosphere due to the lack of observational data.This study used the TEC(Total Electron Content)calculated by the ionosonde and the GNSS(Global Navigation Satellite System)to conduct a comparative study,which provides a new idea for the study of the top structure of the ionosphere.In this study,we compared the ionosonde TEC data and GNSS-TEC data at Wuhan Station(30.54°N,114.37°E)during February 20 to March 20,2021,expectantly,to get a more accurate top ionospheric model to calculate the TEC parameters of the ionosonde.In this study,TEC were calculated through two different methods(one is to construct the ionospheric electron density profile;the other is to use the empirical relationship between foF2 and vertical TEC).Then,using GNSS-TEC as the standard to compare and analyze to select a relatively suitable method to calculate the TEC parameters through the ionosonde.The results show that the method associated with the empirical relationship between foF2 and VTEC has a large error.By constructing the top ionospheric model,when selecting a more appropriate model,the TEC calculated by the ionosonde and the GNSS-TEC are comparable.This study found that when the top ionosphere model adopts the Chapman model with a coefficient of 0.65,its error value relative to GNSS-TEC is the smallest.Combined with the Epstein model,its deviation and fluctuation will have a better performance.This study could provide some new ideas to reconstruct the topside ionosphere and improve the accuracy of VTEC from ionosondes.

关 键 词：TEC 频高图 GNSS 测高仪 ionoScaler 

分 类 号：P352[天文地球—空间物理学]