iGMAS全球电离层TEC格网产品精度分析

Accuracy analysis of iGMAS global ionospheric TEC grid products

为了分析与评估国际GNSS监测评估系统(iGMAS)全球电离层TEC格网产品精度,该文基于iGMAS及IGS各电离层分析中心发布的全球电离层TEC格网产品,进行了精度比较分析,结果表明:iGMAS与IGS、CODE、JPL、ESOC、UPC等IGS电离层工作组发布的全球电离层TEC格网产品,在全球、不同纬度带和欧洲等不同区域均表现出较高的一致性和强相关性,互差为0~2.0 TECU;JPL分析中心GIM的内符合精度约为2.5 TECU,iGMAS、IGS、CODE、ESOC和UPC等分析中心GIM的内符合精度均小于1.5 TECU;在2~8 TECU的精度范围内,iGMAS全球电离层TEC格网产品的精度总体与IGS、CODE、JPL、ESOC、UPC等IGS电离层工作组的精度相当。

In order to analyze and evaluate the accuracy of the global ionospheric total electron content(TEC)grid products of the international GNSS monitoring and assessment system(iGMAS),based on the global ionospheric TEC grid products released by iGMAS and IGS ionospheric analysis centers,this paper made a comparative analysis of the accuracy.The results showed that the global ionospheric TEC grid products released by iGMAS and IGS,CODE,JPL,ESOC,UPC and other IGS ionospheric working groups showed high consistency in different regions of the world,and the difference was 0~2.0 TECU.The internal coincidence accuracy of GIM of JPL analysis center was about 2.5 TECU,and that of iGMAS,IGS,CODE,ESOC and UPC analysis center was less than 1.5 TECU.Within the accuracy range of 2~8 TECU,the precision of iGMAS global ionospheric TEC grid products was generally equivalent to that of IGS,CODE,JPL,ESOC,UPC.