FY-3E掩星反演电离层foF2、hmF2和TEC参数精度评估

Accuracy Evaluation of Ionospheric foF2,hmF2 and TEC Derived from FY-3E

在分析FY-3E提供的每日掩星数据数量及其全球分布特征基础上,利用电离层垂测仪数据获取的F2层临界频率值(foF2)和F2层峰值高度(hmF2)、高精度全球电离层格网(GIM)及国际参考电离层模型(IRI2016)提供的总电子含量(TEC)对FY-3E掩星反演的foF2、hmF2和TEC精度进行评估。结果表明,电离层垂测仪和FY-3E反演的foF2和hmF2数据的相关系数分别为0.86和0.75,RMSE分别为0.99 MHz和19.26 km。以GIM数据获取的TEC为参考,FY-3E GPS和北斗(BDS)数据反演的TEC精度大致相当。FY-3E TEC精度与太阳活动呈负相关;FY-3E TEC与GIM TEC的相关系数为0.90,RMSE为5.23 TECu。FY-3E TEC与同高度范围的IRI2016 TEC的相关系数为0.88,RMSE为3.70 TECu。

Based on the analysis of the daily occultation data provided by FY-3E and its global distribution characteristics,we evaluate the accuracy of foF2,hmF2,and TEC derived from FY-3E using the critical frequency(foF2) and peak height(hmF2) obtained by the ionosonde and the total electron content(TEC) provided by the global ionospheric map(GIM) and the international reference ionosphere model(IRI2016).The results show that the correlation coefficients of foF2 and hmF2 between ionosonde and FY-3E are 0.86 and 0.75,and the root mean square errors are 0.99 MHz and 19.26 km,respectively.Taking the GIM TEC data as a reference,the accuracy of TEC retrieved from FY-3E GPS and BDS data is approximately equivalent.Moreover,the accuracy of FY-3E TEC is negatively correlated with solar activity.The correlation coefficient between FY-3E TEC and GIM TEC is 0.90,and the root mean square error is 5.23 TECu.The correlation coefficient between FY-3E TEC and IRI2016 TEC in the same height range is 0.88 and the root mean square error is 3.70 TECu.