全球综合地磁场模型精度评估及统计特征分析  

Accuracy Assessment and Statistical Characteristics Analysis of Global Synthetic Geomagnetic Field Model

作　　者：赵俊 田源 张亚军 ZHAO Jun;TIAN Yuan;ZHANG Yajun(Xi′an Technical Division of Surveying and Mapping,Xi′an 710054,China;State Key Laboratory of Geodesy and Geodynamics,Wuhan 430077,China)

机构地区：[1]西安测绘总站,陕西西安710054 [2]大地测量与地球动力学国家重点实验室,湖北武汉430077

出　　处：《测绘与空间地理信息》2024年第1期20-23,28,共5页Geomatics & Spatial Information Technology

基　　金：大地测量与地球动力学国家重点实验室开放基金(SKLGED2022-1-2)资助。

摘　　要：随着全球地磁场模型的不断更新,利用相关数据开展精度评估及统计特征分析,对于精准评价地磁场模型的可靠性,具有十分重要的意义。结合国际地磁台网(Intermagnet)150个台站,分析了3个(POMME-11,CHAOS-7,EMM2017)全球综合地磁场模型在全球范围内的平均精度,得到了7个地磁分量的相关精度指标,从地磁台站数据比较的数值结果来看,EMM2017整体三精度相对较优,CHAOS-7次之,POMM11最差。其中EMM2017三分量(X,Y,Z)及总强度的精度分别为75.98 nT,104.38 nT,113.07 nT,101.71 nT,相对精度比CHAOS-7提升21.69%,5.45%,21.25%,24.94%,因此,在地学研究及地磁场应用方面,应优先采用EMM2017模型。同时基于功率普、系数相关性、敏感性矩阵3个方面对模型系数进行了统计特征分析,在功率普方面EMM2017均优于其他两个模型,而在系数相关性、敏感性矩阵方面CHAOS-7与CM6相似。With the continuous updating of global geomagnetic field model,it is of great significance to accurately evaluate the reliability of geomagnetic field model by using relevant data to carry out accuracy assessment and statistical characteristic analysis.In combination with 150 stations of Intermagnet,the global average accuracy of 3 global comprehensive geomagnetic field models(POMME-11,CHAOS-7 and EMM2017)is given,and the relevant accuracy indicators of 7 geomagnetic components are obtained.According to the numerical results of comparing with geomagnetic station data,the overall accuracy of EMM2017 is relatively excellent,CHAOS-7 is second,and POMM11 is the worst.The accuracy of EMM2017 three-component(X,Y,Z)and total intensity is 75.98 nT,104.38 nT,113.07 nT and 101.71 nT respectively,which is 21.69%,5.45%,21.25%and 24.94%higher than CHAOS-7.Therefore,EMM2017 model should be preferred in geoscience research and geomagnetic field application.At the same time,the statistical characteristics of model coefficients are analyzed based on power spectrum,coefficient correlation and sensitivity matrix.The EMM2017 is superior to the other two models in terms of power spectrum,while CHAOS-7 is similar to CM6 in terms of coefficient correlation and sensitivity matrix.

关 键 词：地磁场模型 Intermagnet 精度评估 统计特征分析 

分 类 号：P208[天文地球—地图制图学与地理信息工程]