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随着地磁场模型和地磁导航等研究的深入,需要合适的地磁场模型精度评价方法。利用世界地磁场模型(world magnetic model,WMM)和国际地磁台网(INTERMAGNET)观测数据,研究了最新的WMM2010模型在全球范围内的精度,并分析了WMM在欧洲、北美洲、中国及邻近地区等不同局部区域的精度。根据地磁场模型球谐系数截断阶数与空间最小分辨率波长关系,提出用格网化方法来评价地磁场模型的精度,并给出了WMM在全球和局部地区的精度。
With the in-depth study of geomagnetic field model and geomagnetic navigation, the accuracy evaluation method of geomagnetic field model is needed. Using the world magnetic model (WMM) and the international observatory data (INTERMAGNET), the global accuracy of the latest WMM2010 model has been studied and the results of WMM in Europe, North America, China and its neighboring regions Such as the accuracy of different local areas. According to the relationship between the cutoff order of the spherical harmonic coefficients and the wavelength of the minimum spatial resolution, a gridding method is proposed to evaluate the accuracy of the geomagnetic field model. The accuracy of WMM in global and local regions is also given.