Research on Gridding Precision Evaluation Method of Geomagnetic Field Model

摘要

With the in-depth research on geomagnetic field model and geomagnetic navigation, the appropriate method of precision evaluation of the geomagnetic field model is required. WMM model and INTERMAGNET observations data are used to research the precision of the latest WMM2015 model in the world, and analyze the accuracy of different local areas, such as Europe, North America, and China. According to the relationship between truncation order of spherical harmonic coefficients of geomagnetic field model and wavelength of spatial resolution, gridding method is proposed to evaluate the geomagnetic field model. The precision analysis of WMM2015 model in the global and local area is provided for the reference of obtaining the more-refined geomagnetic map in geomagnetic navigation matching.