摘要
This study utilizes the 62208000 Swarm satellite data to establish a high-precision main magnetic field at the height of the satellites in China and its adjacent regions.The CHAOS-6 model is used to remove the crustal and external fields and obtain 2788 main field grid data.We use the main field grid data to build a three-dimensional(3D)surface spline(3DSS)model of the satellite altitude in China.Other regional models(namely the 3D,two-dimensional(2D)Taylor,and 2D surface spline models)and the CHAOS-6 model are employed to model and analyze the same region.The results show that the 3DSS model can represent a good fi tting for the northward(X)and eastward(Y)components and the total intensity(F).This model demonstrates the most stable results for the 20 points that did not take part in the modeling.Compared with the other three regional models,the root–mean–square error values and the average residuals of the new model are approximately 65%and 69%lower for each component,respectively.This study does not rely on ground station data to derive a more accurate regional main fi eld model.The results further show that less data height difference and high-density data distributions greatly improve the regional model accuracy.The new model has a certain application value to related space geophysics,such as in spatial positioning and navigation,and to the study of regional magnetic anomalies.
为了建立中国及邻近区域卫星高度处高精度的主磁场,本文利用62208000个Swarm卫星数据进行筛选、归算,使用CHAOS-6模型移除岩石圈磁场和外源场后得到2788个主磁场网格数据,建立了卫星高度的3D Surface Spline(3DSS)模型。与其他区域模型(3D、2D Taylor多项式模型和2D Surface Spline模型)以及CHAOS-6模型进行相同区域的建模分析。结果显示3DSS模型对地磁北向分量X、东向分量Y以及总强度F都有较好的模拟。对于20个缺测点而言,3DSS模型最稳定。和其他三个区域模型相比,新建模型各分量的RMSE值及平均残差分别小65%及69%以上。本次研究不依赖于地面台站数据建立了更高精度的区域主磁场模型,说明更少的数据高度差异和高密度的数据点分布可以大幅提高区域模型的精度。本模型对相关的空间地球物理,如空间定位导航、研究区域磁异常等具有一定应用价值。
基金
supported by the National Natural Science Foundation of China (Nos. 42030203, 41974073, and 41404053)
