地磁图制备方法及其有效性评估

高精度地磁图制备是地磁匹配导航关键技术之一.在简单介绍4种网格插值方法原理的基础上(反距离加权插值法、克里金插值法、改进的谢别德插值法以及径向基函数法),应用实测地磁数据,选取测点分布较均匀区域,根据上述插值方法分别制备地磁图,并通过交叉验证统计准则对地磁图制备方法的有效性进行评估.结果表明,径向基函数插值法制备的地磁图"鸭蛋"形分布较少,地磁图等值线较圆滑,其标准偏差远小于其它方法的标准偏差,且其标准误差以及平均偏差也最小,具有较高的插值精度,能更好地反映该区域地磁场分布情况.

Geomagnetic mapping and validity estimation

One of the key technologies of geomagnetic matching navigation is looking for high accuracy geomagnetic map.Based on introducing the principles of four kinds of interpolation methods(inverse distance to a power method,Kriging method,modified Shepard's method and radial basis function method),the data of geomagnetic survey was used,and a region where the survey points were uniform was selected.Geomagnetic maps were created by all the interpolation methods,and cross-validation was used to estimate the methods...