适于地磁导航的高精度区域地磁场建模研究

从地磁匹配导航的原理出发，分析并提出了开发地磁匹配导航需要解决的关键技术问题。针对现有地磁场模型精度偏低、模型边界效应等问题，深入分析了传统补充国际地磁参考场值的缺陷。提出了采用边界插值约束的Taylor多项式拟合法，建立适合地磁匹配导航的高精度地磁场模型，为匹配算法提供可靠的参考依据；并提出了多项式最佳插值截断阶数的算法；最后，进行了仿真试验。试验证明：该技术具有优于补充国际地磁参考场值建立高分辨率模型的方法，可以提高模型的分辨率，改善建模过程中存在的边界效应问题。

Study on Modeling of High Accuracy Regional Geomagnetic Field Used for the Geomagnetic Navigation

From principle of the geomagnetic matching navigation, the key technical problems, which need to be solved in developing the navigation, were analyzed and proposed. Taking aim at lower pre?cision and boundary effect of the current region geomagnetic field model, the shortage of appending the IGRF data to the regional boundary was analyzed deeply. A higher precision regional geomagnetic field model suitable for geomagnetic matching navigation was established by the Taylor polynomial fitting method with boundary interpolation constraint to provide reliable reference basis for the matching algo-rithm ;the algorithm of the optima polynomial interpolation truncation order was put forward; the simulation was conducted by the model and the algorithm. The simulated results show that the tech?nology which is better than the method of appending the IGRF data obviously can improve the resolu?tion of regional geomagnetic field model and resolve the boundary effect.