本文简单介绍了地磁场的特点，地磁要素和地磁图以及地磁埸成因的几种假说。
In this Paper, the speciality of geomagnetic field, geomagnetic factors, geomagnetic map and hypothesis of formation cause of geomagnetic field have been simply introduced.
详细论述了磁偏角自动计算的原理，并提出了一种利用地磁图自动计算图幅磁偏角的新方法。
This paper describes the principle of computing map magnetic declinations, a new method of computing MMD is presented.
地磁图匹配算法作为地磁辅助惯性导航系统的重要组成部分，是影响系统定位精度的一个重要因素。
As one of the important components of the GAN, the geomagnetic map matching method (GMMM) is an important factor to effect the precision of the system positioning.
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