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.
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。
In this Paper, the speciality of geomagnetic field, geomagnetic factors, geomagnetic map and hypothesis of formation cause of geomagnetic field have been simply introduced.
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。
The abnormal or flat areas can be found from the magnetic map. The geomagnetic space measurement is conducted in the flat areas when with and without underwater vehicle respectively.
从地磁图上可以找到磁异常区域和地磁平缓区域，并在地磁平缓区域进行有无水下载体的地磁空间测量。
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