地磁辅助导航是一种重要的定位方法,其关键技术之一就是建立满足地磁导航所需要的地磁图。针对船测地磁数据覆盖面不足,且航测地磁数据延拓精度不高的问题,该文提出了一种以多面函数为基准对地磁测量系统误差进行建模的方法,以完成多源地磁数据的融合,并且通过仿真实验对算法进行了评价,验证了算法的有效性。 Geomagnetic navigation aided navigation is an important method of positioning, one of the key technologies is to create geomagnetic maps to meet the needs of geomagnetic navigation. Aiming at the problem that the coverage of shipborne geomagnetic data is not enough and the accuracy of aerial survey geomagnetic data extension is not high, this paper presents a method to model the error of geomagnetic survey system based on multi-faceted function to complete the fusion of multi-source geomagnetic data , And the algorithm is evaluated through simulation experiments to verify the effectiveness of the algorithm.