Software Development on the Establishment of Local Marine Geomagnetic Filed Model

Geomagnetic field is the one of the inherent physical characteristics of the earth. For earthquake prediction to independent navigation or to other applications, local geomagnetic model plays a very important role. In order to control the performance of the local geomagnetic field model, the methods like polynomial, polyhedral function, spline function, rectangular harmonic analysis and spherical cap harmonic are discussed in detail in this paper. Integrated these methods, a software on the establishment of local geomagnetic field model is developed. The software is tested in a local area. The experiment shows that the software design is reasonable, the methods used in the software are right, and the accuracy of establishing local geomagnetic field model is higher and can meet 5 nT high-precise requirements.