Matching Suitability of Geomagnetic Aided Navigation Based on Spectral Moment Characteristics

A novel matching-area suitability assessment method for geomagnetic matching aided navigation is proposed, which is based on spectral moment characteristics. With the analysis of profile spectral moment and the surface spectral moment, parameters of both homogeneity and isotropy are employed to analyze the effect of direction on geomagnetic three-dimension surface topography. Finally, simulations are made with the computing result of spectral moment parameters. Compared the matching effect of the Inertial Navigation System (INS) indicated path and the real path in the geomagnetic field contour map in different directions, a conclusion is reached that there is a good agreement between flight path and directions. Simulation results prove the proposed assessment method is effective.