The application of geomagnetic spatial frequency spectrum in geomagnetic localization

Abstract

In order to reduce the bad impact of the geomagnetic signal's error on geomagnetic localization, this paper pay much attention on studying the character of geomagnetic signal and error using method of spatial frequency spectrum analysis. First, Fourier analysis method is used to study frequency feature of geomagnetic signal and error, an important result is get that in Fourier domain the character of geomagnetic signal is almost the same with signal which contains noise. Secondly, based on the above result, Time-Frequency Matching (TFM) method is used to carry out geomagnetic localization. Finally, this paper compares TFM with Contour Constraint Matching method in application of geomagnetic localization, and the results show that when the geomagnetic signal contains white noise, the localization error of TFM is smaller. So the analysis of Geomagnetic Spatial Frequency Spectrum has great importance in geomagnetic localization application. © 2011 Springer-Verlag Berlin Heidelberg.