摘要

The methods of weak signal detection are analyzed by this paper. In detection of the instantaneous weak magnetic induction signal, excitation signal has a bad affect on the induction signal of underground object. According to practical technology of exploration, work condition and request of the signal processing, blind source separation based on generalized eigenvalue decomposition is utilized to extract independent components. Through making a blind separation of the mixtures from four sensors, we had excitation signal, magnetic induction signal, power magnetism and integrated magnetic noise extracted, realizing a detection and extraction of the weak magnetic induction signal. The experiment result demonstrates the validity of the proposed method, which has better function than the traditional methods of weak signal detection.