Improvement of the signal to noise ratio of the magnetic detection system using the geological magnetic filter

A theory of the geological magnetic filter for improvement of the signal to noise ratio of the magnetic detection system has been developed. The geological magnetic filter takes two sequences of magnetic fields measured from the reference sensor and the detector sensor and calculates the correlations between them in the frequency domain. Using the filter, we can remove the coherent noises in the time domain and improve the signal to noise ratio of the magnetic anomaly detecting system. We show the ability of the geological magnetic filter under various circumstances through computer simulations. Numerical simulation results show that the geological magnetic filter can remove sensor misalignment effects and regular short range local noise as well as coherent noise.