Magnetic noise compensation using FIR model parameter estimation method

For magnetic noise compensation in the field of detection (magnetic anomaly detection) of magnetic dipole targets (such as sunken ships) by magnetic s ensors carried on an aircraft, a quadratic method of compensation of scalar magnetic sensors has been reported. However, in order to use a highly sens itive vector magnetic sensor such as a superconducting quantum interference device, it is necessary to obtain the scalar magnetic field (intensity of the magnetic field) accurately from the three-axis vector field. Also, in q uadratic compensation, a special flight is needed, imposing a significant b urden on the platform crew members for the acquisition of data for quadrati c compensation. In the present paper, an FIR (Finite Impulse Response) mode l parameter estimation method is proposed that allows magnetic noise compen sation for a three-axis vector magnetic sensor without a special flight. Th e experimental data confirm the effectiveness of the proposed FIR model par ameter estimation method. (C) 2001 Scripta Technica, Electron Comm Jpn Pt 3 , 85(3): 1-11, 2002.