Analysis of ship magnetic field surveying based on two Tri-axial Magnetic Sensors

When tri-axial magnetic sensor swaying with the moored-mine, the measured magnetic field´s module will have a big error. So change of magnetic field caused by the ship may be submersed by the background noise. For solve this problem, it constructs the measurement equation of ship´s magnetic field on the base of moored-mine´s swaying model. And the simulation result given by the MATLAB proved that it can detect the change of magnetic field´s module from the difference between two Tri-axial Magnetic Sensors´ measurement.