AMR Magnetometer Data on Moving Military Vehicles at Aberdeen Proving Ground

Abstract : We have collected magnetic signature data on three vehicles of military interest at Aberdeen Proving Ground, MD, in September 1999 using low cost, commercial anisotropic magnetoresistance sensors. Vehicles were driven passed sensors that were located at 12 ft and 36 ft from the center of the track. The magnetic signatures that were obtained were different for the three different vehicles investigated, although some details of the signal were lost at the larger distance. The total field from the tank varied as 1/r(exp 3) where r is the distance between the sensor and the vehicle. The different magnetic signals generated from a tank moving backward and forward, rotating the tank's turret, and raising and lowering the tank's gun were clearly distinguishable. The signals from the tank had nearly the same values at the 12 ft and 36 ft distances, when their values were normalized by the peak values, and time axis was normalized by time interval between half-maximum amplitude points.