Patent ID: 6781380
Filing Date: 2004-08-24
Classification: G01V

Abstract:
An active magnetic anomaly sensing and processing system, comprising:a plurality of transceivers positioned at known relative positions, each of said plurality of transceivers including i) a transmitter for transmitting a magnetic field towards a target area wherein said magnetic field induces magnetic moments in a target in said target area which cause a magnetic anomaly field to propagate from the target, and ii) a sensor positioned a distance from the target for sensing magnetic field strength and producing a first output indicative thereof; a reference sensor positioned further from said target area than each said sensor from said plurality of transceivers, said reference sensor being capable of sensing magnetic field strength and producing a second output indicative thereof; means for activating and subsequently deactivating each said transmitter simultaneously to define a transmission time and a non-transmission time, respectively; and means for processing each said first output and said second output produced during each said non-transmission time to generate quantities indicative of presence, location and classification of the target in said target area.