|Article title||MAGNETIC GRADIOMETRY DATA IN THREAT DETECTION PROBLEMS|
|Authors||A.K. Volkovitsky, E.V. Karshakov, B.V. Pavlov, M.Yu. Tkhorenko|
|Section||SECTION III. SYSTEMS AND MEANS OF COMMUNICATION, NAVIGATION AND GUIDANCE|
|Month, Year||02, 2016 @en|
|Abstract||The paper presents an application of magnetic gradiometry in detection problems of stationary and moving targets. An extensive literature review on utilization of magnetic measurements in different fields, such as archeology, geophysics, medicine, military technologies etc. is given. Based on the literature review a conclusion is drawn on usefulness of magnetic field gradient measurements usage in detection problems. Consideration is given to models and methods of magnetic field gradient measurements; the accuracy of proposed measuring schemes is estimated based on performance data of existing and possible future sensors. Use of tensor magnetic gradiometry in target detection problems is investigated carefully. An algorithm to localize a dipole magnetic source is given. It was shown that the algorithm detects the sensor-dipole direction with an ambiguity necessitating use of additional data. An application of moving magnetic gradient tensor sensors is considered separately. It is shown that use of several gradiometers let eliminate any ambiguity in the problem and determine the distance to a magnetic dipole and its dipole moment. Use of vector magnetic gradiometry data in detection problems is considered too. As in an above mentioned case of tensor magnetic gradiometry a problem of localizing a magnetic dipole source using measurement of its magnetic field gradient vector is analyzed. It is shown that utilization of measurements of the magnetic gradient vector provides the sensor-dipole direction with considerable errors not introducing an ambiguity. At the same time, a dipole source can be localized accurately if one knows the magnetic field vector itself. Furthermore, the paper discusses a choice of a sensor type and properties of stationary and moving magnetic detectors.|
|Keywords||Magnetic gradiometry; magnetic gradient tensor; magnetic gradient vector; threat detection problems.|
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