Abstract
A method of locating a magnetic target based on geomagnetic total field is proposed. In the method, a conjugate gradient algorithm is introduced to eliminate the time-varying and uneven spatial distribution of geomagnetic total field. Then a structure of the measuring array of geomagnetic total field is designed. In the measuring array, the array aperture is a primary factor for the conjugate gradient algorithm. To determine an optimal aperture, we analyze the relationship between the array aperture and the localization accuracy. According to the localization theory based on geomagnetic total field, we simulate the process of determining an optimum array aperture. Based on the simulation, we propose the basis and principle of determining the optimum array aperture. To prove it, we use optically pumped magnetometers with different array apertures to carry out the experiments of locating a car in a suburb. Through the experiment, we get the experimental relationship between apertures and location accuracy. And the relationship agrees with the theory. The result shows that the method is feasible to determine the optimum aperture.
Highlights
It is important to locate targets by magnetic field in geological monitoring, energy and mineral exploration, rescue of plane crash, antisubmarine detection, and medical diagnosis [1,2,3]
In measuring geomagnetic total field, optically pumped magnetometers have the advantages of high resolution, long detection range, and no temperature drift [4,5,6]
It is feasible to locate the magnetic target by using the array of optically pumped magnetometer
Summary
It is important to locate targets by magnetic field in geological monitoring, energy and mineral exploration, rescue of plane crash, antisubmarine detection, and medical diagnosis [1,2,3]. In measuring geomagnetic total field, optically pumped magnetometers have the advantages of high resolution, long detection range, and no temperature drift [4,5,6]. It is feasible to locate the magnetic target by using the array of optically pumped magnetometer. In order to improve the location accuracy, the time-varying and uneven spatial distribution of geomagnetic total field must be eliminated [7, 8]. Some magnetic field changes caused by targets have been filtered out. When two sensors are close to each other, the magnetic field of targets will be filtered out more. All the information is missing when the array aperture is zero. The disturbance field cannot be filtered when the array aperture is infinite. It is necessary to determine an optimal array aperture which filters the interference field to the maximum extent and filters the target field to the minimum extent
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