Abstract
In the method of target localization based on magnetic anomalies, the scheme of vector field localization and experimental research are significant. Because more information of magnetic field can be measured by vector sensors, the position of the target can be directly calculated by the equations. However, the vector magnetic anomaly generated by the target is difficult to measure. And the detection range is small due to the low sensitivity of vector sensors. A method for target localization based on the total geomagnetic field is proposed. Its advantages are that the measurement of total magnetic field is not affected by the orientation of the total field sensors and the detection range is large due to their high sensitivity. In this paper, we focus on the localization using the array with the total field magnetometers. And we design an array structure with the total field magnetometers. Then, we obtain the higher order nonlinear equations for the target localization based on this array. The numerical method is used to solve the equations. Meanwhile, we present a method for eliminating the effect of geomagnetic field variations and uneven spatial distribution. In suburban roads, localization experiments were carried out. And the results showed that the relative error of target localization is less than 5% by using the proposed method.
Highlights
Geomagnetic field is an important physical quantity, which reflects the evolution of the earth and the evolution of the geological structure
We present an array with the total field magnetometers and propose a method for the localization of the target based on the total geomagnetic field
The magnetic target is considered as the magnetic dipole and the nonlinear equations for the target localization are obtained
Summary
Geomagnetic field is an important physical quantity, which reflects the evolution of the earth and the evolution of the geological structure. Due to the effect of the geomagnetic field, a target containing ferromagnetic material can generate a magnetic anomaly. It has an important application to locate the target based on the magnetic anomaly, which can be used in terms of energy mineral exploration, geological monitoring, shipwreck search and rescue, antisubmarine mines, medical diagnosis, and so forth. The detection technology using magnetic anomalies generated by a target has become an important trend in target detection [1,2,3,4,5,6,7]. We can describe the target with six parameters, three describing the position and three describing the magnetic moments of the target. The parameters of the target can be estimated by measuring the total magnetic field or the vector magnetic field
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