Detection of ferromagnetic target based on mobile magnetic gradient tensor system
Detection of ferromagnetic target based on mobile magnetic gradient tensor system
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DOI：
10.1016/j.jmmm.2015.11.034
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发表时间：
2016-03-15
影响因子：
2.7
通讯作者：
Ren Guoqan
中科院分区：
文献类型：
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作者：
Gang, Y. I. N.;Zhang Yingtang;Ren Guoqan
移动磁梯度张量系统的姿态变化严重影响梯度测量的精度，从而增加了目标检测的模糊性。提出了一种基于旋转不变量的铁磁目标定位与识别方法。首先，基于几何不变量导出单位磁矩矢量，使磁梯度张量的中间特征向量垂直于磁矩矢量和源传感器位移矢量；其次，根据磁矩矢量与源传感器位移夹角为旋转不变量的特点，导出了单位源传感器位移矢量；通过引入两个测点之间的位移矢量，从理论上推导了磁矩矢量和源-传感器位移矢量。为解决实际检测应用中存在的测量噪声问题，利用不同测点对应的不变量建立线性方程，得到磁矩矢量和源-传感器位移矢量的最小二乘解。仿真和主要验证实验结果表明了解析方法的正确性，以及最小二乘法的实用性。(C) 2015 Elsevier B.V.版权所有
Attitude change of mobile magnetic gradient tensor system critically affects the precision of gradient measurements, thereby increasing ambiguity in target detection. This paper presents a rotational invariant-based method for locating and identifying ferromagnetic targets. Firstly, unit magnetic moment vector was derived based on the geometrical invariant, such that the intermediate eigenvector of the magnetic gradient tensor is perpendicular to the magnetic moment vector and the source-sensor displacement vector. Secondly, unit source-sensor displacement vector was derived based on the characteristic that the angle between magnetic moment vector and source-sensor displacement is a rotational invariant. By introducing a displacement vector between two measurement points, the magnetic moment vector and the source-sensor displacement vector were theoretically derived. To resolve the problem of measurement noises existing in the realistic detection applications, linear equations were formulated using invariants corresponding to several distinct measurement points and least square solution of magnetic moment vector and source-sensor displacement vector were obtained. Results of simulation and principal verification experiment showed the correctness of the analytical method, along with the practicability of the least square method. (C) 2015 Elsevier B.V. All rights reserved.