基于正交基函数的矢量磁梯度异常探测  

Magnetic Vector Gradient Anomaly Detection Based on OBF

作　　者：马剑飞[1] 颜冰[1] 林春生[1] MA Jianfei;YAN Bing;LIN Chunsheng(School of Weaponry Engineering,Naval University of Engineering,Wuhan 430033,Hubei, China)

机构地区：[1]海军工程大学兵器工程学院,湖北武汉430033

出　　处：《兵工学报》2021年第11期2433-2443,共11页Acta Armamentarii

基　　金：总装备部“十三五”发展基金项目(TCGZ2018B002)。

摘　　要：磁异常探测技术是一种快速有效的非接触式感知手段。针对传统的标量正交基函数(OBF)检测器获取的磁场信息有限,而矢量OBF检测器得到的磁场信息受地球磁场晃动影响显著的问题,推导一种兼具丰富磁场信息以及抗晃动性能的矢量磁梯度OBF检测器。证明当测量噪声服从高斯独立同分布时,矢量OBF检测器相较于标量OBF检测器具有更低的检测虚警率,且空间采样长度是影响OBF检测器性能的关键因素。仿真和实测结果表明:矢量磁梯度OBF检测器相对于传统检测器具有更优的检测性能,降低空间采样长度可以明显提升其探测性能;矢量磁梯度OBF检测器在低信噪比条件下可以反演得到磁性目标的磁矢量梯度信号,利用粒子群参数估计算法能估计得到目标的位置参数和磁矩参数。The conventional scalar orthogonal basis function(OBF)detector is used to obtain limited magnetic field information,while the vector OBF detector is significantly influenced by the swaying motion of magnetic field of the earth.To solve above problems,an OBF detector with rich magnetic field information and anti-swaying performance is presented for vector magnetic gradient detection.When measurement noise obeys Gauss's independent distribution,the vector OBF detector has the lower false alarm rate compared with scalar OBF detector,and the spatial sampling length is the main factor affecting the performance of OBF detector.The simulated and experimental results show that the vector magnetic gradient OBF detector has better detection performance than traditional detector,and the performance of the detector can be improved by shortening the spatial sampling length.In addition,based on the vector magnetic gradient signal retrieved by the vector magnetic gradient OBF detector under the condition of low signal-to-noise ratio,the position parameters and magnetic moment parameters of target can be obtained by the particle swarm optimization(PSO)parameter estimation algorithm.

关 键 词：磁梯度异常 正交基函数 矢量磁梯度 参数估计算法 空间采样长度 

分 类 号：TJ617[兵器科学与技术—武器系统与运用工程]