Magnetic Vector Gradient Anomaly Detection Based on OBF

doi:10.3969/j.issn.1000-1093.2021.11.017

Abstract

Abstract: 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.

Key words: magneticgradientanomaly, orthonormalbasisfunction, vectormagneticgradient, parameterestimationalgorithm, spatialsamplinglength

CLC Number:

TJ61⁺7

MA Jianfei， YAN Bing， LIN Chunsheng. Magnetic Vector Gradient Anomaly Detection Based on OBF[J]. Acta Armamentarii, 2021, 42(11): 2433-2443.

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第42卷第11期2021 年11月
兵工学报ACTA ARMAMENTARII
Vol.42No.11Nov.2021

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