基于相似性度量的磁异信号匹配检测算法  

Matching detection algorithm for magnetic anomalysignal based on similarity measure

作　　者：刘一飞 张宁[1] 赵鹤达 徐磊 林朋飞 Liu Yifei;Zhang Ning;Zhao Heda;Xu Lei;Lin Pengfei(Academy of Weaponry Engineering,Naval University of Engineering,Wuhan 430033,China;Unit 91977 of PLA,Beijing 100000,China;Department of Hydropower and Chemical Defense,Dalian Naval Academy,Dalian 116000,China)

机构地区：[1]海军工程大学兵器工程学院,武汉430033 [2]中国人民解放军91977部队,北京100000 [3]海军大连舰艇学院水武与防化系,大连116000

出　　处：《电子测量与仪器学报》2022年第9期103-110,共8页Journal of Electronic Measurement and Instrumentation

基　　金：军委科技委创新特区基金(20-163-00-TS-013-002-11)项目资助。

摘　　要：针对现有的磁异目标差值匹配检测算法在低信噪比下效果较差的问题,提出了一种基于相似性度量的匹配检测算法,通过构建衡量序列局部相似性的函数对实时磁异信号和背景场信号进行匹配处理,再利用小波包去噪进一步提高信噪比,最后将处理后的信号输入到OBF检测器中完成目标实时检测。研究结果表明在虚警率为0.42%下当输入信号信噪比为-9 dB时,该算法的检测率仍在90%左右,其在低信噪比下的检测效果明显优于差值匹配检测。Aiming at the problem that the existing difference matching detection algorithm of magnetic anomaly targets has poor effect under low SNR, a matching detection algorithm based on similarity measure is proposed. The similarity function is used to match the real-time signal and the background field signal, then the wavelet packet denoising is used to further improve the SNR. Finally, the processed signal is input into the OBF detector to complete the real-time target detection. The research indicates that when the false alarm rate is 0.42%, and the SNR of the input signal is-9 dB, the detection rate of the algorithm is still around 90%, and its detection effect under low SNR is obviously better than that of difference matching detection.

关 键 词：磁异信号 匹配检测 相似性度量 小波包去噪 正交基函数 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置] TN911.23[自动化与计算机技术—控制科学与工程]