基于正交基函数-编辑距离的低信噪比下磁异常信号相似性度量方法  

A Similarity Measurement Method for Magnetic Anomaly Signal under Low Signal-to-Noise Based on Orthogonal Basis Function–Edit Distance

作　　者：邱景 欧津东 谢冬 王铮 杜杰卓 QIU Jing;OU Jindong;XIE Dong;WANG Zheng;DU Jiezhuo(Key Laboratory of Optoelectronic Technology and System of Ministry of Education,College of Optoelectronic Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学光电工程学院光电技术及系统教育部重点实验室,重庆400044

出　　处：《电子与信息学报》2022年第2期745-753,共9页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(51775070);中央高校基本科研业务费专项基金(2019CDJGFGD002)。

摘　　要：针对低信噪比下磁异常信号相似性难以度量的问题,该文提出基于正交基函数(OBF)分解和编辑距离法(EDR)相结合的OBF-EDR磁异常信号相似性度量方法。该方法通过对磁异常信号进行正交基函数分解得到离散基函数系数,根据背景噪声与基函数不相关的特性提高离散基函数系数信噪比,利用编辑距离法对离散基函数系数进行相似性计算从而间接实现对磁异常信号的相似性度量。仿真测试表明OBF-EDR方法相较于EDR算法可在更低信噪比情况下对磁异常信号进行相似性度量。Considering the problem that the similarity of magnetic anomaly signals is difficult to measure under low signal-to-noise ratio,a similarity measurement method OBF-EDR based on the combination of Orthogonal Basis Function(OBF)decomposition and Edit Distance on Real sequence(EDR)is proposed.This method obtains discrete basis function coefficients by decomposing the magnetic anomaly signals with orthogonal basis functions method.The signal-to-Noise Ratio(SNR)of discrete basis function coefficients is improved due to the uncorrelated characteristics of background noise and basis functions.EDR is used to measure the discrete coefficients of the basis function so as to measure indirectly the similarity of the magnetic anomaly signals.The simulation test shows that the OBF-EDR method can measure the similarity of magnetic anomaly signals at a lower SNR than the EDR algorithm.

关 键 词：正交基函数 编辑距离 磁场曲线 相似性度量 低信噪比 

分 类 号：TN911.7[电子电信—通信与信息系统] O441[电子电信—信息与通信工程]