文章摘要
鞠东豪,李宇,张万达,张春华.基于变分模态分解的水下目标噪声特征提取及分类[J].声学技术,2021,40(2):181~187
基于变分模态分解的水下目标噪声特征提取及分类
Extraction of noise feature and classification of underwater targets based on variational mode decomposition algorithm
投稿时间:2019-12-17  修订日期:2020-03-24
DOI:10.16300/j.cnki.1000-3630.2021.02.005
中文关键词: 水下被动目标  分类  变分模态分解(VMD)  希尔伯特变换  分类器
英文关键词: underwater passive target  classification  variational mode decomposition(VMD)  Hilbert transformation (HT)  classifier
基金项目:国防基础科研计划重大项目(JCKY2016206A003);国家自然科学基金(11904386)
作者单位E-mail
鞠东豪 中国科学院声学研究所, 北京 100190
中国科学院大学, 北京 100039
中国科学院先进水下信息技术重点实验室, 北京 100190 
 
李宇 中国科学院声学研究所, 北京 100190
中国科学院先进水下信息技术重点实验室, 北京 100190 
 
张万达 中国船舶工业系统工程研究院, 北京 100036  
张春华 中国科学院声学研究所, 北京 100190
中国科学院先进水下信息技术重点实验室, 北京 100190 
zch@mail.ioa.ac.cn 
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中文摘要:
      当信号中存在异常事件引起的间歇现象时,传统的经验模态分解算法常易产生较为严重的模态混叠现象,严重影响目标特征提取的性能。文章在水下被动目标信号特征分析提取中引用变分模态分解算法。该方法能够自适应地对信号频带进行切割,极大程度上避免了传统模态分解算法所产生的模态混叠现象,提高了对目标特征提取的准确性,同时也避免了无效计算。此外,还利用相关性阈值进行模态选择,一定程度上消除干扰模态。在对变分模态分解(Variational Mode Decomposition,VMD)的各阶模态函数进行希尔伯特变换的基础上,提出一种基于变分模态分解和希尔伯特变换(VDM-Hilbert Transformation,VDM-HT)联合处理的特征集进行目标分类。采用四种分类器对3种水下目标噪声信号进行分类。结果表明,VMD-HT算法所提取的特征集相比其他模态分解算法具有更好的分类性能。
英文摘要:
      When there are intermittent phenomena caused by abnormal events in the signal, the traditional empirical mode decomposition (EMD) algorithms often produce more severe mode aliasing, which significantly affects the performance of target feature extraction. In this paper, the variational mode decomposition (VMD) algorithm is used in the feature analysis and extraction of underwater target signals. This method can adaptively cut the signal frequency band, which largely avoids the mode aliasing phenomenon produced by the traditional EMD algorithm, and improves the accuracy of target feature extraction. At the same time, invalid calculations are avoided. In addition, the correlation threshold is used to select the modes to eliminate the interference modes to a certain extent. Based on the Hilbert transform of the mode function of each order of VMD, a VMD-HT feature set is proposed for target classification. Four classifiers are used to classify and recognize three kinds of underwater target noise signals. The comparison of classification results show that the VMD-HT feature set has better classification performance than other mode decomposition algorithms.
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