| 林正青,牟林,彭圆,张风珍.时频分布重排方法在水下目标回声识别中的应用[J].,2014,33(1):87-94 |
| 时频分布重排方法在水下目标回声识别中的应用 |
| Application of time-frequency distribution reassignment method to underwater target echo classification |
| 投稿时间：2013-04-24 修订日期：2014-01-14 |
| 中文摘要: |
| 特征提取是目标识别的关键技术,本文提出了一种基于时频分布重排理论的Wigner-Ville分布(WD)特征提取方法。选择WD作为研究问题的切入点,使用核函数方法,通过平滑伪Wigner-Ville分布(SPWD)抑制交叉项；为解决引入核函数导致信号时频聚集性下降问题,我们采用时频重排方法来增强目标的时频聚集性,最后用海上实验数据对本文方法进行了有效性检验。实验结果表明,本文提出的SPWD时频重排特征提取方法具有：⑴可有效抑制WD固有的交叉项；⑵增强目标回声信号时频聚集性；⑶可明显地提高水下目标识别率。该方法具有一定的应用推广价值,为解决水下目标识别问题提供了很好的思路。 |
| 英文摘要: |
| Feature extraction is a key technology for target classification. In this paper a Wigner-Ville distribution feature extraction method based on time-frequency reassignment theory is proposed. The breakthrough point of the research problem is WD. The kernel function method and the smoothed pseudo Wigner-Ville distribution(SPWD) are used to restrain the cross items. To solve the problem of which the kernel function method may cause signal time-frequency aggregation to decrease, a time-frequency distribution reassignment method is applied to enhance the target time-frequency aggregation. Finally, the effectiveness of the method is testified by sea experiment data. The experimental results show that the advantages of SPWD time-frequency distribution reassignment feature extraction method are as follows: (1)restraining the cross items more effectively; (2)enhancing target echo time-frequency aggregation; (3)increasing target classification rate. This paper provides a good method for underwater target classification which has promising application prospects. |
| DOI：10.11684/j.issn.1000-310X.2014.01.013 |
| 中文关键词: 时频分布,重排,Wigner-Vill分布 |
| 英文关键词: Time-frequency distribution, Reassignment, Wigner-Ville distribution |
| 基金项目:国家重点实验室基金项目(51303020307-8)（4010201030301） |
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