文章摘要
周士贞,曾向阳,王璐.水声信号动态阈值正交匹配追踪降噪方法[J].声学技术,2017,36(4):378~382
水声信号动态阈值正交匹配追踪降噪方法
Dynamic threshold orthogonal matching pursuit method for underwater acoustic signal de-noising
投稿时间:2016-10-10  修订日期:2017-02-21
DOI:10.16300/j.cnki.1000-3630.2017.04.014
中文关键词: 降噪  稀疏表示  动态阈值  正交匹配追踪
英文关键词: de-noising  sparse representation  dynamic threshold  orthogonal matching pursuit
基金项目:
作者单位E-mail
周士贞 西北工业大学航海学院, 陕西西安 710072 zszltj@163.com 
曾向阳 西北工业大学航海学院, 陕西西安 710072  
王璐 西北工业大学航海学院, 陕西西安 710072  
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中文摘要:
      为了对实时采集的水声信号进行数据压缩的同时实现信号降噪,提出了一种动态阈值正交匹配追踪方法(Dynamic Threshold Orthogonal Matching Pursuit,DTOMP)。该方法将稀疏分解原理应用于水声信号的预处理,通过在正交匹配追踪算法中引入阈值约束,并根据噪声分布特性将其分为两部分,用以控制预设置的参数。通过对加噪正弦信号、实测鲸鱼叫声和舰船辐射噪声信号的降噪实验,表明该方法能够在对原始水声信号进行压缩的同时提高信噪比,且在较宽的信噪比变化范围内比小波方法具有更好的降噪性能。
英文摘要:
      In order to achieve data compression and denoising of realtime collected underwater acoustic signal, this paper presents a dynamic threshold orthogonal matching pursuit (DTOMP) method. This method uses sparse representation for underwater signal pre-processing by applying threshold to greedy algorithm, meanwhile divides noise into two parts according to its characteristics to control preset parameters. Experimental researches on noise reduction of sinusoidal signal plus Gaussian noise, whale blows and ship radiated noise signal indicate that this method could improve the SNR and meanwhile compress original signal. Moreover, this method has better performance over wavelet denoising in wider dynamic range of SNR.
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