| 基于小波包熵的船舶轴频电场信号消噪研究 |
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| 引用本文： | 胡鹏,包中华,龚沈光. 基于小波包熵的船舶轴频电场信号消噪研究[J]. 应用基础与工程科学学报, 2011, 19(4): 672-678. DOI: 10.3969/j.issn.1005-0930.2011.04.017 |
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| 作者姓名： | 胡鹏 包中华 龚沈光 |
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| 作者单位： | 海军工程大学兵器工程系,湖北武汉,430033 |
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| 基金项目： | 水中军用目标特性国防重点实验室基金项目资助(5144407105JB11) |
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| 摘 要： | 在海洋环境下,为有效地将微弱的轴频电场信号提取出来,本文在对小波包熵理论分析的基础上,提出了基于小波包熵的船舶轴频电场信号消噪方法.首先使用小波包变换对测量信号进行多子带分解,并将各子带分成几个子区间;然后计算各子带不同子区间的小波包熵,利用最大小波包熵自适应地选择各子带的阈值;最后对各子带的小波包系数进行阈值处理,并利用处理后的小波包系数对信号进行重构.通过实测数据和仿真数据对该消噪方法进行验证,结果表明此方法在低信噪比情况下能较好地将微弱的轴频电场信号从环境背景噪声中分离出来.
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| 关 键 词： | 轴频电场 小波包熵 小波包变换 消噪 |
Denoising the Signal of Ship Shaft-Rate Electric Field Based Based on Wavelet Packet Entropy |
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| HU Peng,BAO Zhonghua,GONG Shenguang. Denoising the Signal of Ship Shaft-Rate Electric Field Based Based on Wavelet Packet Entropy[J]. Journal of Basic Science and Engineering, 2011, 19(4): 672-678. DOI: 10.3969/j.issn.1005-0930.2011.04.017 |
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| Authors: | HU Peng BAO Zhonghua GONG Shenguang |
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| Affiliation: | HU Peng,BAO Zhonghua,GONG Shenguang (Department of Weaponry Engineering,Naval University of Engineering,Wuhan 430033,China) |
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| Abstract: | In order to effectively extract weak ship shaft-rate electric signal from ocean environmental electric field,a denoising method based on wavelet packet entropy has been proposed.Firstly,wavelet packet transform was used to decompose the received signal into several sub-band signals and each sub-band signal was divided into several segments.Then,the wavelet packet entropies of each sub-band signal's segments were calculated and the maximum entropy of each sub-band signal was selected to determine its thresho... |
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| Keywords: | shaft-rate electric field wavelet packet entropy wavelet packet transform denoise |
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