摘要
以离散小波变换入手,利用小波分析的恒Q特性,提取了舰船噪声信号的子带能量分布特征。结果表明,由于各子带能量参数并不相互独立,基于离散小波变换的舰船噪声子带能量分布特征并不明显。因此,依据多分辨分析理论,对舰船辐射噪声信号进行了正交多分辨分解,并提取了舰船噪声子带能量分布特征。结果表明特征是显著的,该方法从整体上反映了舰船噪声信号能量分布特征。为了从细节上对噪声信号能量特征进行分析,提出了基于多分辨分析的子带能量密度特征提取方法。采用两类共8个噪声样本对噪声子带能量分布和能量密度特征提取方法进行检验,取得了比较理想的结果。
The feature of subband energy distribution for ship-radiated noise is extracted by discrete wavelet transform,since wavelet analysis has constant Q. The result indicates that the feature is not obvious,bacause the subband energy parameters are not independent.So,according to the theory of multi-resolution analysis,the multi-resolution of the ship-radiated noise is obtained,and the feature of subband energy distribution is extracted.The result shows that the feature is obvious.Through this method,the whole feature of energy distribution for ship-radiated noise is reflected.For extracting the detail feature,the method of extracting the feature of subband energy density distribution for shipradiated noise is presented.The method is based on multi-resolution analysis,through which obvious feature is gained on both high resolution scales and low resolution scales.
出处
《火力与指挥控制》
CSCD
北大核心
2009年第S1期23-25,共3页
Fire Control & Command Control
关键词
多分辨分析
子带能量分布
特征提取
multi-resolution analysis,subband energy distribution,feature extraction
