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小波变换因其在时-频域都具有表征信号局部特征的能力而成为非平稳信号分析的有力工具。选用Mallat小波作为母小波进行小波分析,得到舰船噪声信号的时频特征,体现出小波谱良好的时频定位能力。
Wavelet transform is a powerful tool for non-stationary signal analysis because of its capability of characterizing signal's local features in time-frequency domain. The Mallat wavelet is selected as the mother wavelet for wavelet analysis, and the time-frequency characteristics of the ship noise signal are obtained, which shows the good time-frequency localization ability of the wavelet spectrum.