舰船辐射噪声的调制谱中含有大量舰船固有特征量，可用于估算舰船的航速以及进行目标分类与识别。本文提出一种基于小波解调与1（1/2）维谱的联合分析方法，利用Morlet小波的带通滤波能力以及其实部与虚部正交特性提供的信号解调功能，得到信号的尺度包络谱图，选取其中含有调制信息的小波分量，通过1（1/2）谱分析可以得到舰船轴频的基频及谐波信息。实验数据结果表明，该联合方法可以有效的提取舰船辐射噪声中的调制特征信息，具有广阔的应用前景。
The modulation spectrum of ship-radiated noise contains a large number of inherent characteristics of the ship, which can be used to estimate the speed of ship and target classification and identification. This paper proposes a joint analysis method based on wavelet demodulation and 1(1/2)-dimensional spectrum. Firstly, the signal is demodulated by using the band-pass filtering capability of the Morlet wavelet and the signal demodulation function provided by the orthogonality of real and imaginary parts. The scale envelope spectrum is selected and the scale components containing the modulation information are selected, and 1(1/2) spectrum analysis is performed to obtain the basic frequency and harmonic information of the ship shaft frequency. The actual data results show that this method can effectively extract the modulation characteristic information in ship noise and has a good application prospect.
2019,41(8): 122-126 收稿日期：2018-06-12
DOI：10.3404/j.issn.1672-7649.2019.08.024
分类号：TN911.6
基金项目：国家自然科学基金（61601206）资助项目；江苏省自然科学基金（BK20160565）资助项目；江苏省高校自然科学研究（15KJB310003）资助项目
作者简介：赵冕(1994-),男,硕士研究生,研究方向为信号处理理论与技术应用
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