为了完成对实测水下冲击信号的建模，充分提取信号声学特性是非常有必要的。本文以水池实测信号为研究对象，采用不同分析方法处理信号，最终发现希尔伯特黄变换（HHT）时频分析方法优势明显，在HHT时频谱图上可以看到非常清晰的时间、频率分布信息。在此基础上，使用多段线性调频（LFM）信号模拟实测水下冲击信号。比较实测信号与建模信号的HHT谱图可知，建模信号的频谱走势与实测信号相同，具有与实测水声信号非常相似的时频特性，验证了HHT时频分析的优势与建模效果。
In order to complete the modeling of the measured underwater impact signal, it is necessary to fully extract the acoustic characteristics of the signal. In this paper, the measured signal of the pool is taken as the research object, and different analysis methods are used to process the signal. Finally, it is found that the Hilbert Huang transform (HHT) time-frequency analysis method has obvious advantages, and very clear time and frequency distribution information can be seen on the HHT time-frequency spectrum. On this basis, the multi - segment linear frequency modulation (LFM) signal is used to simulate the measured underwater impact signal. Comparing the HHT spectra of the measured signal and the modeled signal, it can be concluded that the spectrum trend of the modeled signal is the same as the measured signal, and has the time-frequency characteristics very similar to the measured underwater acoustic signal, which verifies the advantages of HHT time-frequency analysis and the modeling effect.
2023,45(23): 122-126 收稿日期：2022-11-11
DOI：10.3404/j.issn.1672-7649.2023.23.021
分类号：TB561
作者简介：朱拥勇(1981-),男,助理研究员,研究方向为装备试验指挥与管理
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