基于Hilbert-Huang变换的水下爆炸声信号分析

Analysis of Underwater Explosion Signals via Hilbert-Huang Transform

为了研究水下爆炸声信号的特征,进行了水下爆炸试验,并基于Hilbert-Huang变换(HHT)法对试验数据进行处理,得到了水下爆炸声信号的Hilbert谱。根据Hilbert谱对水下爆炸声信号进行分析,并对能量局部极值点的形成机理进行了探讨。结果表明,Hilbert谱能够清晰地表示出水下爆炸声信号的频率分布规律和能量的时频特性,局部极值点的形成是由于声线轨迹和海底相互作用的结果。

A test was conducted to study the characteristics of underwater explosion acoustic signals. The test data are processed in this paper with the Hilbert-Huang transform（HHT） method to obtain the Hilbert spectrum. According to the Hilbert spectrum, the underwater explosion acoustic signals are analyzed, and the formation mechanism of local energy extreme point is discussed. The results indicate that the Hilbert spectrum can show the frequency distribution and the time-frequency characteristic of energy of the underwater explosion acoustic signals. Local energy extreme point is formed due to interaction of acoustic ray trajectories and sea bottom.