基于Hilbert-Huang变换的海豚声信号时频分析方法.doc

文档介绍：
基于 Hilbert-Huang 变换的海豚声信号时频
分析方法#
朱兆彤,许肖梅,汪启明,陈友淦**
5
10
(厦门大学水声通信与海洋信息技术教育部重点实验室,厦门,361005)
摘要:本文提出了一种基于 Hilbert-Huang 变换的海豚声信号时频分析方法。海豚声信号是
一种典型的非平稳信号,采用传统信号分析方法如短时傅立叶变换(STFT)进行处理时,
无法兼顾时间分辨率和频率分辨率。Hilbert-Huang 变换(HHT)可以克服传统信号时频分
析的缺点,得到有意义的非平稳信号的瞬时频率。仿真实验显示相对于 STFT 谱,HHT 谱
有更好的时频聚集特性。将 HHT 应用于实际海豚声信号分析后,得到的 HHT 谱时间分辨
率对比 STFT 谱有明显提高。
关键词:海洋物理;Hilbert-Huang 变换;海豚声信号
中图分类号::Q62
15
Time-frequency Analysis of Dolphin Sound Signal Based on
Hilbert-Huang Transform
Zhu Zhaotong, Xu Xiaomei, Wang Qiming, Chen Yougan
(Key Laboratory of Underwater munication and Marine Information Technology
20
25
30
35
40
(Xiamen University), Ministry of Education, Xiamen 361005)
Abstract: In this paper a Time-frequency analysis method for dolphin sound signal based on
Hilbert-Huang Transform (HHT) is proposed. Dolphin sound signal is a kind of typical
non-stationary signal. High time and frequency resolution can not be achieve at the same time by
using Short-time-fourier Transform (STFT). HHT can e this disadvantage of STFT and
achieve significant instantaneous frequency. Simulation result shows HHT has batter
time-frequency concentration paraed with STFT. and HHT spectrum of real
dolphin sound signal has batter time domain paraed with STFT spectrum.
Key words: Marine physics; Hilbert-Huang transform; dophine sound signal
0 引言
海豚拥有先进的声纳系统,其声纳系统既可用于定位与测距,