| 水声信号时频分析方法比较及应用研究 |
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| 引用本文： | 姚玉玲,王宁,石洪华,谭君红.水声信号时频分析方法比较及应用研究[J].中国海洋大学学报(自然科学版),2011,41(11):115-119,123. |
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| 作者姓名： | 姚玉玲 王宁 石洪华 谭君红 |
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| 作者单位： | 中国海洋大学信息科学与工程学院,山东青岛,266100 |
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| 摘 要： | 浅海中的宽带水声信号传播呈现出频散的特点,通过高分辨率的时频分析方法可以刻画频散曲线。通过数值仿真和实验数据处理,对比分析几类常用的时频分析方法在提取宽带声信号频散曲线方面的性能。结果表明:STFT时频局部化精度不够高;在较强频散的情况下,DSTFT时频分辨率较高。WVD时频聚集性最好,但是有严重的交叉项干扰;固定核函数的CWD较好地抑制交叉项,时频分辨率虽优于STFT,但弱化了时频聚集性;AOK时频分布采用自适应高斯核函数,在抑制交叉项的同时,时频聚集性较好,有望较好地用于提取信号频散曲线。
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| 关 键 词： | WVD 自适应最优核 DSTFT |
A Comparison of Time-Frequency Analysis Method and Their Applications to Underwater Acoustic Signal |
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| YAO Yu-Ling,WANG Ning,SHI Hong-Hua,TAN Jun-Hong.A Comparison of Time-Frequency Analysis Method and Their Applications to Underwater Acoustic Signal[J].Periodical of Ocean University of China,2011,41(11):115-119,123. |
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| Authors: | YAO Yu-Ling WANG Ning SHI Hong-Hua TAN Jun-Hong |
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| Institution: | YAO Yu-Ling,WANG Ning,SHI Hong-Hua,TAN Jun-Hong(College of Information Science and Engineering,Ocean University of China,Qingdao 266100,China) |
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| Abstract: | An acoustic wave in a shallow water ocean channel is proved dispersive.The dispersive property can be got by high resolution time-frequency analysis method.At present,there are a lot of time-frequency analysis methods.Short time Fourier transform(STFT),Wigner-Ville distribution(WVD),Cohen class distribution(CWD),adaptive optimum kernel time-frequency representation(AOK),Dispersion-based short-time Fourier transform(DSTFT) are studied in this paper.By using these methods to a simulated acoustic signal and an... |
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| Keywords: | WVD adaptive optimum kernel DSTFT |
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