| Novel Way to Suppress Reverberation Based on Fractional Fourier Transform |
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| 作者姓名： | 邓兵 陶然 齐林 刘锋 |
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| 作者单位： | [1]DepartmentofElectronicEngineering,SchoolofInformationScienceandTechnology,BeijingInstituteofTechnology,Beijing100081,China [2]DepartmentofElectronicEngineering,NavalAeronauticalEngineeringInstitute,Yantai,Shandong264001,China |
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| 基金项目： | theNationalNaturalScienceFoundation ( 69972 0 0 3 ) |
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| 摘 要： | A novel method of anti-reverberation based on the fractional Fourier transformation is presented. By virtue of the fact that it has a good focus property in the fractional Fourier domain, the linearly frequency modulation (LFM) signal can be seperated from the reverberation through a swept-frequency filter. With the actual reverberation data and the LFM pulse for seperation, the good results are obtained : the reverbareation is largely removed, and relatively the better performance is shown under the lower signal reverberation ratio (SRR). Based on the theorical analyses and simulation results, two schemes for detecting targets are provided: one is the detection of the LFM echo from the target with a threshold by means of this method directly; the other is to detect the target by means of other methods, with this method performing pre-process to increase SRR, which need enoughlarge SRR.
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| 关 键 词： | 混响 分数傅立叶变换 线性频率调制 Wigner-Ville分布 海床 电声学 噪声 声纳 |
| 收稿时间： | 2003/6/17 0:00:00 |
Novel Way to Suppress Reverberation Based on Fractional Fourier Transform |
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| DENG Bing,TAO Ran,QI Lin and LIU Feng.Novel Way to Suppress Reverberation Based on Fractional Fourier Transform[J].Journal of Beijing Institute of Technology,2003,12(4):420-424. |
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| Authors: | DENG Bing TAO Ran QI Lin and LIU Feng |
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| Affiliation: | 1. Department of Electronic Engineering, School of Information Science and Technology, Beijing Institute of Technology, Beijing 100081, China;Department of Electronic Engineering, Naval Aeronautical Engineering Institute, Yantai, Shandong 264001, China
2. Department of Electronic Engineering, School of Information Science and Technology, Beijing Institute of Technology, Beijing 100081, China |
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| Abstract: | A novel method of anti-reverberation based on the fractional Fourier transformation is presented. By virtue of the fact that it has a good focus property in the fractional Fourier domain, the linearly frequency modulation (LFM) signal can be seperated from the reverberation through a swept-frequency filter. With the actual reverberation data and the LFM pulse for seperation, the good results are obtained: the reverbareation is largely removed, and relatively the better performance is shown under the lower signal reverberation ratio (SRR). Based on the theorical analyses and simulation results, two schemes for detecting targets are provided: one is the detection of the LFM echo from the target with a threshold by means of this method directly; the other is to detect the target by means of other methods, with this method performing pre-process to increase SRR, which need enough large SRR. |
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| Keywords: | fractional Fourier transform Wigner-Ville distribution reverberation |
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