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《Journal of South China University of Technology(Natural Science Edition)》 2010-01
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Wavelet Scalogram Reassignment and Matching Detection for LFM Echoes of Underwater Target

Wang Qiang1,2 Pan Xiang1 Wang Xiao-wei2(1.Department of Information Science and Electronic Engineering,Zhejiang University,Hangzhou 310027,Zhejiang,China;2.Department of Quality and Safety Engineering,China Jiliang University,Hangzhou 310018,Zhejiang,China)  
In order to improve the detection performance of small-scale underwater targets in a shallow-water reverberation-limited environment,broadband linear frequency-modulated(LFM) signals containing vast target information and weak reverberation background correlation are used to perform a time-frequency spectrogram reassignment and a matching detection for the target broadband echoes.Then,the time-frequency features of target echo respectively obtained by the short-time Fourier transform(STFT) and by the wavelet scalogram reassignment are compared,finding out that the reassignment helps to effectively separate the target signal and the coupled reverberation signal.Moreover,a time-frequency matching detector based on wavelet scalogram reassignment is designed accor-ding to the matched filter features.Simulated and test results indicate that the proposed method is superior to the traditional matched filtering method with a gain increase of about 4dB,and that it can accurately locate the underwater targets in reverberation-limited area with strong side-lobe suppression.
【Fund】: 国家自然科学基金资助项目(60902095);; 浙江省自然科学基金资助项目(Y1090672)
【CateGory Index】: TN911.23
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