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Front. Inform. Technol. Electron. Eng.  2010, Vol. 11 Issue (5): 401-406    DOI: 10.1631/jzus.C0910212
    
Robust time reversal processing for active detection of a small bottom target in a shallow water waveguide
Xiang Pan1,2, Jian-long Li1,2, Wen Xu1,2, Xian-yi Gong1,2
1 Institute of Information and Communication Engineering, Zhejiang University, Hangzhou 310027, China 2 Zhejiang Provincial Key Laboratory of Information Network Technology, Hangzhou 310027, China
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Abstract  With the spatial-temporal focusing of acoustic energy, time reversal processing (TRP) shows the potential application for active target detection in shallow water. To turn the ‘potential’ into a reality, the TRP based on a model source (MS) instead of a physical probe source (PS) is investigated. For uncertain ocean environments, the robustness of TRP is discussed for the narrowband and broadband signal respectively. The channel transfer function matrix is first constructed in the acoustic perturbation space. Then a steering vector for time reversal transmission is obtained by singular value decomposition (SVD) of the matrix. For verification of the robust TRP, the tank experiments of time reversal transmission focusing and its application for active target detection are undertaken. The experimental results have shown that the robust TRP can effectively detect and locate a small bottom target.

Key wordsRobustness      Time reversal processing      Bottom target detection      Uncertain environment      Sonar     
Received: 16 April 2009      Published: 28 April 2010
CLC:  TB566  
Fund:  Project (Nos.  60702022 and 60872066) supported by the  National Natural Science Foundation of China
Cite this article:

Xiang Pan, Jian-long Li, Wen Xu, Xian-yi Gong. Robust time reversal processing for active detection of a small bottom target in a shallow water waveguide. Front. Inform. Technol. Electron. Eng., 2010, 11(5): 401-406.

URL:

http://www.zjujournals.com/xueshu/fitee/10.1631/jzus.C0910212     OR     http://www.zjujournals.com/xueshu/fitee/Y2010/V11/I5/401


Robust time reversal processing for active detection of a small bottom target in a shallow water waveguide

With the spatial-temporal focusing of acoustic energy, time reversal processing (TRP) shows the potential application for active target detection in shallow water. To turn the ‘potential’ into a reality, the TRP based on a model source (MS) instead of a physical probe source (PS) is investigated. For uncertain ocean environments, the robustness of TRP is discussed for the narrowband and broadband signal respectively. The channel transfer function matrix is first constructed in the acoustic perturbation space. Then a steering vector for time reversal transmission is obtained by singular value decomposition (SVD) of the matrix. For verification of the robust TRP, the tank experiments of time reversal transmission focusing and its application for active target detection are undertaken. The experimental results have shown that the robust TRP can effectively detect and locate a small bottom target.

关键词: Robustness,  Time reversal processing,  Bottom target detection,  Uncertain environment,  Sonar 
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