The focusing performance with a horizontal time- reversal array at different depths in shallow water

doi:10.1088/1674-1056/19/12/124301

中国物理B ›› 2010, Vol. 19 ›› Issue (12): 124301-124301.doi: 10.1088/1674-1056/19/12/124301

The focusing performance with a horizontal time- reversal array at different depths in shallow water

张同伟, 杨坤德, 马远良

College of Marine, Northwestern Polytechnical University, Xi'an 710072, China

收稿日期:2010-04-06 修回日期:2010-06-29 出版日期:2010-12-15 发布日期:2010-12-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 10774119), the Program for New Century Excellent Talents in University (Grant No. NCET-08-0455), the Natural Science Foundation of Shaanxi Province of China (Grant No. SJ08F07), the Foundation of National Laboratory of Acoustics, and the Northwestern Polytechnical University （NPU） Foundation for Fundamental Research.

The focusing performance with a horizontal time- reversal array at different depths in shallow water

Zhang Tong-Wei(张同伟)^† Yang Kun-De(杨坤德), and Ma Yuan-Liang(马远良)

College of Marine, Northwestern Polytechnical University, Xi'an 710072, China

Received:2010-04-06 Revised:2010-06-29 Online:2010-12-15 Published:2010-12-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 10774119), the Program for New Century Excellent Talents in University (Grant No. NCET-08-0455), the Natural Science Foundation of Shaanxi Province of China (Grant No. SJ08F07), the Foundation of National Laboratory of Acoustics, and the Northwestern Polytechnical University （NPU） Foundation for Fundamental Research.

摘要/Abstract

摘要： The performance of time-reversal focusing with a horizontal line array at different depths is investigated by normal mode modeling and computer simulation. It is observed that the focusing performance of a bottom-mounted horizontal time-reversal array is much better than that of a horizontal time-reversal array at other depths in shallow water. The normal mode modeling is used to explain this result. The absolute values of the modes at different depths are compared. It is shown that the number of modes whose absolute values close to zero is smaller at the bottom than that at other depths. It means that the horizontal time-reversal array deployed at the bottom can sample more modes，obtain more information of the probe source and achieve better focusing performance. The numerical simulations of time-reversal focusing performance under various conditions, such as different sound speed profiles, and different bottom parameters, lead to similar results.

Abstract: The performance of time-reversal focusing with a horizontal line array at different depths is investigated by normal mode modeling and computer simulation. It is observed that the focusing performance of a bottom-mounted horizontal time-reversal array is much better than that of a horizontal time-reversal array at other depths in shallow water. The normal mode modeling is used to explain this result. The absolute values of the modes at different depths are compared. It is shown that the number of modes whose absolute values close to zero is smaller at the bottom than that at other depths. It means that the horizontal time-reversal array deployed at the bottom can sample more modes，obtain more information of the probe source and achieve better focusing performance. The numerical simulations of time-reversal focusing performance under various conditions, such as different sound speed profiles, and different bottom parameters, lead to similar results.

Key words: time-reversal, horizontal line array, array depth

中图分类号: (Ocean parameter estimation by acoustical methods; remote sensing; imaging, inversion, acoustic tomography)

43.30.Pc

43.60.Fg (Acoustic array systems and processing, beam-forming) 43.60.Tj (Wave front reconstruction, acoustic time-reversal, and phase conjugation)

张同伟, 杨坤德, 马远良. The focusing performance with a horizontal time- reversal array at different depths in shallow water[J]. 中国物理B, 2010, 19(12): 124301-124301.

Zhang Tong-Wei(张同伟) Yang Kun-De(杨坤德), and Ma Yuan-Liang(马远良). The focusing performance with a horizontal time- reversal array at different depths in shallow water[J]. Chin. Phys. B, 2010, 19(12): 124301-124301.

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The focusing performance with a horizontal time- reversal array at different depths in shallow water

The focusing performance with a horizontal time- reversal array at different depths in shallow water

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