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

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

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.

Keywords: time-reversal horizontal line array array depth

Received: 06 April 2010
Revised: 29 June 2010
Accepted manuscript online:

PACS:	43.30.Pc	(Ocean parameter estimation by acoustical methods; remote sensing; imaging, inversion, acoustic tomography)
	43.60.Fg	(Acoustic array systems and processing, beam-forming)
	43.60.Tj	(Wave front reconstruction, acoustic time-reversal, and phase conjugation)

Fund: 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.

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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 2010 Chin. Phys. B 19 124301

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

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