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Sound speed profile inversion using a horizontal line array in shallow water

Science China(Physics,Mechanics & Astronomy) 2015年第1期58卷 47-53页

作者： LI ZhengLin HE Li ZHANG RenHe LI FengHua YU YanXin LIN Peng State Key Laboratory of Acoustics Institute of Acoustics Chinese Academy of Sciences Haikou Laboratory of Acoustics Institute of Acoustics Chinese Academy of Sciences

It is better to use a simple configuration to enhance the matched-field inversion method based on a horizontal line applicability of ocean environment inversion in shallow water. A array （HLA） is used to retrieve the variation of sound speed profile. The performance of the inversion method is verified in the South China Sea in June, 2010. An HLA laid at bottom was used to receive signals from a bottom-mounted transducer. Inverted mean sound speed profiles from 9-hour long acoustic signals are in good agreement with measurements from two temperature chains at the sites of the source and receiver. The results show that an HLA can be used to monitor the variability of shallow-water sound speed profile.

关键词： acoustic inversion matched-field processing horizontal line array

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

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Chinese Physics B 2010年第12期19卷 347-355页

作者：张同伟杨坤德马远良 College of Marine Northwestern Polytechnical University

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.

关键词： time-reversal horizontal line array array depth

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