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

作　　者：张同伟 杨坤德 马远良 

机构地区：[1]College of Marine,Northwestern Polytechnical University

出　　处：《Chinese Physics B》2010年第12期347-355,共9页中国物理B（英文版）

基　　金：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;the Northwestern Polytechnical University (NPU) Foundation for Fundamental Research

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.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 

分 类 号：O427[理学—声学]