文章摘要
陈羽,杨鹏飞,王伟,倪明.浅海波导中垂直时反线阵聚焦研究[J].声学技术,2011,(1):41~45
浅海波导中垂直时反线阵聚焦研究
Research on vertical linear time-reversing array retrofocusing in shallow water
投稿时间:2010-01-26  修订日期:2010-03-28
DOI:
中文关键词: 垂直阵  简正波  时间反转
英文关键词: vertical linear array  normal mode  time-reversal
基金项目:
作者单位E-mail
陈羽 国防科学与技术大学光电工程学院, 长沙, 410073 chenyulm@163.com 
杨鹏飞 国防科学与技术大学光电工程学院, 长沙, 410073  
王伟 国防科学与技术大学光电工程学院, 长沙, 410073  
倪明 国防科学与技术大学光电工程学院, 长沙, 410073  
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中文摘要:
      在浅海波导中,垂直阵可以跨越整个波导,并能对大多数简正波模态进行精确采样。在给定声源及海洋环境信息的条件下,通过MOATL简正波模型仿真计算出到达垂直时反阵位置处的波形,即垂直时反阵的接收信号,将接收信号时间上取反,通过以KRAKEN简正波模型计算得出的返回声信道,在声源处取得了较好的聚焦效果。并分析了垂直阵基元数、基元间隔以及发射信号频宽的变化对时反聚焦效果造成的影响。得出适当增大基元数、基元间隔以及发射信号频宽能改善时反聚焦效果的结论。
英文摘要:
      Vertical linear array can span the whole wave-guide and can sample most normal modes accurately in the shallow water wave-guide.This paper introduces a method that is using MOATL normal mode to simulate a signal in the place of vertical linear array as its take-over signal.Then reverse this signal and make it pass through the reverse wave channel modeled by KRAKEN normal mode.Obvious retrofocusing effects can be seen in the place of sound source.Then the paper analyses how retrofocusing effect changes when the sensor number,the distance between sensors,and the width of source wave frequency alter.Finally it concludes that augmenting the sensor number,the distance between sensors,and the width of source wave frequency properly can improve the time-reversal retrofocusing effect.
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