Active waveguide Green’s function estimation with application to time-reversal focusing without a probe source in a range-independent waveguide
Active waveguide Green’s function estimation with application to time-reversal focusing without a probe source in a range-independent waveguide
复制标题
DOI：
10.1121/1.2355538
复制
发表时间：
2006-10
影响因子：
2.4
通讯作者：
S. Walker;W. Kuperman;P. Roux
中科院分区：
文献类型：
--
作者：
S. Walker;W. Kuperman;P. Roux
介绍了一种利用一对垂直线阵换能器在距离无关的浅海波导中任意位置产生时间反转焦点的方法。模态理论表明，可以重复迭代在由距离R分隔的一对VLA之间采样的声学响应，以估计在R的整数倍的距离处的声学响应。当与基于频率的可变范围TR方法相结合时，该过程导致长距离上的声学响应的虚拟采样，其可以应用于被动和主动浅海声学成像。在这里，该技术被应用于主动时间反转聚焦。阵列的几何形状的影响进行了探讨和模拟和实验结果。
A method is introduced for using a pair of vertical line transducer arrays (VLAs) to produce time-reversal (TR) foci at any location in a range-independent shallow-ocean waveguide without the need for a probe source. Modal theory suggests that the acoustic response sampled between a pair of VLAs separated by a range R can be repeatedly iterated to estimate the acoustic response at ranges that are integer multiples of R. When combined with the frequency-based variable-range-TR method, the process results in a virtual sampling of the acoustic response over long distances that can be applied to both passive and active shallow-ocean acoustic imaging. Here, the technique is applied to active time-reversal focusing. Array geometry effects are explored and simulation and experimental results are presented.