Convergence Property of Time Reversal Waves under Noisy Environment
Convergence Property of Time Reversal Waves under Noisy Environment
复制标题
噪声环境下时间反演波的收敛性
DOI：
10.1143/jjap.43.3180
复制
发表时间：
2004
影响因子：
1.5
通讯作者：
H. Ochi
中科院分区：
文献类型：
--
作者：
T. Shimura;H. Ochi
通过仿真和水槽实验研究了海洋中时反波（即相位共轭波）的收敛特性，特别是在时域上时反阵（TRA）的不同配置下的收敛特性。本文讨论了噪声环境下时反波的特性。采用Pekeris法的简正波解和抛物方程（PE）法对不同声速剖面进行了模拟，并进行了水槽实验与模拟结果进行了比较。结果表明：时间反转波即使在非常低的信噪比（SNR）下也可以收敛并在高SNR下将所需信号发送到焦点。水平距离越大，时间反转波的聚焦效果越好。如果声速剖面不同，则聚焦效果不会受到显著影响。
We have studied on the convergence property of time reversal waves (which are equal to phase conjugate waves) in the ocean, particularly in time domain with various configurations of time reversal array (TRA) through simulations and tank experiments. In this paper, the property of time reversal waves under noisy environment is discussed. Simulations were carried out with various sound velocity profiles using the Pekeris solution of the normal mode method and the parabolic equation (PE) method, and tank experiments were also conducted to compare with the simulation results. Results revealed the following. Time reversal waves even at very low signal noise to ratio (SNR) can converge and send the desired signal to the focus at high SNR. The focusing effect of time reversal waves is higher when the horizontal range is extended. If the sound velocity profile is different, the focusing effects are not considerably affected.