Numerical Simulation of Target Range Estimation Using Ambient Noise Imaging with Acoustic Lens
Numerical Simulation of Target Range Estimation Using Ambient Noise Imaging with Acoustic Lens
复制标题
利用声透镜环境噪声成像进行目标距离估计的数值模拟
DOI：
10.1143/jjap.49.07hg01
复制
发表时间：
2010
影响因子：
1.5
通讯作者：
N. Endoh
中科院分区：
文献类型：
--
作者：
K. Mori;H. Ogasawara;T. Nakamura;T. Tsuchiya;N. Endoh
在环境噪声成像（ANI）中，目标图像的每个像素都通过单色或伪彩色映射来表示其在每个方向上的声强度。该强度是通过测量目标物体的反射波或散射波而获得的，以海洋背景噪声作为声源。在使用声透镜的情况下，ANI 系统会创建类似 C 模式的图像，其中接收器排列在焦平面上，每个像素的颜色对应于每个接收器输出的强度。该方法没有考虑估计目标范围，因为无法通过像主动成像声纳这样的方法测量换能器和目标之间的行进时间。在本研究中，我们尝试使用带有声透镜的 ANI 系统来估计目标范围。在这里，我们基于时间反转镜的原理进行了声音传播的数值模拟。首先，我们使用二维 (2D) 时域有限差分 (FDTD) 方法计算由大量点源产生的声学噪声场中的刚性目标物体的散射波，而不是前向传播中的实际海洋测量。然后在每个接收器上记录透镜会聚的散射波的时间序列。假设散射波的时间反转波从每个接收器位置再辐射，声压分布也使用 2D FDTD 方法在向后传播中计算。使用带有声透镜的 ANI 系统可以估计目标范围，因为再辐射声压场的最大位置接近目标位置。
In ambient noise imaging (ANI), each pixel of a target image is mapped by either monochrome or pseudo color to represent its acoustic intensity in each direction. This intensity is obtained by measuring the target object's reflecting or scattering wave, with ocean background noise serving as the sound source. In the case of using an acoustic lens, the ANI system creates a C-mode-like image, where receivers are arranged on a focal plane and each pixel's color corresponds to the intensity of each receiver output. There is no consideration for estimating a target range by this method, because it is impossible to measure the traveling time between a transducer and a target by a method like an active imaging sonar. In this study, we tried to estimate a target range using the ANI system with an acoustic lens. Here, we conducted a numerical simulation of sound propagation based on the principle of the time reversal mirror. First, instead of actual ocean measurements in the forward propagation, we calculated the scattering wave from a rigid target object in an acoustic noise field generated by a large number of point sources using the two-dimensional (2D) finite difference time domain (FDTD) method. The time series of the scattering wave converged by the lens was then recorded on each receiver. The sound pressure distribution assuming that the time-reversed wave of the scattering wave was reradiated from each receiver position was also calculated using the 2D FDTD method in the backward propagation. It was possible to estimate a target range using the ANI system with an acoustic lens, because the maximum position of the reradiated sound pressure field was close to the target position.
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DOI：
--
发表时间：
2006
期刊：
The proceeding CD-ROM of Techno-Ocean 2006 / 19th JASNAOE Ocean Engineering Symposium
影响因子：
--
作者：
志村拓也;越智 寛;渡邊佳孝
通讯作者：
渡邊佳孝
法向入射双凹声学透镜聚焦声场的 3-D FDTD 分析
影响因子：
1.5
作者：
K. Mori;Toshiaki Nakamura;T. Yokoyama;A. Hasegawa
通讯作者：
A. Hasegawa
影响因子：
1.5
作者：
T. Shimura;H. Ochi;Yoshitaka Watanabe;T. Hattori
通讯作者：
T. Hattori
影响因子：
1.5
作者：
T. Shimura;H. Ochi;Yoshitaka Watanabe
通讯作者：
Yoshitaka Watanabe
DOI：
10.1143/jjap.41.4739
发表时间：
2002
期刊：
影响因子：
--
作者：
T. Kikuchi;Kohji Futa;T. Tsuchiya;J. Naoi
通讯作者：
J. Naoi