Extraction of Target Scatterings from Received Transients on Target Detection Trial of Ambient Noise Imaging with Acoustic Lens

2012 ◽  
Vol 51 (7S) ◽  
pp. 07GG10 ◽  
Author(s):  
Kazuyoshi Mori ◽  
Hanako Ogasawara ◽  
Toshiaki Nakamura ◽  
Takenobu Tsuchiya ◽  
Nobuyuki Endoh
Keyword(s):  
Target Detection ◽  
Ambient Noise ◽  
Acoustic Lens

Extraction of Target Scatterings from Received Transients on Target Detection Trial of Ambient Noise Imaging with Acoustic Lens

2012 ◽  
Vol 51 ◽  
pp. 07GG10 ◽  
Author(s):  
Kazuyoshi Mori ◽  
Hanako Ogasawara ◽  
Toshiaki Nakamura ◽  
Takenobu Tsuchiya ◽  
Nobuyuki Endoh
Keyword(s):  
Target Detection ◽  
Ambient Noise ◽  
Acoustic Lens

Design and Convergence Performance Analysis of Aspherical Acoustic Lens Applied to Ambient Noise Imaging in Actual Ocean Experiment

2011 ◽  
Vol 50 (7) ◽  
pp. 07HG09 ◽  
Author(s):  
Kazuyoshi Mori ◽  
Hanako Ogasawara ◽  
Toshiaki Nakamura ◽  
Takenobu Tsuchiya ◽  
Nobuyuki Endoh
Keyword(s):  
Performance Analysis ◽  
Ambient Noise ◽  
Acoustic Lens ◽  
Convergence Performance

scholarly journals Automatic Acoustic Target Detecting and Tracking on the Azimuth Recording Diagram with Image Processing Methods

Sensors ◽  
2019 ◽  
Vol 19 (24) ◽  
pp. 5391
Author(s):  
Fan Yin ◽  
Chao Li ◽  
Haibin Wang ◽  
Fan Yang
Keyword(s):  
Image Processing ◽  
Real Time ◽  
Target Detection ◽  
Ambient Noise ◽  
Arrival Direction ◽  
Processing Methods ◽  
Acoustic Target ◽  
Real Time Tracking ◽  
Passive Acoustic ◽  
Target Detecting

Passive acoustic target detection has been a hot research topic for a few decades. Azimuth recording diagram is one of the most promising techniques to estimate the arrival direction of the interested signal by visualizing the sound wave information. However, this method is challenged by the random ambient noise, resulting in low reliability and short effective distance. This paper presents a real-time postprocessing framework for passive acoustic target detection modalities by using a sonar array, in which image processing methods are used to automate the target detecting and tracking on the azimuth recording diagram. The simulation results demonstrate that the proposed approach can provide a higher reliability compared with the conventional ones, and is suitable for the constraints of real-time tracking.

THEORY OF ACOUSTIC IMAGING IN THE OCEAN WITH AMBIENT NOISE

1993 ◽  
Vol 01 (01) ◽  
pp. 117-140 ◽  
Author(s):  
MICHAEL J. BUCKINGHAM
Keyword(s):  
Ambient Noise ◽  
Imaging System ◽  
Sole Source ◽  
Acoustic Imaging ◽  
Accurate Approximation ◽  
Theoretic Analysis ◽  
Acoustic Lens ◽  
Full Wave ◽  
Line Array ◽  
Incoherent Imaging

Following a recent experiment in which ambient noise (acoustic daylight) was used as the sole source of acoustic illumination for detecting objects in the ocean, a full wave-theoretic analysis is presented in this article of the visibility of a pressure-release spherical target when illuminated by ambient noise showing various degrees of anisotropy. The basis of the analysis is a new, accurate approximation for the Green's function representing the field around the sphere. From this expression, an analysis of the acoustic contrast is developed, as observed at the output of an endfire line array, which constitutes the acoustic lens. Our essential conclusion is that, even in isotropic noise, which presents one of the least favourable conditions for incoherent imaging, the visibility of the sphere (i.e. the ratio of intensities with the sphere present and absent) is approximately 4 dB. This is consistent with our early experimental observations, and is adequate to form the basis of an acoustic daylight imaging system.

Numerical Simulation of Target Range Estimation Using Ambient Noise Imaging with Acoustic Lens

2010 ◽  
Vol 49 (7) ◽  
pp. 07HG01 ◽  
Author(s):  
Kazuyoshi Mori ◽  
Hanako Ogasawara ◽  
Toshiaki Nakamura ◽  
Takenobu Tsuchiya ◽  
Nobuyuki Endoh
Keyword(s):  
Numerical Simulation ◽  
Ambient Noise ◽  
Target Range ◽  
Range Estimation ◽  
Acoustic Lens
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