Acoustic Target Strength Analysis for Underwater Vehicles Covering Near Field Spherical Wave Source Originated Multiple Bounce Effects

2010 ◽  
Vol 47 (2) ◽  
pp. 196-209
Author(s):  
Byung-Gu Cho ◽  
Suk-Yoon Hong ◽  
Hyun-Wung Kwon
Keyword(s):  
Near Field ◽  
Spherical Wave ◽  
Underwater Vehicles ◽  
Target Strength ◽  
Strength Analysis ◽  
Wave Source ◽  
Acoustic Target

Development of acoustic target strength near-field equation for underwater vehicles

2018 ◽  
Vol 233 (3) ◽  
pp. 714-721
Author(s):  
Jae-Yong Kim ◽  
Suk-Yoon Hong ◽  
Byung-Gu Cho ◽  
Jee-Hun Song ◽  
Hyun-Wung Kwon
Keyword(s):  
Field Equation ◽  
Plane Wave ◽  
Pressure Field ◽  
Near Field ◽  
Target Strength ◽  
Detection Capability ◽  
Weapon Systems ◽  
Active Sonar ◽  
Acoustic Target ◽  
Definition Of

For modern weapon systems, the most important factor in survivability is detection capability. Acoustic target strength is a major parameter of the active sonar equation. The traditional target strength equation used to predict the re-radiated intensity for the far field is derived with a plane-wave assumption. In this study, a near-field target strength equation was derived without a plane-wave assumption for a polygonal plate. The target strength equation for polygonal plates, which is applicable to the near field, is provided by the Helmholtz–Kirchhoff formula that is used as the primary equation for solving the re-radiated pressure field. A generalized definition of the sonar cross section is suggested that is applicable to the near field. In comparison experiments for a cylinder, the target strength equation for polygonal plates in near field was executed to verify the validity and accuracy of the analysis. In addition, an underwater vehicle model was analyzed with the developed near-field equation to confirm various parameter effects such as distance and frequency.

scholarly journals Development of Acoustic Target Strength Analysis System for Submarine

2013 ◽  
Vol 3 (3) ◽  
pp. 158-163 ◽  
Author(s):  
Hyun-Wung Kwon ◽  
Suk-Yoon Hong ◽  
Jae-Jin Jeon ◽  
Jee-Hun Song
Keyword(s):  
Target Strength ◽  
Strength Analysis ◽  
Acoustic Target ◽  
Analysis System

Orthogonal spherical wave source boundary point method and its application to acoustic holography

2004 ◽  
Vol 49 (16) ◽  
pp. 1758-1767 ◽  
Author(s):  
Chuanxing Bi ◽  
Xinzhao Chen ◽  
Jian Chen ◽  
Weibing Li
Keyword(s):  
Boundary Point ◽  
Spherical Wave ◽  
Point Method ◽  
Acoustic Holography ◽  
Wave Source ◽  
Boundary Point Method

scholarly journals The study of the acoustic target strength of Chub mackerel in the northwestern Pacific Ocean in situ

Trudy VNIRO ◽  
2021 ◽  
Vol 184 ◽  
pp. 73-86
Author(s):  
M.Yu. Kuznetsov ◽  
◽  
V.I. Polyanichko ◽  
E.V. Syrovatkin ◽  
I.A. Ubarchuk ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Target Strength ◽  
Northwestern Pacific ◽  
Chub Mackerel ◽  
Northwestern Pacific Ocean ◽  
Acoustic Target

First in situ estimates of acoustic target strength of Antarctic toothfish (Dissostichus mawsoni)

2018 ◽  
Vol 206 ◽  
pp. 79-84 ◽  
Author(s):  
Richard L. O’Driscoll ◽  
Simonepietro Canese ◽  
Yoann Ladroit ◽  
Steve J. Parker ◽  
Laura Ghigliotti ◽  
...  
Keyword(s):  
Target Strength ◽  
Antarctic Toothfish ◽  
Dissostichus Mawsoni ◽  
Acoustic Target

scholarly journals Near-Field to Far-Field Transformation on Arbitrary Surfaces via Multi-Level Spherical Wave Expansion

2020 ◽  
Vol 68 (1) ◽  
pp. 500-508 ◽  
Author(s):  
Fernando Rodriguez Varela ◽  
Belen Galocha Iraguen ◽  
Manuel Sierra-Castaner
Keyword(s):  
Near Field ◽  
Spherical Wave ◽  
Far Field ◽  
Wave Expansion ◽  
Field Transformation ◽  
Multi Level ◽  
Spherical Wave Expansion

scholarly journals Acoustic Target Strength of the Endangered Chinese Sturgeon (Acipenser sinensis) by Ex Situ Measurements and Theoretical Calculations

2018 ◽  
Vol 8 (12) ◽  
pp. 2554 ◽  
Author(s):  
Hui Zhang ◽  
Junyi Li ◽  
Chongrui Wang ◽  
Chengyou Wang ◽  
Jinming Wu ◽  
...  
Keyword(s):  
Theoretical Calculations ◽  
Breeding Population ◽  
Ex Situ ◽  
Target Strength ◽  
Effective Management ◽  
Chinese Sturgeon ◽  
Acipenser Sinensis ◽  
Acoustic Target ◽  
The Mean ◽  
Db Difference

The Chinese sturgeon, Acipenser sinensis, is a large anadromous and highly endangered protected species. The assessment of its breeding population in the Yangtze River is critically important for effective management and population preservation. Currently, hydroacoustic methods have been widely used to study the adult sturgeons in the river, whereas the acoustic target strength (TS) characteristics of the species have not been studied. In this study, the TS of Chinese sturgeon was carefully evaluated both by ex situ measurements and theoretical calculations. Six Chinese sturgeons (Body Length (BL): 74.0−92.6 cm) were measured by a 199 kHz split echosounder in a 10-m deep net cage. The computed tomography of a Chinese sturgeon (BL: 110.0 cm) was conducted and the Kirchhoff ray mode (KRM) method was used to estimate the theoretical TS. As a result, the mean ex situ TS range of the six specimens was from −26.9 to −31.4 dB, which was very close to the KRM estimation (~1 dB difference). Then, the KRM method was used to predict the TS of Chinese sturgeon as a function of BL in six frequencies commonly used in freshwater environments and to estimate the TS of a representative adult Chinese sturgeon (250 cm) as a function of frequency and tilt angle. This study can provide a good basis for future hydroacoustic studies on the critically endangered Chinese sturgeon.

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