Low‐frequency attenuation and sound‐speed measurements in marine sediments using an impulsive source.

2010 ◽  
Vol 127 (3) ◽  
pp. 1937-1937 ◽  
Author(s):  
Altan Turgut ◽  
Jeff Schindall ◽  
Steven Means
Keyword(s):  
Marine Sediments ◽  
Sound Speed ◽  
Low Frequency ◽  
Impulsive Source

scholarly journals Depth Discrimination for Low-Frequency Sources Using a Horizontal Line Array of Acoustic Vector Sensors Based on Mode Extraction

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3692 ◽  
Author(s):  
Guolong Liang ◽  
Yifeng Zhang ◽  
Guangpu Zhang ◽  
Jia Feng ◽  
Ce Zheng
Keyword(s):  
Sound Speed ◽  
Linear Equations ◽  
Robustness Analysis ◽  
Low Frequency ◽  
Horizontal Line ◽  
Testing Hypotheses ◽  
Depth Discrimination ◽  
Line Array ◽  
Vector Sensors ◽  
Mode Extraction

Depth discrimination is a key procedure in acoustic detection or target classification for low-frequency underwater sources. Conventional depth-discrimination methods use a vertical line array, which has disadvantage of poor mobility due to the size of the sensor array. In this paper, we propose a depth-discrimination method for low-frequency sources using a horizontal line array (HLA) of acoustic vector sensors based on mode extraction. First, we establish linear equations related to the modal amplitudes based on modal beamforming in the vector mode space. Second, we solve the linear equations by introducing the total least square algorithm and estimate modal amplitudes. Third, we select the power percentage of the low-order modes as the decision metric and construct testing hypotheses based on the modal amplitude estimation. Compared with a scalar sensor, a vector sensor improves the depth discrimination, because the mode weights are more appropriate for doing so. The presented linear equations and the solution algorithm allow the method to maintain good performance even using a relatively short HLA. The constructed testing hypotheses are highly robust against mismatched environments. Note that the method is not appropriate for the winter typical sound speed waveguide, because the characteristics of the modes differ from those in downward-refracting sound speed waveguide. Robustness analysis and simulation results validate the effectiveness of the proposed method.

Frequency dependence of sound speed and attenuation in marine sediments

2006 ◽  
Vol 120 (5) ◽  
pp. 3099-3099
Author(s):  
William M. Carey ◽  
Ji‐Xun Zhou ◽  
Allan D. Pierce
Keyword(s):  
Frequency Dependence ◽  
Marine Sediments ◽  
Sound Speed

Shipboard low frequency sound speed measurements in the New England Mud Patch

2016 ◽  
Vol 139 (4) ◽  
pp. 2111-2111
Author(s):  
Gabriel R. Venegas ◽  
Preston S. Wilson ◽  
Kevin M. Lee ◽  
Megan S. Ballard ◽  
Allen H. Reed ◽  
...  
Keyword(s):  
New England ◽  
Sound Speed ◽  
Low Frequency ◽  
Frequency Sound

Finite element modeling of the low-frequency sound speed of seagrass leaves

2020 ◽  
Vol 148 (4) ◽  
pp. 2482-2483
Author(s):  
Nicholas A. Torres ◽  
Megan S. Ballard ◽  
Kevin M. Lee ◽  
Gabriel R. Venegas ◽  
Preston S. Wilson
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Sound Speed ◽  
Low Frequency ◽  
Frequency Sound ◽  
Element Modeling

Estimates of Low-Frequency Sound Speed and Attenuation in a Surface Mud Layer Using Low-Order Modes

2020 ◽  
Vol 45 (1) ◽  
pp. 201-211
Author(s):  
Lin Wan ◽  
Mohsen Badiey ◽  
David P. Knobles ◽  
Preston S. Wilson ◽  
John A. Goff
Keyword(s):  
Sound Speed ◽  
Low Frequency ◽  
Frequency Sound ◽  
Low Order

scholarly journals Modelling acoustic scattering, sound speed, and attenuation in gassy soft marine sediments

2016 ◽  
Vol 140 (1) ◽  
pp. 274-282 ◽  
Author(s):  
A. Mantouka ◽  
H. Dogan ◽  
P. R. White ◽  
T. G. Leighton
Keyword(s):  
Marine Sediments ◽  
Sound Speed ◽  
Acoustic Scattering

Shipboard low frequency sound speed measurements in the New England Mud Patch (NEMP)

2016 ◽  
Author(s):  
Gabriel R. Venegas ◽  
Preston S. Wilson ◽  
Kevin M. Lee ◽  
Megan S. Ballard ◽  
Allen H. Reed ◽  
...  
Keyword(s):  
New England ◽  
Sound Speed ◽  
Low Frequency ◽  
Frequency Sound
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