High‐resolution target strength measurements in deep water

1999 ◽  
Vol 105 (2) ◽  
pp. 1049-1049 ◽  
Author(s):  
Egil Ona ◽  
Ingvald Svellingen
Keyword(s):  
High Resolution ◽  
Deep Water ◽  
Target Strength

High-resolution Optical Imaging for Deep-water Archaeology

2021 ◽  
pp. 30-40
Author(s):  
Hanumant Singh ◽  
Christopher Roman ◽  
Oscar Pizarro ◽  
Brendan Foley ◽  
Ryan Eustic ◽  
...  
Keyword(s):  
High Resolution ◽  
Optical Imaging ◽  
Deep Water

Static connectivity of stacked deep-water channel elements constrained by high-resolution digital outcrop models

AAPG Bulletin ◽  
2019 ◽  
Vol 103 (12) ◽  
pp. 2943-2973 ◽  
Author(s):  
Allie Jackson ◽  
Lisa Stright ◽  
Stephen M. Hubbard ◽  
Brian W. Romans
Keyword(s):  
High Resolution ◽  
Deep Water ◽  
Water Channel ◽  
Static Connectivity ◽  
Digital Outcrop

scholarly journals New broadband methods for resonance classification and high-resolution imagery of fish with swimbladders using a modified commercial broadband echosounder

2010 ◽  
Vol 67 (2) ◽  
pp. 365-378 ◽  
Author(s):  
Timothy K. Stanton ◽  
Dezhang Chu ◽  
J. Michael Jech ◽  
James D. Irish
Keyword(s):  
High Resolution ◽  
Pulse Compression ◽  
Target Strength ◽  
Compression Technique ◽  
Range Resolution ◽  
High Resolution Imagery ◽  
Broadband Signal ◽  
Scattering Strength ◽  
Broadband Signal Processing ◽  
Lower Frequencies

Abstract Stanton, T. K., Chu, D., Jech, J. M., and Irish, J. D. 2010. New broadband methods for resonance classification and high-resolution imagery of fish with swimbladders using a modified commercial broadband echosounder. – ICES Journal of Marine Science, 67: 365–378. A commercial acoustic system, originally designed for seafloor applications, has been adapted for studying fish with swimbladders. The towed system contains broadband acoustic channels collectively spanning the frequency range 1.7–100 kHz, with some gaps. Using a pulse-compression technique, the range resolution of the echoes is ∼20 and 3 cm in the lower and upper ranges of the frequencies, respectively, allowing high-resolution imaging of patches and resolving fish near the seafloor. Measuring the swimbladder resonance at the lower frequencies eliminates major ambiguities normally associated with the interpretation of fish echo data: (i) the resonance frequency can be used to estimate the volume of the swimbladder (inferring the size of fish), and (ii) signals at the lower frequencies do not depend strongly on the orientation of the fish. At-sea studies of Atlantic herring demonstrate the potential for routine measurements of fish size and density, with significant improvements in accuracy over traditional high-frequency narrowband echosounders. The system also detected patches of scatterers, presumably zooplankton, at the higher frequencies. New techniques for quantitative use of broadband systems are presented, including broadband calibration and relating target strength and volume-scattering strength to quantities associated with broadband signal processing.

A double-difference method for high-resolution acoustic tracking using a deep-water vertical array

2017 ◽  
Vol 142 (6) ◽  
pp. 3474-3485
Author(s):  
Ludovic Tenorio-Hallé ◽  
Aaron M. Thode ◽  
Jit Sarkar ◽  
Christopher Verlinden ◽  
Jeffrey Tippmann ◽  
...  
Keyword(s):  
High Resolution ◽  
Deep Water ◽  
Difference Method ◽  
Double Difference ◽  
Vertical Array ◽  
Acoustic Tracking

Target strength of an oily deep-water fish, orange roughy (Hoplostethus atlanticus) I. Experiments

1999 ◽  
Vol 106 (1) ◽  
pp. 131-142 ◽  
Author(s):  
Sam McClatchie ◽  
Gavin Macaulay ◽  
Roger F. Coombs ◽  
Paul Grimes ◽  
Alan Hart
Keyword(s):  
Deep Water ◽  
Target Strength ◽  
Orange Roughy ◽  
Water Fish ◽  
Hoplostethus Atlanticus
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