Development of Mid-Frequency Multibeam Sonar for Fisheries Applications

2006 ◽  
Author(s):  
John K. Horne ◽  
Christopher D. Jones ◽  
Mike A. Wolfson
Keyword(s):  
Multibeam Sonar

scholarly journals Smart Ocean: A New Fast Deconvolved Beamforming Algorithm for Multibeam Sonar

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 4013 ◽  
Author(s):  
Jie Huang ◽  
Tian Zhou ◽  
Weidong Du ◽  
Jiajun Shen ◽  
Wanyuan Zhang
Keyword(s):  
High Frequency ◽  
Real Data ◽  
Side Lobe ◽  
Tunnel Effect ◽  
Computation Complexity ◽  
Acoustic Image ◽  
Multibeam Sonar ◽  
Sonar System ◽  
Topographic Survey ◽  
Beamforming Algorithm

A new fast deconvolved beamforming algorithm is proposed in this paper, and it can greatly reduce the computation complexity of the original Richardson–Lucy (R–L algorithm) deconvolution algorithm by utilizing the convolution theorem and the fast Fourier transform technique. This algorithm makes it possible for real-time high-resolution beamforming in a multibeam sonar system. This paper applies the new fast deconvolved beamforming algorithm to a high-frequency multibeam sonar system to obtain a high bearing resolution and low side lobe. In the sounding mode, it restrains the tunnel effect and makes the topographic survey more accurate. In the 2D acoustic image mode, it can obtain clear images, more details, and can better distinguish two close targets. Detailed implementation methods of the fast deconvolved beamforming are given, its computational complexity is analyzed, and its performance is evaluated with simulated and real data.

scholarly journals Observations of Shallow Methane Bubble Emissions From Cascadia Margin

2021 ◽  
Vol 9 ◽  
Author(s):  
Anna P. M. Michel ◽  
Victoria L. Preston ◽  
Kristen E. Fauria ◽  
David P. Nicholson
Keyword(s):  
Water Column ◽  
Water Depth ◽  
Dissolved Methane ◽  
Multibeam Sonar ◽  
Surface Ocean ◽  
Transient Nature ◽  
Technological Approach ◽  
Open Questions ◽  
Cascadia Margin ◽  
Methane Bubble

Open questions exist about whether methane emitted from active seafloor seeps reaches the surface ocean to be subsequently ventilated to the atmosphere. Water depth variability, coupled with the transient nature of methane bubble plumes, adds complexity to examining these questions. Little data exist which trace methane transport from release at a seep into the water column. Here, we demonstrate a coupled technological approach for examining methane transport, combining multibeam sonar, a field-portable laser-based spectrometer, and the ChemYak, a robotic surface kayak, at two shallow (<75 m depth) seep sites on the Cascadia Margin. We demonstrate the presence of elevated methane (above the methane equilibration concentration with the atmosphere) throughout the water column. We observe areas of elevated dissolved methane at the surface, suggesting that at these shallow seep sites, methane is reaching the air-sea interface and is being emitted to the atmosphere.

scholarly journals Comparison of model types for prediction of seafloor trawlability in the Gulf of Alaska by using multibeam sonar data

2021 ◽  
Vol 119 (2-3) ◽  
pp. 184-196
Author(s):  
Sarah C. Stienessen ◽  
Christopher N. Rooper ◽  
Thomas C. Webe ◽  
Darin T. Jones ◽  
Jodi L. Pirtle ◽  
...  
Keyword(s):  
Gulf Of Alaska ◽  
Multibeam Sonar

Measurement of Nearshore Seabed Bathymetry Using Airborne/Mobile LiDAR and Multibeam Sonar at Hujeong Beach, Korea

2020 ◽  
Vol 95 (sp1) ◽  
pp. 1067
Author(s):  
Jong Dae Do ◽  
Jae-Youll Jin ◽  
Chang Hwan Kim ◽  
Won-Hyuck Kim ◽  
Byung-Gil Lee ◽  
...  
Keyword(s):  
Multibeam Sonar ◽  
Seabed Bathymetry

Multibeam Sonar Technology and Geology to Interpret Ancient Harbor Subsidence off Crotone Peninsula, Italy

2011 ◽  
pp. 127-141
Author(s):  
Jean-Daniel Stanley ◽  
Graham A. J. Nickerson ◽  
Maria Pia Bernasconi ◽  
Stephanie Fischer ◽  
Natalie McClure ◽  
...  
Keyword(s):  
Multibeam Sonar
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