The hydrographic doppler sonar system on the roger revelle

2004 ◽  
Author(s):  
R. Pinkel ◽  
L. Rainville ◽  
E. Slater ◽  
M. Goldin ◽  
L. Green ◽  
...  
Keyword(s):  
Sonar System ◽  
Doppler Sonar

scholarly journals SwathDop: Multibeam Pulse-Coherent Doppler Sonar for Scanning 2D Velocity Sections near the Sediment–Water Interface

2019 ◽  
Vol 36 (11) ◽  
pp. 2153-2169
Author(s):  
Mahdi Razaz ◽  
Len Zedel ◽  
Alex E. Hay
Keyword(s):  
Sediment Transport ◽  
Software Defined Radio ◽  
Wide Band ◽  
Preliminary Test ◽  
Unidirectional Flow ◽  
Sonar System ◽  
Median Diameter ◽  
Independent Observations ◽  
Signal Processing Algorithms ◽  
Doppler Sonar

AbstractThis paper considers the problem of accurately measuring the sediment transport over bedforms where flow evolves continuously both in time and space. For this purpose, we have developed a pulse-to-pulse coherent Doppler sonar system designed in bistatic geometry with two fan-beam transmitters symmetrically positioned on each side of a multielement receive array. The system resolves 2D velocity components within a ±20° (~0.5 m by ~0.5 m) swath. The software-defined radio data acquisition and control system limited us at present to eight independent receiver channels, and consequently the azimuthal resolution of the system is 4°. As a preliminary test of the sonar system, the system operation was simulated using a model developed to predict coherent sonar performance. The uncertainties with respect to the prescribed values and mean measurements in the model results were confined to 0.35 and 0.23 cm s−1, respectively, in the presence of strong shear (~150 s−1) and 50 cm s−1 horizontal flow. An important thing is that the model allowed us to test and develop the signal processing algorithms necessary to invert the multibeam sonar data. Using sand of 0.4-mm median diameter, the laboratory trials were carried out in active sediment transport conditions over dunes with 2-m wavelength and ~0.90 m s−1 unidirectional flow velocities. The results presented here focus mainly on 2D velocity field and indicate an average 4% deviation from the wake law and 8% from independent observations made with the wide-band multifrequency coherent Doppler profiler (MFDop) instrument under similar flow conditions.

Field trial of a Doppler sonar system for fisheries applications

2003 ◽  
Vol 114 (4) ◽  
pp. 2375-2375
Author(s):  
Cristina D. S. Tollefsen ◽  
Len Zedel
Keyword(s):  
Field Trial ◽  
Sonar System ◽  
Doppler Sonar

Doppler Sonar System

1964 ◽  
Vol BME-11 (1 & 2) ◽  
pp. 53-53
Author(s):  
R. Stuart MacKay
Keyword(s):  
Sonar System ◽  
Doppler Sonar

scholarly journals Bio-Inspired Human Action Recognition With a Micro-Doppler Sonar System

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 28388-28403 ◽  
Author(s):  
Thomas S. Murray ◽  
Daniel R. Mendat ◽  
Kayode A. Sanni ◽  
Philippe O. Pouliquen ◽  
Andreas G. Andreou
Keyword(s):  
Action Recognition ◽  
Human Action Recognition ◽  
Human Action ◽  
Sonar System ◽  
Doppler Sonar

scholarly journals Evaluation of a Doppler sonar system for fisheries applications

2003 ◽  
Vol 60 (3) ◽  
pp. 692-699 ◽  
Author(s):  
Cristina D.S Tollefsen ◽  
Len Zedel
Keyword(s):  
Pacific Salmon ◽  
Field Trials ◽  
General Purpose ◽  
Fish Swimming ◽  
Sonar System ◽  
The Pacific ◽  
Sonar Systems ◽  
Doppler Sonar ◽  
Theoretical Accuracy

Abstract We report on tests of a general-purpose, coherent, Doppler sonar system undertaken to explore its capabilities when applied to detecting discrete fish targets. This 250-kHz, 30 kHz bandwidth instrument provides for phase coding of the transmit pulses and coherent sampling of successive acoustic returns. Towtank tests were used to determine the basic operating capabilities of the system. Under these ideal conditions a single-ping velocity accuracy of between 3 and 8 cm s−1 can be achieved approaching the theoretical limit for this instrument. Field trials were undertaken on the Fraser River in British Columbia near the Pacific Salmon Commission's field site, allowing comparisons with conventional fisheries sonar systems. While the long-term goal is to apply the Doppler sonar system in a larger-scale marine environment, the passage of migrating salmon provides an ideal test opportunity with fish of predictable and well defined swimming behaviour. Individual fish-swimming speed can be measured with an accuracy of between 5 and 10 cm s−1. By comparison, water velocity measurements made with the same instrument can only achieve a theoretical accuracy of 60 cm s−1.

Embedded Air-Coupled Ultrasonic 3D Sonar System with GPU Acceleration

2020 ◽  
Author(s):  
Gianni Allevato ◽  
Matthias Rutsch ◽  
Jan Hinrichs ◽  
Marius Pesavento ◽  
Mario Kupnik
Keyword(s):  
Gpu Acceleration ◽  
Sonar System

Phased array Doppler sonar transducer

1987 ◽  
Vol 82 (4) ◽  
pp. 1469-1469
Author(s):  
Robert L. Simmons ◽  
Clifton M. Wyant
Keyword(s):  
Phased Array ◽  
Doppler Sonar
Sign in / Sign up

Export Citation Format

Share Document