Sliced phased array doppler sonar system

1999 ◽  
Vol 105 (1) ◽  
pp. 19
Author(s):  
F. A. Crandall
Keyword(s):  
Phased Array ◽  
Sonar System ◽  
Doppler Sonar

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

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

Data Processing and Error Analysis of Phased-Array Doppler Sonar Velocity System

2011 ◽  
Vol 204-210 ◽  
pp. 1423-1426
Author(s):  
Kai Zhang ◽  
Kun Shang
Keyword(s):  
Error Analysis ◽  
Data Processing ◽  
Phased Array ◽  
Measurement Precision ◽  
Dominant Factor ◽  
Positioning Accuracy ◽  
Positioning Errors ◽  
Doppler Sonar ◽  
Basic Test

The basic test of the phased-array Doppler sonar velocity system made by us indicates that the positioning errors are large. From the positioning result, it can be known that compass error is the dominant factor. Therefore, to improve the measurement precision of compass and revise its course deviation is one of the keys to improve the accuracy of Doppler positioning. From the speed processing result, it shows that the positioning accuracy can be further improved through averaging the speed (smoothing).

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