ECE Master of Science Thesis Defense By: Nicholas J. Vincelette
When: Wednesday,
August 21, 2019
2:00 PM
-
4:00 PM
Where: Science & Engineering Building, Lester W. Cory Conference Room: Room 213A
Cost: Free
Description: Topic: Doppler Properties of Acoustic Scattering from Ocean-Like Surfaces
Location: Lester W. Cory Conference Room, Science & Engineering Building (SENG), Room 213A
Abstract:
In SONAR systems and underwater acoustic communications, acoustic signals that propagate in the ocean are scattered in different directions, when they encounter the air-water interface. Since the ocean surface is a dynamic boundary, the scattering process is time dependent and will result in the signal spectrum experiencing Doppler broadening. The focus of this research is on the scattering of longitudinal waves from ocean-like surfaces. Since the air-water interface is a soft boundary, the scattering of transverse waves, also known as shear waves, may be ignored. For the purpose of clarity, this study will focus on one-dimensional ocean-like surfaces. The study will investigate the effect of long surfaces waves (>> acoustic wavelength) on acoustic scattering. The study will also investigate the impact of acoustic wave frequency on the scattering process. By modeling the scattering from dynamic ocean-like surfaces that have varying harmonics and time-dependent phase, one is able to investigate the Doppler properties of the scattered signal, which is critical in many sonar and acoustic communication applications. Coherence times of the scattered signals, which is used as a measure of Doppler broadening, are estimated for different ocean surface conditions. The project’s ultimate goal is to incorporate these factors in a rigorous study of the Doppler spectral properties of the scattered waves.
NOTE: All ECE Graduate Students are ENCOURAGED to attend.
All interested parties are invited to attend. Open to the public.
Advisor: Dr. Dayalan P. Kasilingam
Committee Members: Dr. David A. Brown and Dr. Paul J. Gendron, Department of Electrical & Computer Engineering, UMASS Dartmouth and Dr. Raymond N. Laoulache, College of Engineering, UMASS Dartmouth
*For further information, please contact Dr. Dayalan P. Kasilingam at 508.999.8534, or via email at dkasilingam@umassd.edu.
Location: Lester W. Cory Conference Room, Science & Engineering Building (SENG), Room 213A
Abstract:
In SONAR systems and underwater acoustic communications, acoustic signals that propagate in the ocean are scattered in different directions, when they encounter the air-water interface. Since the ocean surface is a dynamic boundary, the scattering process is time dependent and will result in the signal spectrum experiencing Doppler broadening. The focus of this research is on the scattering of longitudinal waves from ocean-like surfaces. Since the air-water interface is a soft boundary, the scattering of transverse waves, also known as shear waves, may be ignored. For the purpose of clarity, this study will focus on one-dimensional ocean-like surfaces. The study will investigate the effect of long surfaces waves (>> acoustic wavelength) on acoustic scattering. The study will also investigate the impact of acoustic wave frequency on the scattering process. By modeling the scattering from dynamic ocean-like surfaces that have varying harmonics and time-dependent phase, one is able to investigate the Doppler properties of the scattered signal, which is critical in many sonar and acoustic communication applications. Coherence times of the scattered signals, which is used as a measure of Doppler broadening, are estimated for different ocean surface conditions. The project’s ultimate goal is to incorporate these factors in a rigorous study of the Doppler spectral properties of the scattered waves.
NOTE: All ECE Graduate Students are ENCOURAGED to attend.
All interested parties are invited to attend. Open to the public.
Advisor: Dr. Dayalan P. Kasilingam
Committee Members: Dr. David A. Brown and Dr. Paul J. Gendron, Department of Electrical & Computer Engineering, UMASS Dartmouth and Dr. Raymond N. Laoulache, College of Engineering, UMASS Dartmouth
*For further information, please contact Dr. Dayalan P. Kasilingam at 508.999.8534, or via email at dkasilingam@umassd.edu.
Contact:
ECE: Electrical & Computer Engineering Department 508.999.9164 http://www.umassd.edu/engineering/ece/
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