Link to the University of Pittsburgh Homepage
Link to the University Library System Homepage Link to the Contact Us Form

Implementation and Application of dispersion-based waveguide models for shallow-water sonar processing

Aluko, Obadamilola (2004) Implementation and Application of dispersion-based waveguide models for shallow-water sonar processing. Master's Thesis, University of Pittsburgh. (Unpublished)

Primary Text

Download (1MB) | Preview


In wave propagation, the phenomenon of dispersion, whereby different frequencies travel at different velocities, can result in significant nonstationarities, i.e., time- and spatially-varying characteristics of the wave. This effect is particularly strong in shallow water sound propagation, due to the waveguide-like action of the ocean bottom and surface.These channel-induced nonstationarities can have a deleterious impact on automatic detection and classification in the absence of signal processing techniques that account for dispersive channel effects.We quantify the effects of dispersion on the spatial and temporal spreading of a propagating wave by considering local temporal, spatial and spectral moments of the modes of the wave. By local moments we mean, for example, the spread (standard deviation) of the wave in time at a particular location; or the average frequency of the wave at a particular time. We implement simple dispersion-based waveguide models of a shallow ocean channel and demonstrate by application to impulsive-source sonar data thatsimple channel models requiring little environmental information can be used to compensate for the effects of dispersion.


Social Networking:
Share |


Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairLoughlin,
Committee MemberEl-Jaroudi, Amro Aamro@ee.pitt.eduAMRO
Committee MemberChaparro, Luis Fchaparro@ee.pitt.eduLFCH
Date: 9 June 2004
Date Type: Completion
Defense Date: 4 December 2003
Approval Date: 9 June 2004
Submission Date: 13 April 2004
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Electrical Engineering
Degree: MSEE - Master of Science in Electrical Engineering
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: 2-plate wavegude; group velocity; ocean acoustics; pekeris waveguide; sound in water; waveguide; dispersion; FIR filter
Other ID:, etd-04132004-132153
Date Deposited: 10 Nov 2011 19:36
Last Modified: 15 Nov 2016 13:39


Monthly Views for the past 3 years

Plum Analytics

Actions (login required)

View Item View Item