APPLICATION OF TIME REVERSAL TO PASSIVE ACOUSTIC CHARACTERIZATION OF THE OCEAN
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Authors
Mcmullin, Ryan M.
Subjects
acoustics
interferometry
geoacoustics
seabed acoustics
time reversal mirror
parabolic equation model
passive noise interferometry
interferometry
geoacoustics
seabed acoustics
time reversal mirror
parabolic equation model
passive noise interferometry
Advisors
Godin, Oleg A.
Date of Issue
2019-12
Date
Dec-19
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
Acoustic remote sensing has long been useful to the oil and gas industry for determining where to drill, and to the Navy in determining ocean bottom properties for sonar performance prediction. Traditionally, geoacoustic measurements are taken using a controlled sound source and receiver—an expensive process in terms of time and capital. Noise interferometry, however, utilizes passive acoustic signatures from ambient and shipping noise collected over longtime scales to measure the acoustic Green’s function, allowing each hydrophone used to act as a virtual transceiver. Passive interferometry is inexpensive and allows for inconspicuous monitoring of ocean and seafloor properties relative to active sources. Armed with knowledge of virtual transceivers and acoustic reciprocity, the deduction of seabed properties, acoustic and otherwise, without the need for an active source is possible through use of the single element passive time reversal mirror. Using data from the Shallow Water 2006 experiment, this thesis investigates the capability and accuracy of deducing seafloor acoustic properties from noise cross-correlation functions of diffuse noise in a shallow water waveguide using a time reversal mirror technique.
Type
Thesis
Description
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NPS Report Number
Sponsors
National Science Foundation
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Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.