CHARACTERIZATION OF HARBOR ENVIRONMENTS USING PASSIVE ACOUSTIC MEANS

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23Jun_Baguley_Lauren.pdf (3.64 MB)
Authors
Baguley, Lauren T.
Subjects
passive acoustics
remote sensing
littoral
harbor
autonomous systems
acoustics
Advisors
Leary, Paul
Olson, Derek
Date of Issue
2023-06
Date
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Monterey, CA; Naval Postgraduate School
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Abstract
The use of active sonar to map shallow water environments is a common practice; however, it is not always practical or possible to use. Active sonar is not covert, and it exposes marine life to high intensity sound. The use of passive sonar to characterize subsurface harbor environments allows for increased maritime domain awareness with a smaller acoustic signature, favorable for environmentally sensitive and restricted environments. Previously, passive sonar has been successfully used to gain information about the subsurface environment. Successful studies determining bottom composition and sediment layering have been conducted, providing a quantifiable metric of the similarities between post-processed passive and active sonar data, demonstrating the utility of collecting and processing ambient noise within the water column. This study explores the feasibility of expanding the use of passive sonar methods to determine geometric information in harbor environments, characterized by multiple vertical boundaries. Using a three-dimensional ray acoustic model coupled with field work in Santa Cruz Harbor, the paths available for acoustic arrays were explored to determine the amount of information that can be gathered passively in this type of environment.
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Thesis
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https://hdl.handle.net/10945/72109
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Oceanography (OC)
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Approved for public release. Distribution is unlimited.
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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.
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