Single hydrophone technique for obtaining spectral source levels of marine mammals in coastal waters
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Authors
Bostian, R.
Medwin, H.
Subjects
Advisors
Date of Issue
1977
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
During the annual Gray Whale migration from the Aleutians to Baja California, the mammals travel in coastal waters, thereby presenting an opportunity for the study of their sound spectral and source levels and vocabulary. However, such measurements are distorted by surface and bottom reverberation. Using the theory of rough surface scattering, knowledge of the bottom impedance, and correlation techniques, it is possible to decompose the shallow water reverberation into the contributions from different paths. From this, the range, depth and the deverberated spectral source levels of the sounds of the mammal can be determined by use of only one hydrophone rather than the conventional three or four. The theory, deverberation programming, and experimental results are presented for a model of the whale's pulsed radiation in a laboratory model coastal environment
Type
Abstract
Description
Series/Report No
Department
Physics
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Office of Naval Research (ONR)
Funder
Format
2 p.
Citation
Bostian, Richard Massey. Single Hydrophone Technique for Obtaining Spectral Source Levels of Marine Mammals in Coastal Waters. NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF, 1977.
Distribution Statement
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.