Sub-bottom high resolution sonar utilizing non-linear acoustic pulse self-demodulation
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Authors
Eyman, Roy Lance
LeStrange, Peter John
Seemann, Axel Harry
Subjects
parametric end-fire array
sediment penetration
target localization
resolution and classification
line-in-cone
shock excitation
independent propagation
sediment penetration
target localization
resolution and classification
line-in-cone
shock excitation
independent propagation
Advisors
Sackman, G. L.
Date of Issue
1982-12
Date
December 1982
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
An experiment involving the design and construction of a prototype sub-bottom high resolution sonar system utilizing nonlinear pulse self- demodulation and suitable for deep water use is described. It is possible to generate a low frequency wave using the self-demodulation of a short, high frequency, finite amplitude pulse produced by the non-linear properties of the medium. The generated low frequency wave will theoretically have the high directivity of the primary wave while simultaneously possessing the bottom penetrating characteristics of the lower frequency. Measurements demonstrate that the pulse self-demodulation occurs as theoretically predicted, and the results are successfully applied to the design of the sonar system. Shallow water tests demonstrating the potential effectiveness of the sonar system for detection and classification of target objects in bottom sediments are also described.
Type
Thesis
Description
Series/Report No
Department
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
147 p.
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.