Publication:
Design of a synthetic aperture array to support experiments in active control of scattering

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Authors
Dullea, James P.
Subjects
Advisors
Date of Issue
1990
Date
Jun-90
Publisher
Monterey California. Naval Postgraduate School
Language
en_US
Abstract
A synthetic aperture acoustic array is used to as a spatial filter in a reverberant test facility. The array is used to examine the c' rge in the received signal when a fluid loaded steel plate is replaced by the free surface. Twenty millisecond active pulses at 2 kHz were scattered by the target plate and recorded by the synthetic aperture array for post processing. 'I ie method of reverberant field subtraction was utilized and found unsatisfactory for use with signals of 20 msec duration in a reverberant tank. Array processing using a rectangular amplitude function was marginally successful. A Chebyshev amplitude weighted array was successfully used to demonstrate the ability of a linear array to discriminate between the steel plate and free surface scattering. A computer aided interactive design tool was written to aid in the analysis of array architectures by calculating hydrophone amplitude weights, beamwidth, directivity index and graphically presenting the normalized directional beampattern. The program allows comparative analysis of two array designs simultaneously.
Type
Thesis
Description
CIVINS (Civilian Institutions) Thesis document
Department
Mechanical Engineering
Identifiers
NPS Report Number
Sponsors
Funder
U.S. Naval Postgraduate School, CIVINS program
Format
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.
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