Side scan sonar target detection in the presence of bottom backscatter

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Authors
Kenny, Maureen R.
Mix, Jeffrey D.
Subjects
Backscatter
Target detection
Target spheres
Sonar equation
Target strength
Underwater acoustics
Detection range
Side scan sonar
Advisors
Hart, William E.
Sanders, James V.
Date of Issue
1983-09
Date
September 1983
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The effect of bottom backscatter on target detection ranges for 100-kHz Klein and EG&G side scan sonars was investigated. Glass spheres of 16-cm diameter with measured target strengths of -24 dB were deployed in 30-m water depth, 0.7 m above sand and shale bottoms. Controlled test runs past a linear target configuration were performed. For a sand bottom, the Klein system yielded target detections at a maximum range of 150 m with 100% success. The EG&G system yielded 100% detection out to 152-m range, with detection 46% of the time at 259 m and 865% at 228 m. A shale bottom masked all target returns negating detection. Detection thresholds were estimated by comparing field results to theoretical ranges calculated from the sonar equation using applicable backscatter coefficients. The results show that is possible to determine the geophysical and side scan system inputs sufficiently well to allow determination of the efficient spacing of survey lines in shallow water hydrographic applications of side scan sonar.
Type
Thesis
Description
Series/Report No
Department
Oceanography
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
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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