Uncertainty in acoustic mine detection due to environmental variability
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Authors
Chu, Peter C.
Vares, Nick A.
Keenan, Ruth E.
Subjects
Advisors
Date of Issue
2004-05
Date
2004-05
Publisher
Language
Abstract
Uncertainty in acoustic bottom target detection
due to environmental variability for a shallow sea (30 m
water depth) is investigated using the Navy’s
Comprehensive Acoustic Simulation System/Gaussian Ray
Bundle model for a generic Very High Frequency (VHF)
forward looking sonar. The effects of imprecise bottom
type and wind speed data are evaluated to determine the
impact of this variability on bottom target detection. The
acoustic uncertainty due to the wind variability is more
sensitive to muddy sand than to and sandy silt. Maximum
acoustic uncertainty due to wind variability is 9 dB for the
muddy sand and 6 dB for the sandy silt. For the bottom
target detection, the wind speed accuracy is extremely
important. If wind speed uncertainty exceeds 7 kts, the
bottom target is unlikely to be detected. The signal excess
variability is small and operational benefits may be
maximized with slightly better sonar. Deep transducer
(depth: 25 m) demonstrates substantial signal excesses up
to 23 dB compared to 7 dB for shallow transducer (depth:
5.18 m). Therefore, to increase the probability of bottom
target detection utilizing the generic VHF forward looking
sonar, placement of the transducer deeper in the water
column is recommended.
Type
Conference Proceedings
Description
Journal of Counter-Ordnance Technology (Sixth International Sym um on Technology and Mine Problem, NPS, 10-13 May, 2004)
Series/Report No
Department
Department of Oceanography
Organization
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Chu, P.C., N. Vares, and R. Keenan, 2004: Uncertainty in acoustic mine detection due to environmental variability, Sixth Monterey International Symposium on Technology and Mine Problems, Society for Counter-Ordnance Technology, Monterey, California
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.