Uncertainty in acoustic mine detection due to environmental variability

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Author
Chu, Peter C.
Vares, Nick A.
Keenan, Ruth E.
Date
2004-05Metadata
Show full item recordAbstract
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.
Description
Journal of Counter-Ordnance Technology (Sixth International Sym um on Technology and Mine Problem, NPS, 10-13 May, 2004)
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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.Collections
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