NDLI: A Study of Active Sonar Reverberation using Ultrasonic Experiments in a Shallow-water Tank

Content Provider	IEEE Xplore Digital Library
Author	Rogers, J.S. Krolik, J.L.
Copyright Year	2007
Description	Author affiliation: Duke Univ., Durham (Rogers, J.S.; Krolik, J.L.)
Abstract	This paper describes a study of active sonar reverberation level (RL) estimates made using scaled ultrasonic water-tank data. Such laboratory experiments provide a means of upper bounding the performance of RL estimates made in real shallow-water ocean environments. An ocean-to-tank scaling factor of 1000:1 was used to model a 180-220 Hz active source in a 100 m. deep, 2 km. extent of ocean using a 180-220 kHz. ultrasonic source in a 2 m. diameter tank filled to 0.1 m depth. Time-frequency analysis of backscattered ultrasonic data yielded intensity striations which compare favorably with theoretical models. Reverberation level (RL) estimates were computed as a function of frequency and range for both conventional frequency-invariant processing and more recently proposed waveguide-invariant processing. Experimental results indicate that waveguide invariant RL estimates provides an average 8 dB mean-square-error improvement over conventional methods.
Starting Page	1
Ending Page	5
File Size	3987493
Page Count	5
File Format	PDF
ISBN	9781424406340
DOI	10.1109/OCEANSE.2007.4302358
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-18
Publisher Place	UK
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sonar Reverberation Frequency estimation Acoustic waveguides Acoustic scattering Oceans Time frequency analysis Acoustic propagation Backscatter Fourier transforms time-frequency analysis Active sonar reverberation waveguide invariant
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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