NDLI: Measurements and modeling of the target strength of divers

Content Provider	IEEE Xplore Digital Library
Author	Sarangapani, S. Miller, J.H. Potty, G.R. Reeder, D.B. Stanton, T.K. Dezhang Chu
Copyright Year	2005
Description	Author affiliation: Dept. of Ocean Eng., Rhode Island Univ., Narragansett, RI, USA (Sarangapani, S.; Miller, J.H.; Potty, G.R.)
Abstract	Acoustic methods (sonars) offer a potential tool for detecting and tracking of underwater swimmers. The main unknown in assessing the feasibility of using sonar to detect swimmers is their target strength. The target strength of diver with tanks, buoyancy control, wet or dry suit, etc. is a complicated function of aspect angle and frequency. The detection range for a diver will depend strongly on the target strength and very little data are available in the literature on this topic. This dearth of information limits the ability of sonar engineers to design a detection system. Our study addresses this issue both experimentally and theoretically. As part of this study target strength measurements made in the field were compared with theoretical models. Measurements are being conducted using Farsounder FS-3 phased array sonar with a center frequency of 60 kHz. Tests will be carried out in shallow water using a diver at different orientations, depths and ranges. Target strength modeling was performed using simple cylindrical models and more sophisticated techniques. Existing target strength models for finite cylindrical shapes derived by Gaunaurd (1985) were used as initial approximations. A relatively new technique for modeling acoustic scattering by axisymmetric finite-length bodies using a three-dimensional Fourier mapping method developed by Reeder and Stanton (2004) was compared to the data.
Starting Page	952
Ending Page	956
File Size	791370
Page Count	5
File Format	PDF
ISBN	0780391039
DOI	10.1109/OCEANSE.2005.1513185
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-20
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sonar detection Sonar measurements Acoustic signal detection Underwater tracking Frequency Phased arrays Acoustic measurements Underwater acoustics Target tracking Design engineering
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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