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Estimation of bottom backscattering strength from measured and modeled AN/SQS-53C reverberation levels

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Author
Scanlon, Gary Alexander.
Date
1995-06
Advisor
Wilson, James H.
Bourke, Robert H.
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Abstract
Hamilton type geoacoustic models were developed for Area Foxtrot, a NUWC test bed for emerging active sonar systems where the surface sediment type is highly spatially variable. Reverberation levels (RL) were modeled using the FEPE propagation model to augment the GSM propagation model because the bottom loss model in GSM did not estimate transmission loss accurately in shallow water. FEPE estimates reveal there is over a 15 dB difference between TL for sand and silt-clay sediments in Area Foxtrot. The comparison between modeled RL and measured RL (from a 1991 ASW exercise conducted by MUWC) enabled bottom scattering strength kernels to be developed for Area Foxtrot Bottom scattering strength was found to be a function of sediment type. Hard sand sediment has a bottom scattering strength which obeys Lambert's law (sin2 (theta)) while that of silt clay sediment is consistent with volume scattering (sin (theta)). The RLs in Area Foxtrot are azimuth-dependent and are a function of TL and bottom scattering strength (and hence bottom sediment type). Sonar beams steered towards the hard sand show higher.
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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.
URI
http://hdl.handle.net/10945/7521
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