Abstract
Sonar performance models use several low-level acoustic models to predict the effect of the environment on reverberation and noise. Many of these acoustic models, particularly those predicting seabed scattering strength, were developed at lower frequencies than those currently used by both the scientific and mine-hunting communities. This paper examines the popular Applied Physics Laboratory of the University of Washington (APL-UW) acoustic backscatter strength model and tests its validity in the extended frequency band of 110–170 kHz. Acoustic and environmental data (gathered as part of a joint program with NATO SACLANTCEN) from several sites are collated and compared in this paper. This provides compelling evidence regarding the validity of the APL-UW backscatter model at these higher frequencies.
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