### ASA 128th Meeting - Austin, Texas - 1994 Nov 28 .. Dec 02

## 4aUW8. A generalized framework for high-frequency optimum target detection
in a shallow water, random wave scattering environment.

**V. Premus
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D. Alexandrou
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L. W. Nolte
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*Dept. of Elec. Eng., Duke Univ., Durham, NC 27708-0291
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It has been shown that for the case of Gaussian reverberation, the
likelihood ratio detector can be made robust with respect to inexact knowledge
of the acoustic scattering medium by incorporating a probabilistic description
of environmental uncertainty and a model for the wave-number spectrum of the
bottom-interacting acoustic field [Premus et al., J. Acoust. Soc. Am.
(submitted)]. In this work a generalized form of the optimum detector is
presented which requires full-field (amplitude and phase) modeling capability
for the scattered field and relies on Monte Carlo integration to treat
environmental uncertainty. The performance of the generalized detector
formulation is compared to that of the original detector formulation, which is
a special case based on explicit modeling of the reverberation second-order
statistics that is exact for the case of Gaussian reverberation. Tradeoffs
involving the prior knowledge, modeling assumptions and computational
requirements are discussed. [Work supported by ONR, Ocean Acoustics.]