Shallow-Water Acoustic Communications Channel Modeling Using Three-Dimensional Gaussian Beams

Recent progress in the development of a physics-based numerical propagation model for the virtual transmission of acoustic communication signals in shallow water is presented. The ultimate objective is to provide for the prediction of the output of the quadrature detector (QD, an analog of the discrete Fourier transform) in a time-variant, doubly dispersive, shallow-water channel. Current model development concentrates on the modeling of the QD response in the presence of rough boundaries, reserving inclusion of effects caused by a time-varying sea surface or source/receiver motion to future implementations. Three-dimensional Gaussian beam tracing is used so that outof-plane reflections from rough surfaces or sloping bathymetry can be adequately modeled. Model predictions of the impulse response for a real shallow-water environment are observed to agree well with measured impulse responses. Shallow-Water Acoustic Communications Channel Modeling Using Three-Dimensional Gaussian Beams Paul A. Baxley, Homer Bucker, Vincent K. McDonald, and Joseph A. Rice

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