SIGNAL COHERENCE MODELING FOR SHALLOW WATER WITH ROUGH BOUNDARIES

Authors
  1. Ozard, J.M.
  2. Brooke, G.H.
  3. Wilmut, M.J.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN)
Abstract
A normal mode model is used to predict signal coherence for a sound source moving horizontally in shallow water. In the model, modal amplitude or modal phase are assumed to fluctuate. The fluctuations are ascribed to the effect of the surface or bottom roughness on sound propagation. For frequencies at which only a few modes are important, namely water depths of the order of 1.5 wavelengths, model coherence was calculated for sensor configurations in the plane containing source and receivers. For source motion towards the receivers, it was found that for phase and amplitude fluctuations the coherences obtained are identical and that the coherence, which can drop to zero over a few wavelengths, is independent of the fluctuation distribution width.
Report Number
TM-82-1 —
Date of publication
15 Jan 1982
Number of Pages
33
DSTKIM No
83-00209
CANDIS No
38366
Format(s):
Hardcopy;Originator's fiche received by DSIS

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