The possibility of reconstruction of two-dimensional random inhomogeneities in a shallow sea by frequency shifts of the spatial interference structure of the sound field |
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| Authors: | V M Kuz’kin S A Pereselkov E A Petnikov |
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| Institution: | (1) Wave Research Center, Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991, Russia;(2) Voronezh State University, Universitetskaya pl. 1, Voronezh, 394693, Russia |
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| Abstract: | Fluctuations of frequency shifts of the spatial interference structure of the sound field in the oceanic waveguide, caused
by a two-dimensional field of a random perturbation, are described. Various schemes of observation point spacing are considered.
The possibility is shown to reconstruct the spatial spectrum of waveguide perturbations by measuring the spatial spectrum
of the frequency shift of the interference pattern. The results of the theoretical treatment are illustrated by the examples
of background internal waves and bottom roughness. The sensitivity of monitoring based on measurements of frequency shifts
of the interference structure of the sound field is estimated. For medium perturbations by background internal waves, the
fluctuations of liquid layer vibrations, sound speed, and temperature, which are minimum detectable by frequency shifts of
the interference pattern, were estimated. |
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