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Study of the Distribution of Reverberation over Doppler Frequencies in a Deep-Sea Bistatic Experiment

  • OCEAN ACOUSTICS. HYDROACOUSTICS
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Abstract

The paper describes the results of an experiment on studying long-range surface reverberation in the deep-water part of the Black Sea. The experiment employed tone pulses with a filling frequency of 2 kHz and a duration sufficient for narrowband spectral analysis. The source and receiver of acoustic signals were spatially offset in the water area; therefore, directional reception and time strobing made it possible to study different situations: forward scattering, bistatic scattering, and monostatic (back) scattering. The paper analyzes the Doppler scattering spectra for different values of the bistatic scattering angle.

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Notes

  1. An acoustic signal that hits the first analysis window, which we call the direct signal, in fact contains the arrivals of a set of modes or rays, which cannot be separated for typical values of the duration and resolving power of signals used in long-range acoustic communications.

  2. Note that vector receivers may help in resolving the given ambiguity, but here such receivers were not applied.

  3. It is not a surface wave with frequency (1) that is resonant, but a wave with frequency (2) for β = 60°, and this results in the 1.5 dB correction.

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ACKNOWLEDGMENTS

The authors thank V.V. Bakhanov, O.S. Bol’shakov, V.V. Gorbatskii, and D.A. Nikitin for assistance in conducting the experimental studies; the authors also thank A.Yu. Kazarova, P.I. Korotin, and B.M. Salin for valuable discussions. The experimental studies were organized by the Future Research Foundation. Equipment for the research was developed within the Program of the basic scientific research of the state academies of sciences (ref. no. 12.18). Research for Sections 2 and 3 was supported by the Russian Science Foundation (grant no. 14-17-00667).

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Correspondence to M. B. Salin.

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Translated by A. Carpenter

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Salin, M.B., Potapov, O.A., Stulenkov, A.V. et al. Study of the Distribution of Reverberation over Doppler Frequencies in a Deep-Sea Bistatic Experiment. Acoust. Phys. 65, 52–59 (2019). https://doi.org/10.1134/S106377101901010X

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  • DOI: https://doi.org/10.1134/S106377101901010X

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