Journal
ACOUSTICAL PHYSICS
Volume 63, Issue 6, Pages 673-680Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S1063771017060100
Keywords
acoustic array; underwater sound channel; acoustic pulse; Husimi transform; ray approximation
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Funding
- Russian Foundation for Basic Research [16-35-60040-mol_a_dk, 16-05-01074-a]
- program Mathematical simulation and analysis of dynamical processes in the ocean of Il'ichev Pacific Oceanological Institute [AAAA-A17-117030110034-7]
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We consider a recently developed method to analyze the angular structure of pulsed acoustic fields in an underwater sound channel. The method is based on the Husimi transform that allows us to approximately link a wave field with the corresponding ray arrivals. The advantage of the method lies in the possibility of its practical realization by a vertical hydrophone array crossing only a small part of the oceanic depth. The main aim of the present work is to find the optimal parameter values of the array that ensure good angular accuracy and sufficient reliability of the algorithm to calculate the arrival angles. Broadband pulses with central frequencies of 80 and 240 Hz are considered. It is shown that an array with a length of several hundred meters allows measuring the angular spectrum with an accuracy of up to 1 degree. The angular resolution is lowered with an increase of the sound wavelength due to the fundamental limitations imposed by the uncertainty relation.
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