UACE2017 Proceedings: On the mechanisms of scattering of low-frequency sound on surface waves

Session:
Sonar performance modeling and verification, Applications to active and passive sonar
Paper:
On the mechanisms of scattering of low-frequency sound on surface waves
Author(s):
Mikhail Salin, Oleg Potapov, Dmitry Razumov, Boris Salin
Abstract:
Narrow-band spectra of sound backscattering were investigated in a series of experiments with frequencies around 1 – 3 kHz. Two types of scattering spectra are distinguished. In the first case, side-lobes are observed at a certain distance from the carrier frequency. This effect is caused by Bragg scattering on surface waves. In the second case, a smooth broadening of the spectrum around the carrier frequency is observed. In this case, the reverberation spectrum is interpreted using the phenomenological model of sound scattering at subsurface inhomogeneities. These inhomogeneities are moving along circular tracks under the action of wind waves currents, which velocities are rather smaller than the phase velocities of surface waves.
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Contact person:
Dr Mikhail Salin
e-mail:
Affiliation:
Federal Research Center The Institute of Applied Physics RAS (IAP RAS)
Country:
Russian Federation