Abstract
Intensity fluctuations of the low frequency LFM signals (band 270–330 Hz) were observed in Shallow Water 2006 experiment in the presence of moving train consisting of about seven separate nonlinear internal waves crossing acoustic track at some angle (~ 80º). It is shown that spectrum of the sound intensity fluctuations calculated for time period of radiation (about 7.5 minutes) contains a few peaks, corresponding to predominating frequency ~6.5 cph (and its harmonics) and small peak, corresponding to comparatively high frequency, about 30 cph, which is interpreted by authors as manifestation of horizontal refraction. Values of mentioned frequencies are in accordance with theory of mode coupling and horizontal refraction on moving nonlinear internal waves, developed earlier by authors. [Work was supported by BSF.]
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