Abstract
The experimental results of Shallow Water 2006 experiment (SW06) and theoretical estimations of the key parameters are presented for observation of non-stationary interference pattern provided by “direct” and reflected acoustic signals (acoustic Lloyd mirror effect) in shallow water. Propagation of low-frequency LFM chirp signals with the center frequency of 300 Hz and the bandwidth of 30 Hz on an acoustic track of about 20 km was studied. Refraction in the horizontal plane is caused by the wave front of the nonlinear internal waves (NIWs) moving across the acoustic track. Analysis of the non-stationary interference pattern on the horizontal and vertical line arrays and theoretical estimations give the angle of horizontal refraction (angle between direct and reflected rays) and the velocity of NIW. Results of estimations are in a good agreement with experimental data. [Work supported by ONR.]
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