The propagation of pulsed pseudo-random signals from the shelf into the deep sea during the winter hydrological conditions of the Japan Sea

The article discusses the results of an experiment conducted in the Japan sea in March 2016 on the acoustic track length of 194 km at the winter hydrological conditions. It was the most complicated case of propagation of pulsed pseudo-random signals from the shelf into the deep sea in the presence of acoustic track the vortex formation. Analysis of experimentally obtained impulse response showed that apparent at all points in the maximum first arrival of acoustic energy is in good agreement with the calculation. This suggests that the horizon of reception of the first pulses come, the past in the near-surface sound channel at the shortest distance and at small, close to zero angles.