Specifics of the Deepwater Reception of Pseudo-Random Pulse Signals Propagating from the Shelf towards the Deep Ocean

The results of an experiment conducted in September 2017 are considered with regard to the applicability of the acoustic “mudslide” effect for positioning autonomous underwater vehicles (AUV) operating substantially deeper than the axis of the deep sound channel (DSC). The results of the experimental study and numerical analysis of the effect of focusing acoustic energy in the bottom layer on the Sea of Japan shelf and transitional zone with the deep water (up to 500 m deep) for summer-autumn hydrological conditions are presented. Mathematical modeling of the propagation of acoustic waves in a waveguide reproducing the experimental conditions using the parabolic equation method has been performed. The effective propagation velocities of the signal are explained in terms of the modal-analysis method.