Effect of the Weakly Divergent Acoustic Beam on the Space-Time Structure of Pulsed Signals in the Underwater Sound Channel

On the example of an underwater sound channel typical for the Philippine Sea [1–3], it was established by numerical simulation using the mode theory that during experimental studies of the propagation of explosive signals by R.A. Vadov [1–3] the manifestation of the weakly divergent beam in the space-time structure of the acoustic field was observed for the first time. The effect consisted in the registration at certain locations of the corresponding points in the oceanic waveguide, along with the classical quadruples of pulses, of additional acoustic signals with small time delays relative to them.