Long-range sound propagation in the deep ocean is considered. New method for estimation of angular spectrum of pulsed signals is presented. The method is based on the Husimi transform of a wavefield and can be realized with a short vertical array of nondirectional hydrophones. As a result, a diagram of the arrival pattern in the time-angle plane is obtained. The method is applied to a model of the underwater sound channel in the Sea of Japan. Special attention is paid to sound scattering on a cold synoptic eddy along the waveguide. It is shown that the synoptic eddy leads to splitting of individual ray arrivals into clusters with close angles and times.
展开▼
