SHORT-WAVE DIFFRACTION OF AN ACOUSTIC FIELD AT A RIGID SCATTERER IN AWAVE-GUIDE WITH A ROUGH-SURFACE

The problem of short-wave diffraction of a multimode acoustic signal a t a rigid object is considered in the framework of the Kirchhoff physi cal diffraction model and the radiation transfer equation for the seco nd moment of the Green's function, taking into account the waveguiding character of propagation and the effects of multiple scattering of so und from a rough ocean surface. Basic formulas for the intensity and c orrelation characteristics of the diffracted field in the far zone of a stationary and moving scatterer are derived. Results of numerical ca lculations for the typical conditions of a shallow sea are presented a s obtained under the assumption that the main source of fluctuations o f a sound signal is the wind-agitated sea.