Scattering in inhomogeneous environments with irregular boundaries has ramifications for a number of practical problems of interest to the U. S. Army and other government agencies. Subdividing the problem into smaller and thereby more easily managed units has been successfully exploited. Under this grant new methods were developed that are particularly well suited to highly directed propagation. Propagation at low grazing angles relative to the boundary affords further simplification when ...
A new technique is described that allows computation of the scattering characteristics of an object near a rough surface in terms of the free-space scattering characteristics of the rough surface and the scattering object. The method is applied to the problem of acoustic scatter from a small bubble cloud below the ocean surface. The results show that under most conditions of interest the backscatter from the bubble cloud is enhanced ...
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