A modified physical optics technique for obtaining electromagnetic signatures of objects with edges totally immersed in the ocean

In previous papers (1,2) the utility of the physical optics approximation in predicting the electromagnetic signatures of conducting bodies immersed in the ocean was investigated. It has been shown that the physical optics approximation gave excellent agreement with exact results for spheres or radius of one skindepth or larger of the electromagnetic radiation in sea water and good results for spheres down to a radius of one tenth of a skin- depth. The greatest disagreement incurred between the exact and approximate results was about three dB in the latter case. The results were subsequently extended to more complex bodies such as the cylinder, ellipsoid and superellipsoid. In this work the results obtained in the next logical sequential step in generalizing this approach to objects with sharp edges will be presented.