MEMORANDUM ON ANALYSIS OF ECHO AREA OF TARGETS USING GEOMETRICAL THEORY OF DIFRACTION AND CREEPING WAVE THEORY - 2430-1
OHIO STATE UNIV COLUMBUS ELECTROSCIENCE LAB
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A combination of creeping-wave analysis and diffraction theory has been developed for determining the radar cross section of bodies for which exact solutions are not available. The known solutions for the perfectly conducting cylinder and sphere have been used to specify attenuation and diffraction coefficients for the creeping wave. The creeping wave contribution is added to the geometrical optics or physical optics contribution from the specular point to determine the total scattered field. It is demonstrated that this type of solution is applicable to ogives, ogives with spherical caps, and prolate spheroids. Wedge diffraction theory has been combined with creeping wave analysis to calculate the edge-on backscatter of circular and ogival disks. It is necessary to modify the magnitudes, but not the forms, of the creeping wave attenuation and diffraction coefficients when treating a creeping wave on an edge. This form of analysis is adaptable to calculation of the radar cross section of composite bodies where both volumetric shapes and edges may occur in combination. Once the specular points, wedge diffraction points, and the attachment points and paths of the creeping waves are determined the computation of the scattered field is straightforward.
- Active and Passive Radar Detection and Equipment