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PO with Modified SurfaceNormal Vectors for RCS Calculation of Scatterers with Edges and Wedges
Nobutaka OMAKI Tetsu SHIJO Makoto ANDO
Publication
IEICE TRANSACTIONS on Electronics
Vol.E92C
No.1
pp.3339 Publication Date: 2009/01/01 Online ISSN: 17451353
DOI: 10.1587/transele.E92.C.33 Print ISSN: 09168516 Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Electromagnetic Theory and its Application) Category: Keyword: physical optics, geometrical theory of diffraction, physical theory of diffraction, modified surfacenormal vectors,
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Summary:
We have proposed a unique and simple modification to the definition of surfacenormal vectors in Physical optics (PO). The modified surfacenormal vectors are so defined as that the reflection law is satisfied at every point on the surface. The PO with currents defined by this new surfacenormal vector has the enhanced accuracy for the edged scatterers to the level of Geometrical Theory of Diffraction (GTD), though it dispenses with the knowledge of high frequency asymptotic techniques. In this paper, firstly, the remarkable simplicity and the high accuracy of the modified PO as applied to the analysis of Radar Cross Section (RCS) is demonstrated for 2 dimensional problems. Noteworthy is that the scattering not only from edge but also from wedge is accurately predicted. This fringe advantage is confirmed asymptotically by comparing the edge and wedge diffraction coefficients of GTD. Finally, the applicability for three dimensional cube is also demonstrated by comparison with experimental data.


