The classical Kirchhoff formula in the iterative physical optics (IPO) approach, which was brought forward by Obelleiro(1995), has been replaced by a Kirchhoff formula with line integral form. Based on the new method, an improved IPO approach has been presented. The numerical precision of computation results obtained by the improved IPO approach is almost the same as that of the results computed by IPO approach in Obelleiro s paper(1995). However, the new approach reduces the computation time greatly in analyzing the electroniag- netic scattering of large open-ended concave cavities such as a trihedral corner reflector and an aircraft cockpit, etc.
F. Olelleiro, et al., An interative physical optics approach for analyzing the electromagnetic scattering by large open-ended cavities, IEEE Trans. on AP, 1995, AP-43(4), 356-361.[2]Gu Changqing, Xu Jinping, Kirchhoff formula with line integral form and its applications, 南京航空航天大学学报(英文版), 1999, 16(2), 183-187.[3]A.C. Polycarpou, et al., Radar cross section of trihedral corner reflectors: theory and experiment.Electromagnetics, 1995, 15(2), 457-484.[4]阮颖铮,等,雷达截面与隐身技术,北京,国防工业出版社,1998,第四章.
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