Modified Physical Optics Approximation for RCS Calculation of Electrically Large Objects with Coated Dielectric

The Radar Cross Section of a target plays an important role in the detection of targets by radars . This paper presents a new method to predict the bistatic and monostatic RCS of coated electrically largeobjects. The bodies can be covered by lossy electric and/or magneticRadar Absorbing Materials (RAMs) . These materials can be approximated by the Fresnel reflection coefficients . The proposed method uses modifiedPhysical Optics (PO) approximation to obtain the object scattered field . One of the advantages is the use of Stationary Phase Method (SPM) to solve the PO integral . This is because the SPM reduces significantly thecomputation time required to solve this integral as compared to rigorously numerical integration techniques . Simulationresults are presented to verify the accuracy and efficiency of the proposed method.The results are compared with commercial FEKO and CST software in order to show its superiority as far as the computation time is concerned .

کلیدواژه ها:

Asymptotic techniques ، Physical optics (PO) ، Approximation ، Radar cross section (RCS) ، Coated objects ، Modified PO