Physical Optics Analysis for RCS Computation of a Relatively Small Complex Structure
Keywords:
Complex structure, Integral Equation (IE), Method of Moments (MoM), Physical Optics (PO) and Radar Cross Section (RCS)Abstract
High-frequency methods are well known as a convenient approach for treating Electromagnetic (EM) problems regarding electrically large structures. In this paper however, this method is proposed as a proper tool for computing the mono-static Radar Cross Section (RCS) of a relatively small complex structure. This claim has been verified via simulation through a frequency range of 100 MHz to 10 GHz and measurement for the structure of this work. In this regard, initially, RCS computation via the Method of Moments (MoM) has been executed. As this method leads to rigorous and time consuming computations, Physical Optics (PO) has been utilized for the same purpose. These computations have been carried out by employing the Integral Equation (IE) and asymptotic solver of CST Microwave Studio (MWS). PO proves to be timeefficient compared to MoM. Graphs comparing PO and MoM-computed RCS are illustrated. In addition, the similarity of the results obtained by PO and MoM has been thoroughly discussed. Correlation between these results has been observed. Also, mean and standard deviation values for PO RCS-error have been provided for the entire simulation frequency. As dimension to wavelength ratio (D/?) of the structure increases, the convergence of these two methods for RCS computation becomes satisfactory. Finally, measurement has been accomplished at frequency of 8.5 GHz to validate PO computations. Index Terms ? Complex structure, Integral Equation (IE), Method of Moments (MoM), Physical Optics (PO) and Radar Cross Section (RCS).
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