Calculating the RCS (Radar Cross Section) of two 3D scatterers needs to numerically solve a set of integral equations involving numerous unknowns. Such a 3D problem can not be solved easily with a conventional Method of Moments (MoM) by using a direct LU inversion. Thus, a hybridization between the Extended Propagation-Inside-Layer Expansion (E-PILE) and the Physical Optics approximation (PO) reduces signicantly the memory requirements and CPU time. The resulting method called E-PILE+PO. In this work, we take advantage of the rank-decient nature of the coupling matrices, corresponding to scatterer 1 (the object) and scatterer 2 (the rough surface) interactions, to further reduce the complexity of the method by using the Adaptive Cross Approximation (ACA).
"Bistatic EM Scattering Analysis of an Object Above a Rough Surface Using a Hybrid Algorithm Accelerated with the Adaptive Cross Approximation Method," Progress In Electromagnetics Research M,
Vol. 82, 19-28, 2019. doi:10.2528/PIERM19022003
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