Fast RCS calculation technique for targets coated with multi-layer RAM

A fast radar cross section (RCS) calculation technique for targets coated with multi-layer radar absorbing materials (RAM) was presented. The targets were modeled as a combination of facets and wedges. Physical optics (PO) method and impedance boundary condition (IBC) were used for RCS calculation of coated facets. Physical theory of diffraction (PTD) combined with method of equivalent edge current (MEC) was applied for the scattering computation of coated wedges. During the RCS calculation, matrices of reflecting coefficient were pre-calculated and stored. This greatly improves the speed of scattering calculation. RCS of single-layer and multi-layer coated plates and typical revolving solids were calculated, demonstrating that results have good agreement with those in reference. Further results of complex target show the validity of this method in improving accuracy and computing speed.