Properly Normalized RCS Under a Tapered Incident Wave for Rough Surface Scattering Using SSA Method

Two different explicit formulations of incident power are proposed to calculate the normalized radar cross section (RCS) scattering from the ocean-like surfaces illuminated by a tapered wave. The tapered wave is applied to circumvent artificial reflections from the edges of illuminated finite surface. Explicit formulations of incident power are derived by using two different types of Poynting vectors. The scattering field can be calculated by the first-order small slope approximation (SSA-I) method. The resulting normalized RCS analysis are demonstrated to verify the validity of the proposed method, compared with the experimental results.