Difference RCS of electromagnetic scattering from the target above a randomly rough surface

The difference field RCS (d-RCS) has been defined to analyze the scattering from the target above a rough surface, which takes account of the scattering from the target and multiple interactions of the target and underlying rough surface. The d-RCS removes the effect of the finite illuminated surface length, under the tapered wave incidence. In this paper, our newly fast iterative approach is briefly reported. The electric field integral equations (EFIE) of the difference induced current oil the rough surface and the induced current oil the target are derived. An iterative approach is developed to solving the two EFIEs and scattering from both the target and underlying surface. How to choose the illuminated length of the rough surface for numerical iterations is discussed. Using the Monte Carlo method to realize the ocean-like rough surface, bistatic scatterings from the target, e.g. a cylinder or a square column, above a P-M (Pierson-Morkowitz spectrum) rough oceanic surface are numerically simulated for TE tapered wave incidence.