Hybrid method for investigation of electromagnetic scattering from conducting target above the randomly rough surface

A current based hybrid method (HM) is proposed which combines the methodof moment (MOM) with the Kirchhoff approximation (KA) for the analysisof scattering interaction between a two-dimensional (2D) infinitelylong conducting target with arbitrary cross section and aone-dimensional (1D) Gaussian rough surface. The electromagneticscattering region in the HM is split into KA region and MOM region.The electric field integral equation (EFIE) in MOM region (target)is derived, the computational time of the HM depends mainly on thenumber of unknowns of the target. The bistatic scatteringcoefficient for the infinitely long cylinder above the rough surfacewith Gaussian roughness spectrum is calculated, and the numericalresults are compared and verified with those obtained by theconventional MOM, which shows the high efficiency of the HM.Finally, the influence of the size, location of the target, the rmsheight and correlation length of the rough surface on the bistaticscattering coefficient with different polarizations is discussed indetail.