Hybrid analytical-numerical algorithm for computation of scattering from a 3D PEC target above a dielectric rough surface

作者：Ye Hong Xia^*; Jin Ya Qiu

来源：Chinese Journal of Radio Science, 2008, 23(6): 1144-1153+1187.

• Coupling iteration
• Dielectric rough surface
• Electromagnetic scattering
• Kirchhoff approximations
• Numerical iterative algorithm
• Surface equivalence principle
• Surface integral equations
• Tangential plane approximations

This paper presents a hybrid analytical-numerical iterative algorithm, which combines the Kirchhoff Approximation (KA) for rough surface and the Method of Moment (MoM) for target, to compute the electromagnetic scattering from a three-dimensional (3D) PEC target above a dielectric rough surface. The coupling surface integral equations (SIEs) for the composite model are derived based on the Green's function of half-space and the Huygens surface equivalence principle. The KA expression for the scattering field of rough surface is derived based on the tangential plane approximation and the right helix relationship. The iteration of KA and MoM takes account the interactions between target and the underlying rough surface. Since is only one numerical integral of induced current on the target performed by KA computation, much memory and computation time is reduced. Convergence and effectivity of the hybrid KA-MoM algorithm is numerically validated, and the effectivity condition is derived. With Monte-Carlo method to generate randomly rough surface samples, an example of bistatic scattering from an irregular hexahedral target above a Gauss rough surface is numerically simulated. Dependences of bistatic scattering pattern upon the surface dielectric property and the target geometry are discussed.

• 出版日期2008
• 单位复旦大学