Angular correlation function of wave scattering by layered rough surfaces with buried PEC cylinder

The electromagnetic scattering form a electric conducting (PEC) target buried in layered rough surfaces is investigated, for the case of TM polarization, using the a fast Cross Coupling iterative Approach (CCIA) based on bi-conjugate gradient method (Bi-CG) and forward backward method (FBM). The scattering of waves by a buried object is often obscured by the clutter around it. Recent studies show that, because of the memory effect, the angular correlation function (ACF) can suppress the effects and make the scattering by the buried object more conspicuous. In this paper, the layered rough surface with two Gaussian profiles is used to emulate the realistic situation, while the tapered incident wave is chosen to reduce the truncation error. The Monte-Carlo procedure is employed to calculate the ACF, which is depended on the depth, size and horizontal position of the buried target, as well as the properties of the profiles. The enhancement of the ACF on the non-memory line can be used to detect a target below the layered rough surfaces.