Time-Domain Iterative Physical Optics Method for Analysis of Em Scattering From the Target Half Buried in Rough Surface: Pec Case

Abstract

Abstract-In this paper, time-domain physical optics (TDPO) method is extended to its iterative version (TDIPO) to consider the coupling effects between two regions, and the latter is employed to investigate electromagnetic scattering from three dimensional target half-buried by a two dimensional rough surface. By using iterative scheme, more accurate transient response reflected from combinative target with multi-scattering effects would be obtained than that by using TDPO alone. The TDIPO could also be enhanced by time-domain equivalent edge current (TDEEC) to further determine the far-field characteristics of the combinative target with rough surface. An accurate composite geometry model technique which combines 2D perfectly electrically conducting (PEC) rough surface and half-buried 3D PEC target is introduced and employed to assist the meshing work. The validity of the presented method is verified by comparing the scattering results for dihedral targets with those obtained through TDPO and finite difference in time domain (FDTD), as well as multi-level fast multiple algorithm (MLFMA). Then simulations of EM scattering from the target embedded in rough surface for different incidence directions are carried out to test the availability of TDIPO/EEC. Discussions on the effects of incidence direction and the presence of the target on the backscattering in farzone are also given.

Multi-Feature Based Detection of Landmines Using Ground Penetrating Radar

“…Moreover, if the ground has a rough surface such as in the real field, or if part of a landmine is embedded in a rough surface, a reflection pattern from the ground, which is significantly different from that considered in this work, would be obtained. For this case, methods such as [59] and [60] needs to be taken into account in the proposed method. It is expected that if the proposed method is evaluated and refined through extensive tests with various landmines and ground conditions, the false alarm rate could be further reduced.…”

Fringe Waves in an Impedance Half-Plane

“…This concept is valid and accurate for metallic scatterer surfaces and gives exact geometric optics (GO) waves in the high frequencies. There are lots of studies in the literature about the application of the PO method [1][2][3]. The edge diffracted fields which are found from the contribution of the PO surface integral are not correct.…”

Higher Order Method of Moments for Bistatic Scattering From 2d Pec Rough Surface With Geometric Modeling by Nurbs Surface

“…The purpose of this paper is efficiency and accuracy in calculating the bistatic scattering from 2D PEC rough surface by the HMOM based on the previous work [13,[19][20][21][22] of our research teams. To our knowledge, this is the first time that the HMOM is introduced to calculate the BSC of rough surface, and the BSC is obtained and compared to that of LMOM with RWG or rooftop basis function to verify the validity.…”