Verification of Shadow Region Effect on Radar Cross Section of Targets Using Physical Optics Method

Abstract

Abstract-Our method that uses current generator operator assumes the current on the entire surface of conducting scatterers. While, Physical Optics (PO) method assumes that the surface current generates only on the illumination region. The effect of the shadow region on the scattering waves is, therefore, proved by comparing our exact method with PO method. In this regard, radar cross-section (RCS) is calculated for smooth concave-convex contour. We work on numerical calculation of the RCS and analyze its characteristics with different target configurations including complexity and size. Concave illumination region is postulated with considering targets are taking large sizes of about five wavelengths. Here, we assume waves propagation and scattering from targets in free space and horizontal polarization (E-wave incidence).

A Convenient Analytical Framework for Electromagnetic Scattering From Composite Targets

“…Unfortunately, in the current literature there are few analytical models for the determination of RCS of composite targets (Barrick, ; El‐Ocla & Tateiba, ; Tateiba et al, ), even under the geometrical optics (GO) and the physical optics (PO) approximations. Several attempts have been made to find general and compact expressions for the bistatic scattering matrix starting from the more general framework of KA, but analytical formulas for the scattering coefficients are obtained only under the KA‐GO approximation (Elfouhaily & Guérin, ; Jin & Lax, ; Stogryn, ).…”

Analysis of backscattering enhancement for partially convex targets in random media for plane and beam wave incidences

“…The current generator is expressed in terms of wave-functions which satisfy Helmholtz equation and the radiation condition, and is well defined in [3,4]. For the second scattering problem, the excitation is chosen to be uniform plane and beam waves.…”

“…Recently we have presented numerical results for the backscattering enhancement in RCS of conducting cylinder with a concave-convex cross-section [3,4]. It has been found that the target configuration together with the SCL of the incident wave around the target play a leading role in determination of the RCS of partially convex targets.…”

Indirect method of RCS estimate of conducting target in random medium

“…In earlier study, we aimed to apply our method on partially convex targets in random media with limited sizes and presented numerical results for exact RCS estimate and backscattering enhancement with putting into account the polarization of incident waves [4]- [6]. Later, we extended our study and considered large size targets in different random media [7].…”