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

Abstract

Fields due to electromagnetic waves propagating in continuous random media are calculated efficiently, by a method that uses a current generator, M. Tateiba et al. (1992). This method solves the problem of wave scattering from targets in random media as a boundary value and this technique of solution is important for radar detection of a target of finite size. This method uses two operators: the current generator that transforms the incident wave falling on the target into the surface current and Green's function in the random medium. In earlier investigation, Z. Q. Meng et al. (1996), numerical results for radar cross-section (RCS) of conducting convex bodies such as circular and elliptic cylinders have elucidated that the spatial coherence length (SCL) of incident waves around a target is one of the key parameters for the clarification of random media effects on the RCS. The shape of the target is one of the parameters that constitute an important factor in the radar detection problem. Recently we have presented numerical results for the backscattering enhancement in RCS of conducting cylinder with a concave-convex cross-section. 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. To render a satisfactory understanding of the backscattering enhancement behavior for the concave-convex targets in random media, we analyze the scattering problems for plane wave propagating in continuous random media and beam waves in free space for vertical polarization.