The scattering problem has been solved as a boundary value problem using a method that has been presented in many of my publications (e.g., [1-4], where other references are available). It has been proved that radar cross section (RCS) changes obviously with the illumination region curvature [1] and polarization [2, 4]. Research on laser radar [5] for target ranging, detection, and recognition [6] has become the one key technology to evaluate and model the characteristics of scattering from a complex target in the military and civil applications. In this regard, the scattering characteristics are analyzed through studying the behavior of laser RCS (LRCS) of the target. In doing that, one can calculate the LRCS by assuming a beam wave incident on a nonconvex target in free space as proposed in [3]. In fact, we can consider the beam wave as a plane wave when the mean size of the target becomes smaller than the beam width, however, this is not usually the general case practically. To detect targets of larger sizes, we should, therefore, handle the case where the beam width is smaller than the target size. ere, we evaluate the effects of the target configuration including size and curvature on the RCS of target for the two cases of plane and beam wave incidences. To Achieve this aim, we draw on our method described earlier to conduct numerical results for the RCS of concave-convex targets of large sizes up to about five wavelengths to be bigger enough than the beam width. Polarization of incident waves is one of the primary keys that affects the scattering waves. Here, we assume linear polarization including E-wave incidence and H-wave incidence.
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