Radar Cross-Section of Targets using Beam wave incidence for Horizontal Polarization

The behavior of RCS of partially convex targets taking large sizes up to five wavelengths in free space was evaluated. The scattering problems of plane and beam wave incidences were considered. In this study, the effects of the target configuration together with beam width on the laser RCS (LRCS) compared to the case with plane wave incidence were clarified. When the target size becomes larger enough than the beam width, it was found that target curvature has a slight effect on the LRCS behavior. On the other hand of the later case, the LRCS was proved to differ obviously from RCS for plane wave incidence and that difference increases with target size. At certain limit, LRCS diminishes with large enough target and the beam wave incidence becomes incapable of target detection. For larger beam width, LRCS becomes closer to RCS for plane wave incidence, however, it changes obviously with target curvature