This paper introduce a rapid RCS prediction system emX for complex targets using physical optics

geometry optics

physical theory of diffraction and graphic hardware. This paper focused on the RCS computation of electrically large

complex and perfectly targets. The faceting approach is used to model the target's geometry. This paper uses the close form solution of physical optics and the graphic hardware to accelerate RCS computation. The results show that this method is an efficient RCS rapid prediction method.