RCS calculation software system using PTD-TC

We have treated RCS calculations for a large obstacle illuminated by a plane wave. When the size of the scatterer is large with respect to wavelength, the physical optics approximation method (PO) is known to be a useful approach for predicting diffracted or radiated fields. However, the traditional PO approximation is not reliable since it uses the current of geometrical optics. In this paper, we present a method that approximates a patch of the surface to a quadratic one and introduce a transition electromagnetic current determined from the canonical problem for a wedge and/or smooth convex shape, and report the RCS calculation software system. The system presented is called the physical theory of diffraction with transition current (PTD-TC).