Discussions of differences between Scattering Geometrical Optics and line integral of Modified Edge Representation

The Modified Edge Representation is a concept to be used in the integral approximation for computing the surface radiation integrals of diffraction. It applied to the physical optics has remarkable accuracy in the surface-to-line integral reduction even for the curved surface and for sources very close to the scatterer. Geometrical Optics is an approximate high-frequency method for determining wave propagation for incident, reflected and refracted fields. In this paper, these two methods are introduced. The differences between Scattering Geometrical Optics and Modified Edge Representation line integration are discussed in smooth conducting ellipsoid case. The difference term is expressed by mathematical formula.