Adaptive Supersampling of Rays for Accurate Calculation of Physical Optics Scattering From Parametric Surfaces

This letter presents an algorithm for supersampling of rays in order to accurately calculate physical optics scattering from parametric surfaces. Based on the differential geometry calculus, the algorithm adaptively adjusts the ray resolution after each ray-object intersection. This way, the curvature of the surface and the resulting divergence of the wavefront are properly taken into account. Consequently, the ray-tracing method can accurately determine the illuminated region on the object surface. The simulation results show the effectiveness of the presented algorithm in improving the accuracy of radar cross section calculation while retaining the computational efficiency.