OpenGL-Based Hybrid GO/PO Computation for RCS of Electrically Large Complex Objects

In this letter, a novel method is proposed to assess the simulation of scattered fields from electrically large complex metallic objects. The basic idea is to employ Open Graphics Library (OpenGL) to accelerate paths tracing for geometrical optics (GO) and physical optics (PO) hybrid method. The procedure of OpenGL-based paths tracing is divided into two steps, which are shadow faces removal and reflected rays searching. In addition, some OpenGL speedup schemes have been proposed to improve the efficiency of this algorithm. Based on this, the GO/PO hybrid method can yield a superior performance for scattering analysis of large complex targets, especially at high frequency. Simulation results obtained from this model are verified by comparison to FEKO-MLFMM results, which proves an excellent accuracy computation, and the last example for an airplane model illustrates that the method we present can be very fast even at electrically large complex objects.