Radar Signature Prediction

Our technical objective is to investigate the feasibility of a general framework for solving high-frequency scattering and radiation problems, based on combined rigorous high-frequency and low-frequency methods, and to develop a new electromagneticsimulation code based on that framework. We envisage a computational scheme encompassing three main elements: (1) geometrical optics method based alternatively on ray tracing or wavefront evolution methods, (2) rigorous asymptotic high frequency expansionfor the integral equations for surface currents, (3) rigorous low-frequency numerical fast solution methods, also for surface current integral equations. A novel feature of our approach is a mutual coupling of these elements, forming a consistent andrigorous high-frequency asymptotic expansion scheme, without any arbitrary approximations introducing uncontrollable errors. During Phase I, we shall develop a self contained software prototype which will demonstrate the feasibility of the proposedsolution scheme. Significant improvement over the capabilities of the existing high frequency algorithms which are of interest to DoD and industry will be achieved. In particular, accurate simulation of electromagnetically large, realistic targets withsubwavelength details will be possible at dramatically reduced memory and computational time requirements.