Robust and GPU-accelerated IPO to improve high frequency EM scattering from large scale radar scene simulation

Tools for electromagnetic simulation make EM computations down to millimeter wavelength possible from large complex targets and their environments. In this paper, we present how we add localized support for N-OP, most useful for cavities and other complex objects subject to multiple reflections, to our shooting-and-bouncing-ray SE-RAY-EM software. This extension is made with the Iterative Physical Optics (IPO) method, which we improve to make it suitable for use in intensive EM simulation of large scale scenes with localized N-OP bounces accuracy. As we present, this requires a generalization in materials, numerical robustness, computational efficiency and a more precise hybridization method than existing work.