An Improved Backward SBR-PO/PTD Hybrid Method for the Backward Scattering Prediction of an Electrically Large Target

An improved hybrid method of backward shooting and bouncing ray (SBR) physical optics (PO)/physical theory of diffraction (PTD) is proposed to investigate the backward scattering from a three-dimensional electrically large target. The basic idea is to combine the forward-ray-tracing technique to accelerate the original backward-ray-tracing one. The proposed method significantly reduces the computational complexity while ensuring the same computational accuracy with the traditional backward SBR method. The accuracy and performance of our method are validated and evaluated by comparison with the exact computational electromagnetic method (FEKO-MLFMM) and experimental data for electrically small targets. The last case for the warship model illustrates that our method can enable good speedup for electrically large complex objects.