RCS Calculation of Electrically Large Targets by Iterative Bidirectionally Ray Tracing Method

An efficient electromagnetic (EM) scattering solution of iterative bidirectionally ray tracing method has been proved to analyze the scattering from electrically large bodies with multiple reflection structures. The algorithm starts by building a bidirectionally ray tracing in both incident and backward observed directions. More specifically, both the multiple geometric optical reflections and physical optical scatterings are taken into consideration during the process of ray tracing. Meanwhile, the selected current interactions are iterative accounted so as to obtain the reradiation effect for the multiple reflections. On this bases, the reradiation effect supplements the mechanism of the nonspecular scattering obtained on side lobe directions and achieves higher accuracy than the ray tracing-based method. After that, the target-coupled edge diffraction theory is used to modify the target scattering field to obtain valuable RCS results. The EM scatterings from complex structures are simulated to verify the performance of the proposed method.