A Semi-Analytical Scattering Model for Efficient Radar Scattering Simulation of the Composite Scenes

In this communication, we introduce a semi-analytical shooting and bouncing ray (SBR) modified by ray refinement technology to address the complex multiple scattering components in composite scenes. Compared to the traditional SBR method, the proposed method reduces the ray number and tracing times while maintaining accuracy, thereby significantly enhancing computational efficiency. Furthermore, we refine the computation of the reflection coefficient based on the bistatic scattering coefficient. This refinement makes the model suitable for simulating coupling scattering between targets with rough surfaces. We apply the proposed method to calculate the radar cross section (RCS) of both a cube-sea surface model and a freighter-sea surface model. The results obtained are then compared with those of the parallel multilevel fast multipole algorithm (PMLFMA). Additionally, the calculation efficiency of the proposed method is compared with that of the traditional SBR. The validation results demonstrate that our method achieves accuracy comparable to PMLFMA and improves efficiency by tens of times when compared with the traditional SBR.