An Efficient SBR Method Based on Hierarchical BVH for Dynamic Multi-Target RCS Simulation

An efficient SBR method accelerated by a hierarchical bounding volume hierarchy (HBVH) is proposed for fast RCS simulation of dynamic multiple targets. Unlike conventional approaches that rebuild a single global BVH for the entire scene at each time step, the proposed method adopts a two-level BVH architecture. At the lower level, an independent sub-BVH is built for each dynamic sub-target in its local coordinate system, while at the upper level, a global BVH is constructed to organize these sub-BVHs. During ray tracing, the global BVH is first used to identify the sub-targets intersected by a ray, and local intersection tests are then performed by transforming the ray into the corresponding sub-target coordinate system. This way, sub-BVHs can be directly reused, effectively avoiding the costly global BVH rebuild caused by target motion and enabling efficient ray tracing among multiple moving targets. Numerical results demonstrate that the proposed method achieves more than threefold speedup while maintaining high accuracy.