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<p>This paper presents an efficient finite element method (FEM)-based approach for analyzing the radar cross section (RCS) of perfect electric conductor (PEC) and dielectric-coated PEC structures. To address the increasing computational complexity in bistatic RCS simulations with numerous observation directions and complex geometries, we propose a novel optimization strategy. The method separates direction-independent surface operations from direction-dependent calculations by precomputing per-face vector terms and using vectorized matrix operations for directional integration. To validate the accuracy of the proposed method, numerical results are first compared with Mie theory for a PEC sphere and with commercial solver HFSS for complex missile structures. Simulation results demonstrate that the proposed technique reduces RCS computation time by up to 23.6 times compared to the conventional approach, achieving total runtimes under 30 seconds for all test cases. The proposed method maintains high accuracy while significantly improving computational efficiency and is well suited for real-time or large-scale electromagnetic scattering analysis.</p>

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Efficient FEM-based Bistatic RCS Evaluation for Complex Geometries via Vectorized Loop Reduction

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Hyeonyeol Na,
  • Woobin Park,
  • Sunghan Lee,
  • Woochan Lee

摘要

This paper presents an efficient finite element method (FEM)-based approach for analyzing the radar cross section (RCS) of perfect electric conductor (PEC) and dielectric-coated PEC structures. To address the increasing computational complexity in bistatic RCS simulations with numerous observation directions and complex geometries, we propose a novel optimization strategy. The method separates direction-independent surface operations from direction-dependent calculations by precomputing per-face vector terms and using vectorized matrix operations for directional integration. To validate the accuracy of the proposed method, numerical results are first compared with Mie theory for a PEC sphere and with commercial solver HFSS for complex missile structures. Simulation results demonstrate that the proposed technique reduces RCS computation time by up to 23.6 times compared to the conventional approach, achieving total runtimes under 30 seconds for all test cases. The proposed method maintains high accuracy while significantly improving computational efficiency and is well suited for real-time or large-scale electromagnetic scattering analysis.