基于天线方向图与近场SBR的海面舰船复合散射研究

Composite scattering from sea and ship based on antenna pattern and near field SBR

针对弹目交互场景中近场电磁散射仿真问题,提出了一种基于近场弹跳射线(shooting and bouncing ray, SBR)法并考虑天线方向图影响的海面舰船复合散射计算模型.根据天线方向图和海面舰船一体化几何模型,给出满足物理光学远场计算条件的面元所接收到的电场强度,通过SBR法得出所有面元的散射场,最后由矢量叠加得到舰船目标的近场雷达散射截面.该模型的计算结果与商业软件FEKO的数值方法对比吻合较好,可用于分析海面舰船复合近场散射特性.

In order to solve the problem of near-field electromagnetic scattering simulation in an interactive scene of missile and target, this paper presents a calculation model based on near-field shooting and bouncing rays(SBR)under the influence of antenna patterns. According to the antenna patterns and the complex geometry between the ship and the sea surface, the electric field intensity received by the surface elements satisfying the far-field conditions of physical optics is given. The scattering fields of all surface elements are determined by the bouncing ray method.Further, the near-field radar cross section of the ship target is measured with vector superposition. The results of the model are in good agreement with the numerical computations in FEKO, which can be used to analyze the near-field scattering characteristics of ships on sea surface.