一种隐身目标电磁散射特性的计算方法

针对空空导弹无线电引信,用广义的雷达有效散射截面(CRCs)描述隐身目标近场散射特性.对覆盖吸波涂层的目标,以组合的三角形平面单元拟合目标的几何外形.利用物理光学法和物理绕射理论1]计算目标每一单元的散射场和绕射场.考虑目标上的二次反射,计算无线电引信接收天线径上的目标电磁散射场.无线电吸波涂层目标的反射系数采用迭代方法计算,其方法可适用于具有任何类型电磁参数涂层的目标.以长空靶机和靶5目标为例,计算了其近场散射特性,为无线电引信设计提供参考依据.目标近场电磁散射特性的计算方法适用于隐身目标和非隐身目标.

A method for EM scattering feature calculation Of stealth target

The near field EM scattering of the stealth target is described by Generalized Radar Cross-Section(GRCS) for air to air missile radio fuzes.For a target with absorbing coating,the combined triangle elements are used for approaching its geometric surface.The EM scattering and diffraction field of each element is computed by using physical optics and physical diffraction theory.The secondary reflections of triangles are also considered,and the EM scattering field of the target on receiving antenna of radio fuze is calculated out.The iterative arithmetic is used for computing the reflection coefficient of the target with radio absorbing coating,which is applicable for the targets with coating of any kinds of EM parameters.In the end,taking Changkong drone target and Drone 5 as examples,the EM scattering features of them are calculated out,which supplies a reference for radio fuze design.The computation method for near field EM scattering is suitable for both stealth targets and non-stealth targets.