计算任意导体直劈边缘瞬态散射的TD-EEC公式

对频域等效边缘流(Equivalent edge current EEC)公式进行傅里叶逆变换,推导出时域等效边缘流(TD-EEC)的计算公式,可用于计算任意导体直劈边缘在任意观察方向的远区时域绕射场,且绕射线在焦散区内保持有限。TD-EEC的时域边缘绕射的计入明显改善了TD-PO方法的计算结果,能够用于电大尺寸复杂导体目标的瞬态散射和宽带散射分析以及雷达原始回波的模拟。最后,以平板和劈柱为例进行瞬态电磁散射计算,并将计算结果同TD-PO和时域有限差分(FDTD)的计算结果进行比较,验证了方法的正确性和有效性。

Formulas of TD-EEC for transient scattering computation of arbitrary straight conducting wedge edge

Time-domain equivalent edge current(TD-EEC) formulas are derived via the inverse Fourier transform of frequency-domain equivalent edge current(EEC) formulas,which is applied to the time-domain far-field analysis of diffraction by conducting straight wedge edges on arbitrary aspect,thereby yielding finite results at the caustics of diffracted rays.By adding the diffracted field predicted by the TD-EEC,a significant improvement is obtained compared to what is achieved by using TD-PO alone,which can be used to analyze the transient and wide-band scattering of electrical large conducting complex targets and simulate the origin echoes of radar.Finally,the transient scattering results for the plate and wedge-cylinder are compared with those obtained by using the TDPO and finite difference time-domain(FDTD),which verify the validity and availability of this method.