时域物理光学法分析均匀介质目标的瞬态散射  

Transient scattering analysis of electrically large homogeneous dielectric targets by using TDPO method

作　　者：关莹[1] 龚书喜[1] 张帅[1] 洪涛[1] 

机构地区：[1]西安电子科技大学天线与微波技术国防科技重点实验室,陕西西安710071

出　　处：《电波科学学报》2011年第3期515-520,共6页Chinese Journal of Radio Science

基　　金：国家自然科学基金(60801042)

摘　　要：提出将时域物理光学法(TDPO)应用于计算电大均匀介质目标的时域散射场。将菲涅尔反射系数应用到频域物理光学近似中,由逆傅里叶变换推导出介质TDPO的表达式,从而使TDPO能够分析电大均匀介质目标的瞬态响应。同时给出了三角面片建模下入射波的遮挡消隐方法。计算了典型目标的瞬态散射响应和宽带雷达散射截面(RCS),与其他方法求得的结果吻合良好,验证了介质TDPO的正确性。The dielectric time-domain physical optics （TDPO） is proposed to calcu- late the time-domain scattered field of electrically large homogeneous dielectric tar- gets. The Fresnel reflection coefficients are applied to the frequency-domain physi- cal optics （PO） approximation, and formulae of the dielectric TDPO are derived through the inverse Fourier transform. Thus the conventional TDPO is extended to analyze the homogeneous dielectric objects. The technique for shadowing is dis- cussed when the target is modeled with triangular facets. The transient scattering and wideband radar cross section （RCS） of several examples are given, of which re- sults agree well with those obtained by other methods, which demonstrates the va- lidity of the dielectric TDPO.

关 键 词：均匀介质目标 时域物理光学法 瞬态散射 宽带雷达散射截面 

分 类 号：TN821.8[电子电信—信息与通信工程]