基于时域物理光学法的涂覆目标瞬态散射分析  

The Analysis of Transient Scattering from Coated Target Based on Time-Domain Physical Optics Method

作　　者：武光辉[1] 童创明[1,2] 李西敏[1] 苏文然[1] 肖军[1] WU Guang-hui TONG Chuang-ming LI Xi-min SU Wen-ran XIAO Jun(Air and Missile Defense College, Air Force Engineering University, Xi＇ an 710051, China State Key Laboratory of Millimeter Waves, Nanjing 210096, China)

机构地区：[1]空军工程大学防空反导学院,西安710051 [2]毫米波国家重点实验室,南京210096

出　　处：《微波学报》2016年第5期6-9,14,共5页Journal of Microwaves

基　　金：国家自然科学基金(61372033);航空科学基金资助项目(20130196005)

摘　　要：为了对涂覆雷达吸波材料(RAM)的电大尺寸目标的时域瞬态散射特性和宽带RCS进行快速计算,以满足工程上对目标电磁散射特性的计算向宽频带、向时域靠拢的需求。通过引入阻抗边界条件(IBC),计算了涂覆RAM目标表面的等效反射系数,将等效反射系数代入频域物理光学法(PO)的表达式,并进行逆傅里叶变换(IFT),推导出了适用于涂覆RAM的目标的时域物理光学法(TDPO)积分表达式。使用OpenGL控制图形处理器(GPU)来对目标的面元模型进行消隐处理,提高了运算速度。最后通过两个仿真算例,对TDPO与频域PO计算所得的时域瞬态响应和宽带RCS进行对比,验证了TDPO计算结果与频域PO计算结果具有同等精度。A new approach is proposed to accelerate the calculation of the transient scattering and wide-band RCS from electrically large target coated with radar absorption material（ RAM）,and to meet the engineering requirements of obtaining the scattering characteristics in wide-band and time domain. The equivalent complex reflection coefficient of RAM-coated target is calculated by introducing the impedance boundary conditions（ IBC）. With the substitution of the equivalent complex reflection coefficient for frequency-domain physical optics（ PO）,the integral expression of the time-domain physical optics（ TDPO） is obtained by implementing the inverse Fourier transformation（ IFT）,which is suitable for RAM-coated target.The Graphics Processing Unit（ GPU） is driven to accelerate the shadowing processing of the facet target model by the OpenGL. With the comparisons of the transient scattering and wide-band RCS between TDPO and frequency-PO,TDPO is proved to have the same accuracy as frequency-PO.

关 键 词：宽带RCS 瞬态散射 涂覆目标 时域物理光学 OPENGL 

分 类 号：O436[机械工程—光学工程]