低频UWB SAR定标体电磁散射建模  

Electromagnetic Scattering Model of Calibrators for Low Frequency UWB SAR System

作　　者：邹鲲[1] 何剑[2] 赵修斌[1] 吴德伟[1] 

机构地区：[1]空军工程大学电讯工程学院,西安710077 [2]西北工业大学电子信息学院,西安710072

出　　处：《微波学报》2007年第B08期168-171,共4页Journal of Microwaves

摘　　要：在进行低频超宽带合成孔径雷达(ultra wide band synthetic aperture radar,UWB SAR)校准过程中,常常需要使用各种定标体。定标体的散射特性表现为低频谐振散射,因此常规高频窄带SAR定标体散射模型不再适用。本文利用矩量法(Method of Moment,MOM)计算指定频率点和入射角度的目标散射特性,利用渐近波形估计(asymptotic waveform evaluation,AWE)技术获得超宽带和宽角度的目标散射特性,并根据SAR的几何模型,给出了目标散射特性随目标视角和频率的变化关系。During the procedure of calibration for low frequency ultra wide band synthetic aperture radar （UWB SAR）, the various calibrators are needed. The electromagnetic scattering models of calibrators are resonance scattering, as result, the scattering model of the calibrators for regular high frequency and narrow band SAR system cannot be used here. The scattering of the calibrators at a given frequency point and incident angle can be calculated using method of moment （MOM）, and the scattering of the calibrator at the ultra wideband and various incident angle can be calculated using asymptotic waveform evaluation （AWE） technique. The electromagnetic scattering models of calibrators are given by using the geometric relationship of the UWB SAR system.

关 键 词：低频UWBSAR 矩量法 渐近波形估计 

分 类 号：TN958[电子电信—信号与信息处理] TN011[电子电信—信息与通信工程]