穿透叶簇UWB雷达人造目标简化电磁模型  

Simplified EM Modeling for FOPEN UWB SAR Man-Made Target

作　　者：蒋咏梅[1] 梁甸农[1] 

机构地区：[1]国防科技大学电子工程学院,长沙410073

出　　处：《微波学报》2000年第5期561-572,共12页Journal of Microwaves

摘　　要：穿透叶簇的 VHF/ UHF超宽带 ( UWB) SAR具有相对带宽很宽 ,积累角大的特点 ,可同时获得距离、方位的高分辨能力 ,能用于探测叶簇隐蔽的军用车辆等人造目标而有着重要的军事应用价值。在 VHF/ U HF低频段 ,一般的人造目标可简单模化为目标主侧面与地表面之间形成的直二面角。本文详细推导了二面角人造目标光学区的散射场 ,建立了低频 UWB雷达人造目标的光学区简化电磁模型 ,进而分析预测了二面角目标的散射特性。预测结果与外场试验分析得到的目标特性之间的一致性表明本文所建立的电磁模型是正确合理的。FOliage PENetrating (FOPEN) VHF/UHF Ultra-WideBand (UWB) SAR can image hidden man-made targets with wide-angle and ultra-wide bandwidth to achieve both range and azimuth high resolutions, which is valuble for military application. The common target (such as military vehicle) can be modeled by dihedral formed between its sides and ground due to the long wavelength of VHF/UHF. In this paper, formulas are deduced in detail for the backscattered E-field of a perfectly conducting dihedral object in the optics scattering region. Utilizing the developed electromagnetic scattering model for dihedral object, the scattering properties of man-made objects are predicted. The obtained simple EM model is proved to be correct by the consistent properties of man-made objects between the predicted ones and those which derived from foliage penetrating experimental data.

关 键 词：超宽带雷达 合成孔径雷达 二面角人造目标 电磁模型 

分 类 号：TN95[电子电信—信号与信息处理]