多极化低频UWB SAR图像的失真补偿  

Calibration of Multi-Polarization Low Frequency UWB SAR System Based on 2D Frequency Domain

作　　者：邹鲲[1] 梁甸农[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《雷达科学与技术》2005年第5期289-291,305,共4页Radar Science and Technology

摘　　要：多极化、低频、超宽带合成孔径雷达(UWB SAR)可以获得目标的多极化散射特性,并具有一定的叶簇穿透能力,是未来雷达技术发展的一个重要方向。为了获得较高的方位向分辨率,该系统通常具有较大的方位向处理角,因此天线方向图沿方位向的变化不能忽略。该系统的超宽带特性使得天线方向图随频率的变化也不能忽略。本文假定天线方向图完全已知,提出了多极化低频UWB SAR的系统模型,并在图像的变换域上实现对天线方向图的补偿。最后利用计算机仿真验证了该方法的有效性。Multi polarization low frequency ultra wide band synthetic aperture radar（UWB SAR） system, which can measure the multi-polarization scattering of targets and has the ability of foliage penetration, is one of the most important trends of the future radar technique. The system usually processes a large azimuth angle to achieve the higher cross-range resolution, as the result, the change of the antenna pattern with cross-range cannot be neglected. Also, the change of the antenna pattern with frequency should be considered for the UWB system. In this paper, with hypothesis of the antenna pattern be known, the multi-polarization low frequency UWB SAR system model is given. And the antenna pattern is compensated on the transform domain of the SAR images. The computer simulation validates the method in the end.

关 键 词：多极化 低频UWB SAR 天线方向图补偿 

分 类 号：TN958[电子电信—信号与信息处理]