多极化低频UWB SAR图像的失真补偿

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.

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

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.