大斜视角与大波束角SAR成像比较  

Comparison of Large-Squint and Large-Beam width SAR Imaging

作　　者：王亮[1] 练有品[2] 黄晓涛[1] 周智敏[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073 [2]后勤工程学院后勤信息工程系,重庆400016

出　　处：《电子学报》2006年第9期1672-1676,共5页Acta Electronica Sinica

基　　金：国防预研项目(No.408010202)

摘　　要：大斜视角与大波束角SAR(Synthetic Aperture Radar)成像中都要处理强耦合的回波信号,获得聚焦性能良好的图像更加困难.本文利用SAR回波的二维频谱表达式,比较了在两种SAR成像中耦合项的来源和耦合程度,通过分析非线性Chirp Scaling算法中的解耦合方法,得出了残余耦合与成像测绘带宽、目标最远距离的关系,并利用这两个指标评价了非线性Chirp Scaling算法应用于大斜视角和大波束角SAR成像的差异.In image formation of large-squint and large-beamwidth SAR, a high coupling and range-variant migration echo must be processed so that it is difficult to get a fine focusing synthetic aperture radar （SAR） image. In this paper, we first compared about the source and degree of the coupling in those two models by the mathematical two-dimension spectrum expression of SAR echoes. Next, we mainly discuss the method of uncoupling in the nonlinear chirp-scaling algorithm and attain a relation of residual coupling and two parameters, which is mapping slant-range width and most far slant-range distance. Finally, we give the difference of those two parameters when that algorithm is used to large-squint and large-beam width SAR image formation.

关 键 词：SAR成像 二维频域耦合 非线性CS算法 

分 类 号：TN957[电子电信—信号与信息处理]