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.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2006年第9期1672-1676,共5页
Acta Electronica Sinica
基金
国防预研项目(No.408010202)
关键词
SAR成像
二维频域耦合
非线性CS算法
SAR image formation
two-dimension spectrum coupling
nonlinear chirp-scaling algorithm
