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大斜视角与大波束角SAR成像比较
引用本文:王亮,练有品,黄晓涛,周智敏. 大斜视角与大波束角SAR成像比较[J]. 电子学报, 2006, 34(9): 1672-1676
作者姓名:王亮  练有品  黄晓涛  周智敏
作者单位:国防科学技术大学电子科学与工程学院,湖南长沙,410073;后勤工程学院后勤信息工程系,重庆,400016
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.

关 键 词:SAR成像  二维频域耦合  非线性CS算法
文章编号:0372-2112(2006)09-1672-05
收稿时间:2005-07-20
修稿时间:2005-07-202005-12-20

Comparison of Large-Squint and Large-Beamwidth SAR Imaging
WANG Liang,LIAN You-ping,HUANG Xiao-tao,ZHOU Zhi-min. Comparison of Large-Squint and Large-Beamwidth SAR Imaging[J]. Acta Electronica Sinica, 2006, 34(9): 1672-1676
Authors:WANG Liang  LIAN You-ping  HUANG Xiao-tao  ZHOU Zhi-min
Affiliation:1. Dept.of Electronic Technology,NUDT,Changsha,Hunan 410073,China;2. Dept.of Logistics Information Engineering,LEU,Chongqing 400016,China
Abstract: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.
Keywords:SAR image formation   two-dimension spectrum coupling    nonlinear chirp-scaling algorithm
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