| 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 |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《电子学报》浏览原始摘要信息 |
|
点击此处可从《电子学报》下载免费的PDF全文 |
|
