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 引用本文: 马仑, 廖桂生. 一种基于DCT的SAR图像自聚焦算法[J]. 北京航空航天大学学报, 2006, 32(04): 417-420.
Ma Lun, Liao Guisheng. Novel autofocus algorithm based on DCT for SAR images[J]. Journal of Beijing University of Aeronautics and Astronautics, 2006, 32(04): 417-420. (in Chinese)
 Citation: Ma Lun, Liao Guisheng. Novel autofocus algorithm based on DCT for SAR images[J]. Journal of Beijing University of Aeronautics and Astronautics, 2006, 32(04): 417-420. (in Chinese)

## 一种基于DCT的SAR图像自聚焦算法

• 中图分类号: TN 957

## Novel autofocus algorithm based on DCT for SAR images

• 摘要: 研究了一种基于离散余弦变换(DCT, Discrete Cosine Transform)的SAR(Synthetic Aperture Radar)图像自聚焦算法.该方法从复图像域出发,通过在距离压缩相位历史域引入相位误差模型,改变图像的聚焦程度直至一维像的DCT序列在高序数区域的权值达到最大,从而完成误差校正.同相位梯度自聚焦算法相比,该方法无需在图像域分离出强点目标,因此特别适用于无任何明显特征的图像.由于DCT存在快速算法,使得该自聚焦算法计算量较少,更易实现.实测数据及仿真数据的成像结果证明了此方法的可行性.

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##### 出版历程
• 收稿日期:  2005-04-11
• 刊出日期:  2006-04-30

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