Modified Omega-K algorithm for sub-aperture high squint SAR imaging based on azimuth resampling

被引：0
作者：
Huai, Yuan-Yuan [1 ]
Liang, Yi [1 ]
Li, Zhen-Yu [1 ]
Xing, Meng-Dao [1 ]
机构：
[1] National Key Laboratory of Radar Signal Processing, Xidian University, Xi'an
来源：
Dianzi Yu Xinxi Xuebao/Journal of Electronics and Information Technology | 2015年 / 37卷 / 07期
关键词：
Azimuth resampling; High squint; Modified Omega-K algorithm; SAR imaging; Sub-aperture;
D O I：
10.11999/JEIT141383
中图分类号：
学科分类号：
摘要：
Due to the skew Region Of Support (ROS) of the two-dimensional wavenumber domain for high squint SAR data, conventional Omega-K algorithm can not exploit the ROS efficiently enough and degrades the resolution when choosing the square region to process. So a modified Omega-K algorithm is proposed in this paper to deal with the high squint SAR data for sub-aperture imaging. The maximum usage of ROS is obtained by the coordinate axis rotation. For the following azimuth dependence, the method of azimuth resampling is adopted to realize the uniform focusing. Compared with the traditional Omega-K method, the modified Omega-K algorithm is focused in azimuth wavenumber-domain because of the limitation of the azimuth sub-aperture ROS in order to avoid zero padding operation, and increase efficiency. Simulation results and raw data processing validate the effectiveness of the proposed algorithm. ©, 2015, Science Press. All right reserved.
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页码：1743 / 1750
页数：7
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