| 斜视聚束模式下的DCS算法 |
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| 作者姓名： | 刘寒艳 吴勇 宋红军 |
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| 作者单位： | 1. 中国科学院电子学研究所,北京 100190;
2. 中国科学院研究生院,北京 100049 |
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| 摘 要： | 聚束SAR回波的多普勒带宽通常大于方位向采样率. 为避免方位频谱混叠,首先进行方位deramp消除频谱混叠,然后利用CS算法进行精确聚焦.在距离压缩前增加了距离频率3次和4次相位补偿,通过分析仿真结果发现该算法不仅能在大斜视下取得良好的聚焦图像,而且还能消除原DCS算法存在的距离压缩信号左右旁瓣不对称现象.基于斜视聚束模型,给出了一种改进的DCS算法的详细推导过程. 仿真结果表明,该算法可用于大斜视聚束SAR成像处理.
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| 关 键 词： | 聚束SAR deramp处理 相位补偿 |
| 收稿时间： | 2009-11-18 |
| 修稿时间： | 2010-01-06 |
Deramp chirp scaling algorithm for high squint spotlight SAR |
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| Authors: | LIU Han-Yan WU Yong SONG Hong-Jun |
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| Institution: | 1. Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;
2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The Doppler bandwidth of spotlight SAR is usually larger than the PRF of azimuth signal. To avoid azimuth spectral folding, the improved algorithm first carries out deramp processing, and then uses CS algorithm to achieve accurate focus. Before the range compression, the improved algorithm completes cubic and quartic phase compensation. The improved DCS algorithm can not only achieve fine focusing images, but also remove the dissymmetric phenomena in the range compressed signal. Based on the squint spotlight model, the detailed derivation of the improved algorithm was presented. Simulation results show that the improved algorithm can be used for high squint spotlight SAR imaging. |
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| Keywords: | spotlight SAR deramp processing phase compensation |
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