| 相位梯度自聚焦算法的性能分析及改进 |
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| 引用本文： | 陈琦,李景文.相位梯度自聚焦算法的性能分析及改进[J].北京航空航天大学学报,2004,30(2):131-134. |
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| 作者姓名： | 陈琦 李景文 |
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| 作者单位： | 北京航空航天大学 电子信息工程学院, 北京 100083 |
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| 摘 要： | 描述了相位梯度自聚焦(PGA)算法的实现步骤.基于对PGA算法的性能分析及对PGA算法的基本步骤所起作用的研究,提出了两种改进的方法.首先,通过对加窗方法的改进,提高了算法的聚焦速度;另外,通过选择适当的距离行进行处理,使算法即使在低信噪比的条件下也能达到较好的聚焦效果.
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| 关 键 词： | 合成孔径雷达 相位误差 相位梯度自聚焦 |
| 文章编号： | 1001-5965(2004)02-0131-04 |
| 收稿时间： | 2002-09-28 |
| 修稿时间： | 2002年9月28日 |
Performance analysis and improvement of phase gradient autofocus algorithm |
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| Chen Qi,Li Jingwen.Performance analysis and improvement of phase gradient autofocus algorithm[J].Journal of Beijing University of Aeronautics and Astronautics,2004,30(2):131-134. |
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| Authors: | Chen Qi Li Jingwen |
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| Institution: | School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China |
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| Abstract: | The realization of phase gradient autofocus (PGA) algorithm was described. Based on the analysis of the shortcoming of PGA and the study of the roles of the basic steps of phase gradient autofocus algorithm, two methods were proposed to improve the performance of the PGA algorithm. First, a new way to select window width was developed, which can accelerate the convergence of the autofocus; second, by selecting the appropriate row to processing, the effect of convergence of focus is good even under the condition of low SNR(signal to noise rate). |
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| Keywords: | synthetic aperture radar phase errors phase gradient autofocus |
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