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�������պ����ѧѧ�� 2004, Vol. 30 Issue (02) :131-134    DOI:
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Performance analysis and improvement of phase gradient autofocus algorithm
Chen Qi, Li Jingwen*
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).
Keywords�� synthetic aperture radar   phase errors   phase gradient autofocus     
Received 2002-09-28;


About author: �� ��(1978-),��,����DZ����,˶ʿ��, lijingwen@buaa.edu.cn.
����, ���.��λ�ݶ��Ծ۽��㷨�����ܷ������Ľ�[J]  �������պ����ѧѧ��, 2004,V30(02): 131-134
Chen Qi, Li Jingwen.Performance analysis and improvement of phase gradient autofocus algorithm[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2004,V30(02): 131-134
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