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�������պ����ѧѧ�� 2006, Vol. 32 Issue (04) :417-420    DOI:
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Novel autofocus algorithm based on DCT for SAR images
Ma Lun, Liao Guisheng*
Key Laboratory for Radar Signal Processing, Xidian University, Xi’an 710071, China

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ժҪ �о���һ�ֻ�����ɢ���ұ任(DCT, Discrete Cosine Transform)��SAR(Synthetic Aperture Radar)ͼ���Ծ۽��㷨.�÷����Ӹ�ͼ�������,ͨ���ھ���ѹ����λ��ʷ��������λ���ģ��,�ı�ͼ��ľ۽��̶�ֱ��һά���DCT�����ڸ����������Ȩֵ�ﵽ���,�Ӷ�������У��.ͬ��λ�ݶ��Ծ۽��㷨���,�÷���������ͼ��������ǿ��Ŀ��,����ر����������κ�����������ͼ��.����DCT���ڿ����㷨,ʹ�ø��Ծ۽��㷨����������,����ʵ��.ʵ�����ݼ��������ݵij�����֤���˴˷����Ŀ�����.
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Abstract�� A novel autofocus algorithm for SAR(synthetic aperture radar) images is presented, which is based on DCT(discrete cosine transform). The method, which starts with complex phase-degraded SAR image, after phase errors model is introduced into the range-compressed phase-history domain, carries out phase errors correction by changing the focus until the intensity of the weight function of the azimuth profile in the area of high sequencies is maximized. Compared with the PGA autofocus algorithm, this autofocus algorithm needs not isolate prominent point target in image domain and is especially suitable for the images without specific characteristic. This autofocus algorithm is of less computational complexity and easy to implement, because there are fast algorithms for DCT. The simulation and the processing results of the measured data show the validity of the proposed method.
Keywords�� SAR(synthetic aperture radar)   DCT(discrete cosine transform)   autofocus   phase errors     
Received 2005-04-11;
About author: �� ��(1981-),��,������,��ʿ��, lunma@126.com.
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����, �ι���.һ�ֻ���DCT��SARͼ���Ծ۽��㷨[J]  �������պ����ѧѧ��, 2006,V32(04): 417-420
Ma Lun, Liao Guisheng.Novel autofocus algorithm based on DCT for SAR images[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2006,V32(04): 417-420
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http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2006/V32/I04/417
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