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�������պ����ѧѧ�� 2009, Vol. 35 Issue (9) :1156-1160    DOI:
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�� Ȼ, ���, ������*
�������պ����ѧ ������Ϣ����ѧԺ, ���� 100191
Improved ECS algorithm for spaceborne spotlight SAR based on deramp processing
Li Ran, Li Jingwen, Li Linlin*
School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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ժҪ �������������㷨��ECS(Extended Chirp Scaling)�����㷨,���һ�ֽ��DerampԤ��������ؾ���ʽSAR(Synthetic Aperture Radar)�Ľ���ECS�����㷨.DerampԤ�����ǻ���SPECAN�㷨��˼��,���ź�ͨ���ǿձ�ķ�λ�˲���ʵ����ѹ��,�÷����ڱ�֤����ֱ��ʵ�ǰ����,ͨ��deramp�����������ɲ����ʲ��㵼�µķ�λƵ�׻���ر���������SAR�߷ֱ��ʾ���ģʽ��.����ECS�㷨�е��ӿ׾�������Խ��Ͷ�ϵͳ�����ظ�Ƶ�ʵ�Ҫ��,���������ظ�Ƶ����Ȼ�ܵ���������մ��������.�����ܵķ������Խ�һ������ECS�㷨���ӿ׾��ָ��������ظ�Ƶ�ʵ�Ҫ��,ʹ��ECS���㷨��Ӧ�ø�Ϊ�㷺.ͨ���Ե�Ŀ����з���ͳ���,����ָ��������֤�˸��㷨�Ŀ�����.
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Abstract�� Based on the two-step imaging algorithm and the extended chirp scaling (ECS) algorithm,an approach for spotlight mode of spaceborne synthetic aperture radar(SAR), which combines the deramp processing and ECS algorithm was proposed. The deramp processing is based on SPECAN algorithm, and passes the raw data through a space invariant azimuth matched filter. The azimuthal spectral folding caused by insufficient sampling rate especially in high resolution spaceborne spotlight SAR was overcomed through the deramp processing. Although the division into subappertures in ECS can reduce the system requirement of the pulse repetition frequency(PRF), the PRF is restricted to higher than the accumulated doppler frequency bandwidth of a single point target. The presented method further reduces the requirement of the PRF in subapperture processing without the resolution loss. Thereby the ECS algotithm can be applied easily. The simulating and imaging results of point targets demonstrate the validity of this approach.
Keywords�� spotlight mode   extended chirp scaling   synthetic aperture radar   imaging algorithm     
Received 2008-09-16;
About author: �� Ȼ(1984-),��,ɽ����˳��,��ʿ��,lir@ee.buaa.edu.cn.
�� Ȼ, ���, ������.����deramp�����ؾ���ʽSAR�Ľ�ECS�㷨[J]  �������պ����ѧѧ��, 2009,V35(9): 1156-1160
Li Ran, Li Jingwen, Li Linlin.Improved ECS algorithm for spaceborne spotlight SAR based on deramp processing[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2009,V35(9): 1156-1160
http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2009/V35/I9/1156
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