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| A subaperture imaging approach of spaceborne spotlight SAR |
| Wang Guodong; Zhou Yinqing; Li Chunsheng |
| Dept. of Electron. Eng., Beijing Univ. of Aeronautics & Astronautics Beijing 100083 China |
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Abstract Signal properties of spaceborne spotlight SAR. arc; discussed. Based on the analyses of a few .spotlight imaging algorithm, a modified chirp scaling algorithm for spaceborne spotlight SAR is proposed. Besides, a subaperture method is combined with the algorithm. In order to resolve high Pulse Repetition Frequency (PR.F) and the time-variant of Doppler center frequency, etc., the necessity and implementation approach of the subaperture method are analyzed thoroughly. The validity of the proposed method is tested by computer simulation.
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Received: 22 July 2001
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2003, Vol. 25 
