Journal of University of Chinese Academy of Sciences >
Deramp chirp scaling algorithm for high squint spotlight SAR
Received date: 2009-11-18
Revised date: 2010-01-06
Online published: 2010-05-15
The Doppler bandwidth of spotlight SAR is usually larger than the PRF of azimuth signal. To avoid azimuth spectral folding, the improved algorithm first carries out deramp processing, and then uses CS algorithm to achieve accurate focus. Before the range compression, the improved algorithm completes cubic and quartic phase compensation. The improved DCS algorithm can not only achieve fine focusing images, but also remove the dissymmetric phenomena in the range compressed signal. Based on the squint spotlight model, the detailed derivation of the improved algorithm was presented. Simulation results show that the improved algorithm can be used for high squint spotlight SAR imaging.
Key words： spotlight SAR; deramp processing; phase compensation
LIU Han-Yan , WU Yong , SONG Hong-Jun . Deramp chirp scaling algorithm for high squint spotlight SAR[J]. Journal of University of Chinese Academy of Sciences, 2010 , 27(3) : 381 -388 . DOI: 10.7523/j.issn.2095-6134.2010.3.012
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