收稿日期: 2009-11-18
修回日期: 2010-01-06
网络出版日期: 2010-05-15
Deramp chirp scaling algorithm for high squint spotlight SAR
Received date: 2009-11-18
Revised date: 2010-01-06
Online published: 2010-05-15
刘寒艳 , 吴勇 , 宋红军 . 斜视聚束模式下的DCS算法[J]. 中国科学院大学学报, 2010 , 27(3) : 381 -388 . DOI: 10.7523/j.issn.2095-6134.2010.3.012
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
[1] Garrara W G, Goodman R S, Majewski R M.Spotlight synthetic aperture radar
[M].Boston Artech House, 1995.
[2] 保 铮, 邢孟道, 王 彤. 雷达成像技术
[M]. 北京: 电子工业出版社, 2005: 151-157.
[3] Lanari R, Tesauro M, Sansosti E, et al. Spotlight SAR data focusing based on a two-step processing approach
[J]. IEEE Trans on Geosci Remote Sensing, 2001, 39(9): 1993-2004.
[4] Wang G D, Zhou Y Q, Li C S. A deramp chirp scaling algorithm for high-resolution spaceborne spotlight SAR imaging
[J]. Acta Electronica Sinica, 2003, 31 (12): 1784-1789(in Chinese). 王国栋, 周荫清, 李春升. 高分辨率星载聚束式SAR的Deramp Chirp Scaling成像算法
[J]. 电子学报, 2003, 31 (12): 1784-1789.
[5] Jin L H, Liu X Z. Nonlinear frequency scaling algorithm for high squint spotlight SAR data processing
[J]. EURASIP Journal on Advances in Signal Processing, 2008, 2008(657081): 1-8.
[6] Davison G W, Cumming I G. A chirp scaling approach for processing squint mode SAR data
[J]. IEEE Trans on AES, 1996, 32(1): 121-133.
[7] Chen Q, Yang R L. Study on systems of airborne squint mode and forward looking mode synthetic aperture radar . Beijing: Institute of Electronics, Chinese Academy of Sciences, 2004(in Chinese). 陈 琦, 杨汝良. 机载斜视及前视合成孔径雷达系统研究 . 北京: 中国科学院电子学研究所, 2004.
[8] Guo L, Xing M D, Tang Y, et al. A novel modified omega-K algorithm for synthetic aperture imaging lidar through the atmosphere
[J]. Sensors, 2008, 8(5): 3056-3066.
[9] Jing W, Zhang L, Xing M D, et al. Algorithm for wide-swath spotlight SAR data processing
[J]. Acta Electronica Sinica, 2009, 37(3): 470-475(in Chinese). 井 伟, 张 磊, 邢孟道,等. 聚束SAR的宽场景成像算法
[J]. 电子学报, 2009, 37(3): 470-475.
[10] Gu Y, Li C S, Chen J, et al. The Realization of Image Formation Algorithm for High Resolution Spaceborne Spotlight SAR
[J]. Journal of Astronautics, 2005, 26(Sup): 87-92(in Chinese). 顾 毅, 李春升, 陈 杰,等. 高分辨率星载聚束式SAR成像处理实现方法
[J]. 宇航学报, 2005, 26(Sup): 87-92.
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