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基于Chirp_z變換與方位變標(biāo)地球同步軌道SAR成像算法

李財(cái)品 何明一

李財(cái)品, 何明一. 基于Chirp_z變換與方位變標(biāo)地球同步軌道SAR成像算法[J]. 電子與信息學(xué)報(bào), 2015, 37(7): 1736-1742. doi: 10.11999/JEIT141491
引用本文: 李財(cái)品, 何明一. 基于Chirp_z變換與方位變標(biāo)地球同步軌道SAR成像算法[J]. 電子與信息學(xué)報(bào), 2015, 37(7): 1736-1742. doi: 10.11999/JEIT141491
Li Cai-pin, He Ming-yi. Imaging Algorithm for Geosynchronous Orbit SAR Based on Chirp_z Transform and Azimuth Scaling[J]. Journal of Electronics & Information Technology, 2015, 37(7): 1736-1742. doi: 10.11999/JEIT141491
Citation: Li Cai-pin, He Ming-yi. Imaging Algorithm for Geosynchronous Orbit SAR Based on Chirp_z Transform and Azimuth Scaling[J]. Journal of Electronics & Information Technology, 2015, 37(7): 1736-1742. doi: 10.11999/JEIT141491

基于Chirp_z變換與方位變標(biāo)地球同步軌道SAR成像算法

doi: 10.11999/JEIT141491

Imaging Algorithm for Geosynchronous Orbit SAR Based on Chirp_z Transform and Azimuth Scaling

  • 摘要: 針對(duì)地球同步軌道合成孔徑雷達(dá)(GEO SAR)成像距離向處理復(fù)雜,方位向空變性強(qiáng)問題,該文提出一種基于Chirp_z變換與方位變標(biāo)的成像算法。首先在回波模型中考慮停-走-停假設(shè)帶來的相位誤差,然后給出目標(biāo)點(diǎn)的斜距表達(dá)式,并利用泰勒級(jí)數(shù)對(duì)斜距進(jìn)行了高階展開,通過級(jí)數(shù)反演法得到信號(hào)頻譜表達(dá)式,利用高效的Chirp_z變換校正距離走動(dòng),簡(jiǎn)化距離向處理,利用改進(jìn)的變標(biāo)因子校正方位向信號(hào)一次,二次,三次展開項(xiàng)系數(shù)線性時(shí)變性,并在方位頻域內(nèi)補(bǔ)償變標(biāo)操作引入的相位誤差。仿真結(jié)果表明該算法能夠?qū)崿F(xiàn)地球同步軌道SAR聚集成像。
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    Bao Min and Xing Meng-dao. Chirp scaling algorithm for GEO SAR based on fourth-order range equation[J]. Electronics Letters, 2012, 48(1): 56-57.
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    Sun Guang-cai, Xing Meng-dao, Wang Yong, et al.. A 2-D space-variant chirp scaling algorithm based on the RCM equalization and subband synthesis to process geosynchronous SAR data[J]. IEEE Transactions on Geoscience and Remote Sensing, 2014, 52(8): 4868-4880.
    Li Zhuo, Li Chun-sheng, Yu Ze, et al.. Back projection algorithm for high resolution GEO-SAR image formation[C]. Proceedings of IEEE Geoscience and Remote Sensing Symposium (IGARSS), Vancouver, Canada, 2011: 336-339.
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    黃麗佳, 胡東輝, 丁赤飚. 中高軌道SAR信號(hào)建模和成像方法研究[J]. 國(guó)外電子測(cè)量技術(shù), 2011, 30(6): 21-27.
    Huang Li-jia, Hu Dong-hui, and Ding Chi-biao. Study on signal modeling and imaging approach for medium- earth-orbit SAR[J]. Foreign Electronic Measurement Technology,?2011, 30(6): 21-27.
    周鵬, 周松, 熊濤等. 基于級(jí)數(shù)反演的彈載SAR下降段CZT成像算法[J]. 電子與信息學(xué)報(bào), 2010, 32(12): 2861-2867.
    Zhou Peng, Zhou Song, Xiong Tao, et al.. A chirp-z transform imaging algorithm for missile-borne SAR with diving maneuver based on the method of series reversion[J]. Journal of Electronics Information Technology, 2010, 32(12): 2861-2867.
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出版歷程
  • 收稿日期:  2014-11-26
  • 修回日期:  2015-03-25
  • 刊出日期:  2015-07-19

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