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采用双基地逆合成孔径雷达距离-多普勒算法成像时, 目标尺寸较大或累积转角过大, 会引起越分辨单元徙动现象, 影响成像质量. 针对双基地角时变下逆合成孔径雷达成像的越分辨单元徙动问题, 提出了一种校正算法. 首先, 建立了双基地逆合成孔径雷达回波模型, 分析了越分辨单元徙动的产生机理, 并通过广义的Keystone变换实现了越距离单元徙动的校正, 同时消除了目标非匀速转动对成像的影响. 然后, 基于图像对比度最大准则估计了图像的等效旋转中心位置, 并对距离向绝对定标, 进而构造补偿相位项, 完成了越多普勒单元徙动的校正. 仿真实验结果表明, 此方法能够有效地校正双基地角时变下的越分辨单元徙动, 提高成像质量.
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关键词:
- 双基地逆合成孔径雷达 /
- 双基地角 /
- 越分辨单元徙动
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[14] Zhang L, Li H L, Qiao Z J, Xing M D, Bao Z 2013 IEEE Trans. Geosci. Remote Sens. Lett. 10 1394
[15] Horvath M S, Gorham L A, Rigling B D 2013 IEEE Trans. Aerosp. Electron. Syst. 49 1402
[16] Wang Y, Li J W, Chen J, Xu H P, Sun B 2014 IEEE Trans. Geosci. Remote Sens. 52 640
[17] Wang W Q, Cai J Y 2010 IEEE Antenn. Wireless Propag. Lett. 9 307
[18] López-Dekker P, Mallorquí J J, Serra-Morales P, Sanz-Maros J 2008 IEEE Trans. Geosci. Remote Sens. 46 3459
[19] Krieger G, de Zan F 2014 IEEE Trans. Geosci. Remote Sens. 52 1480
[20] Bao Z, Xing M D, Wang T 2010 Radar Imaging Technology (Beijing: Publishing House of Electronics Industry) pp243-249 (in Chinese) [保铮, 邢孟道, 王彤2010雷达成像技术(北京: 电子工业出版社)第243–249页]
[21] Ye C M, Xu J, Zuo Y, Peng Y N, Wang X T 2009 J. Tsinghua Univ. (Sci. Technol. Ed.) 49 1205 (in Chinese) [叶春茂, 许稼, 左渝, 彭应宁, 王秀坛 2009 清华大学学报 (自然科学版) 49 1205]
[22] Dong J, Shang C X, Gao M G 2012 J. Electron. Inform. Technol. 32 1855 (in Chinese) [董健, 尚朝轩, 高梅国 2012 电子与信息学报 32 1855]
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[1] Yang Z Q, Zhang Y S, Luo Y J 1998 Bistatic (Multistatic) Radar System (Beijing: Defense Industry Press) pp14, 15 (in Chinese) [杨振起, 张永顺, 骆永军1998双(多)基地雷达系统(北京: 国防工业出版社)第14, 15页]
[2] Ji W J, Tong C M 2013 Chin. Phys. B 22 020301
[3] Zhang Y M, Wang Y H, Zhao C F 2010 Chin. Phys. B 19 084103
[4] Ma C Z, Yeo T S, Guo Q, Wei P J 2012 IEEE Trans. Geosci. Remote Sens. 50 3859
[5] Peng S B, Xu J, Meng C Z, Yang J, Peng Y N 2013 IET International Radar Conference Xi'an, China, April 14-16, 2013 p1
[6] Bai X R, Zhou F, Xing M D, Bao Z 2010 IEEE Trans. Geosci. Remote Sens. Lett. 7 430
[7] Fabrice C, Ali K, Alexandre B 2006 IEEE Trans. Antenn. Propag. 54 3529
[8] Ma C, Gu H, Su W M, Li C Z 2014 Acta Phys. Sin. 63 028403 (in Chinese) [马超, 顾红, 苏卫民, 李传中 2014 物理学报 63 028403]
[9] Pan X Y, Wang W, Feng D J, Liu Y C, Fu Q X, Wang G Y 2014 IET Radar Sonar Navig. 8 173
[10] Zhu R F, Luo Y, Zhang Q 2011 Modern Radar 33 34 (in Chinese) [朱仁飞, 罗迎, 张群 2011 现代雷达 33 34]
[11] Xing M D, Wu R, Bao Z 2005 IEE Proc. Radar Sonar Navig. 152 58
[12] Zheng P, Jing X J, Sun S L, Huang H 2012 3rd IEEE International Conference on Network Infrastructure and Digital Content Beijing, China, September 21-23, 2012 p562
[13] Zhu X P, Zhang Q, Zhu R F 2009 2nd Asian-Pacific Conference on Synthetic Aperture Radar Xi'an, China, October 26-30, 2009 p977
[14] Zhang L, Li H L, Qiao Z J, Xing M D, Bao Z 2013 IEEE Trans. Geosci. Remote Sens. Lett. 10 1394
[15] Horvath M S, Gorham L A, Rigling B D 2013 IEEE Trans. Aerosp. Electron. Syst. 49 1402
[16] Wang Y, Li J W, Chen J, Xu H P, Sun B 2014 IEEE Trans. Geosci. Remote Sens. 52 640
[17] Wang W Q, Cai J Y 2010 IEEE Antenn. Wireless Propag. Lett. 9 307
[18] López-Dekker P, Mallorquí J J, Serra-Morales P, Sanz-Maros J 2008 IEEE Trans. Geosci. Remote Sens. 46 3459
[19] Krieger G, de Zan F 2014 IEEE Trans. Geosci. Remote Sens. 52 1480
[20] Bao Z, Xing M D, Wang T 2010 Radar Imaging Technology (Beijing: Publishing House of Electronics Industry) pp243-249 (in Chinese) [保铮, 邢孟道, 王彤2010雷达成像技术(北京: 电子工业出版社)第243–249页]
[21] Ye C M, Xu J, Zuo Y, Peng Y N, Wang X T 2009 J. Tsinghua Univ. (Sci. Technol. Ed.) 49 1205 (in Chinese) [叶春茂, 许稼, 左渝, 彭应宁, 王秀坛 2009 清华大学学报 (自然科学版) 49 1205]
[22] Dong J, Shang C X, Gao M G 2012 J. Electron. Inform. Technol. 32 1855 (in Chinese) [董健, 尚朝轩, 高梅国 2012 电子与信息学报 32 1855]
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