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| A Two Dimensional Autofocus Translation Compensation Method for Wide-angle ISAR Imaging |
| FU Jixiang SUN Guangcai XING Mengdao |
(National Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, China)
(Collaborative Innovation Center of Information Sensing and Understand, Xidian University, Xi’an 710071, China) |
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Abstract For non-cooperative ISAR targets, the rotation motion and the translation motion are coupled under wide-angle circumstance, and it is hard to compensate the translation motion precisely. A two dimensional autofocus translation compensation method for wide-angle ISAR imaging is proposed. Firstly, the translation motion is compensated coarsely; then, two dimensional coupling between rotation and translation is decoupled through Polar Format Algorithm (PFA); finally, the error phase is extracted by autofocus algorithm and then the residual translation is estimated from the error phase. The proposed method can correct the envelope and phase errors simultaneously, and compared with traditional translation compensation methods, range alignment combining with autofocus, the proposed method has a higher precision; compared with the methods of optimization for jointing alignment and phase, the proposed method is more efficient. The experimental results using both simulated data and measured data collected in microwave chamber confirm the validation and practicality of the proposed algorithm.
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Received: 07 April 2017
Published: 28 August 2017
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| Fund:The Major Research Plan of the National Natural Science Foundation of China (91438106), The Foundation for Innovative Research Groups of the National Natural Science Foundation of China (61621005) |
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Corresponding Authors:
FU Jixiang
E-mail: jixiang_xd@126.com
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| [1] |
吴敏, 张磊, 刘松杨, 等. OFDM-ISAR的稀疏优化成像与运动补偿[J]. 雷达学报, 2016, (1): 72-81. doi: 10.12000/JR 16017.
|
|
WU Min, ZHANG Lei, LIU Songyang, et al. OFDM-ISAR Sparse Optimization Imaging and Motion Compensation[J]. Journal of Radars, 2016, 5(1): 72-81. doi: 10.12000/JR16017.
|
| [2] |
陈文峰, 李少东, 杨军, 等. 基于线性Bregman迭代类的多量测向量ISAR成像算法研究[J]. 雷达学报, 2016, 5(4): 389-401. doi: 10.12000/JR16057.
|
|
CHEN Wenfeng, LI Shaodong, YANG Jun, et al. Multiple Measurement Vectors ISAR Imaging Algorithm Based on a Class of Linearized Bregman Iteration[J]. Journal of Radars, 2016, 5(4): 389-401. doi: 10.12000/JR16057.
|
| [3] |
LI Chenchen J and LING Hao. Wide-angle ISAR imaging of vehicles[C]. 2015 9th European Conference on Antennas and Propagation (EuCAP), Lisbon, Portugal, 2015: 1-2.
|
| [4] |
CHEN Chungching and ANDREWA Harry C. Target- motion-induced radar imaging[J]. IEEE Transactions on Aerospace and Electronic Systems, 1980, 16(1): 2-14. doi: 10.1109/TAES.1980.308873.
|
| [5] |
ZHENG Jibin, SU Tao, ZHU Wentao, et al. ISAR imaging of targets with complex motions based on the keystone time-chirp rate distribution[J]. IEEE Transactions on Geoscience and Remote Sensing Letters, 2014, 11(7): 1275-1279. doi: 10.1109/LGRS.2013.2291992.
|
| [6] |
RUAN Huang, WU Yanhong, JIA Xin, et al. Novel ISAR imaging algorithm for maneuvering targets based on a modified keystone transform[J]. IEEE Transactions on Geoscience and Remote Sensing Letters, 2014, 11(1): 128-132. doi: 10.1109/LGRS.2013.2250250.
|
| [7] |
LI Xiaolong, CUI Guolong, YI Wei, et al. Range migration correction for maneuvering target based on generalized keystone transform[C]. 2015 IEEE International Radar Conference (RadarCon), Arlington, VA, USA, 2015: 0095-0099. doi: 10.1109/RADAR.2015.7130977.
|
| [8] |
LIU Yiu, XU Shiyou, CHEN Zengping, et al. MTRC compensation in high-resolution ISAR imaging via improved polar format algorithm based on ICPF[J]. EURASIP Journal on Advances in Signal Processing, 2014, 2014(1): 1-17. doi: 10.1186/1687-6180-2014-179.
|
| [9] |
ZHU Daiyin, WANG Ling, YU Yusheng, et al. Robust ISAR range alignment via minimizing the entropy of the average range profile[J]. IEEE Transactions on Geoscience and Remote Sensing Letters, 2009, 6(4): 204-208. doi: 10.1109/ LGRS.2008.2010562.
|
| [10] |
PENG Shibao, XU Jia, WANG Libao et al. A new ISAR range alignment method based on particle swarm optimizer[C]. 2009 IEEE 2nd Asian-Pacific. Conference. Synth. Aperture Radar (APSAR’09), Xi’an, China, 2009: 618-621. doi: 10.1109/APSAR.2009.5374278.
|
| [11] |
徐刚, 杨磊, 张磊, 等. 一种加权最小熵的 ISAR 自聚焦算法[J]. 电子与信息学报, 2011, 33(8): 1809-1815. doi: 10.3724/ SP.J.1146.2010.01153.
|
|
XU Gang, YANG Lei, ZHANG Lei, et al. Weighted minimum entropy autofocus algorithm for ISAR imaging[J]. Journal of Electronics & Information Technology, 2011, 33(8): 1809-1815. doi: 10.3724/SP.J.1146.2010.01153.
|
| [12] |
杨磊, 熊涛, 张磊, 等. 应用联合自聚焦实现低信噪比 ISAR 成像平动补偿[J]. 西安电子科技大学学报, 2012, 39(3): 63-71. doi: 10.3969/j.issn.1001-2400.2012.03.010.
|
|
YANG Lei, XIONG Tao, ZHANG Lei, et al. Translational motion compensation for ISAR imaging based on joint autofocusing under the low SNR[J]. Journal of Xidian University, 2012, 39(3): 63-71. doi: 10.3969/j.issn.1001-2400. 2012.03.010.
|
| [13] |
ZHANG Lei, SHENG Jialian, DUAN Jia, et al. Translational motion compensation for ISAR imaging under low SNR by minimum entropy[J]. EURASIP Journal on Advances in Signal Processing, 2013, 2013(1): 1-19. doi: 10.1186/1687- 6180-2013-33.
|
| [14] |
LIU Lei, ZHOU Feng, TAO Mingliang, et al. Adaptive translational motion compensation method for ISAR imaging under low SNR based on particle swarm optimization[J]. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2015, 8(11): 5146-5157. doi: 10.1109/JSTARS.2015.2491307.
|
| [15] |
NOVIELLO C, FORNARO G, BRACE P, et al. Fast and accurate ISAR focusing based on a Doppler parameter estimation algorithm[J]. IEEE Geoscience and Remote Sensing Letters, 2017, 14(3): 349-353. doi: 10.1109/LGRS. 2016.2641498.
|
| [16] |
YANG Lei, XING Mengdao, WANG Yong, et al. Compensation for the NsRCM and phase error after polar format resampling for airborne spotlight SAR raw data of high resolution[J]. IEEE Transactions on Geoscience and Remote Sensing Letters, 2013, 10(1): 165-169. doi: 10.1109/ LGRS.2012.2196676.
|
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