Focusing and Parameter Estimation of Fluctuating Targets in High Resolution Spaceborne SAR
Wen Xuejiao①②③* Qiu Xiaolan①② You Hongjian①② Lu Xiaojun④
①(Key Laboratory of Geo-spatial Information Processing and Application System Technology, Beijing 100190, China) ②(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China) ③(University of Chinese Academy of Sciences, Beijing 100049, China) ④(China International Engineering Consulting Corporation, Beijing 100048, China)
Complex motion can cause serious defocusing phenomena in high resolution spaceborne SAR cases, which then lead to decreased image resolution. In this study, we built a simulation model to quantitatively analyze the signature and effect on maritime fluctuating targets in high resolution cases. To deal with formed Single-Look Complex (SLC) SAR images containing fluctuating targets, we implement a motion-compensation and fine-focusing method to obtain refocused images and the fluctuation parameters. We demonstrate the effectiveness and correctness of the proposed approach in focusing and estimating the parameters of fluctuating targets by processing the simulation results and archived images acquired by Terra-SAR in hybrid spotlight mode.
温雪娇, 仇晓兰, 尤红建, 卢晓军. 高分辨率星载SAR起伏运动目标精细聚焦与参数估计方法[J]. 雷达学报, 2017, 6(2): 213-220.
Wen Xuejiao, Qiu Xiaolan, You Hongjian, Lu Xiaojun. Focusing and Parameter Estimation of Fluctuating Targets in High Resolution Spaceborne SAR. JOURNAL OF RADARS, 2017, 6(2): 213-220.
Li X, Deng B, Qin Y, et al.. The influence of target micromotion on SAR and GMTI[J]. IEEE Transactions on Geoscience and Remote Sensing, 2011, 49(7): 2738-2751.
[2]
Wei S and Wang H. The improvement of the conventional GMTI method with single-channel SAR[C]. 2004 IEEE Geoscience and Remote Sensing Symposium, Anchorage, Alaska, USA, Sept 2004: 2626-2628.
[3]
Bamler R. Doppler frequency estimation and the Cramer-Rao bound[J]. IEEE Transactions on Geoscience and Remote Sensing, 1991, 29(3): 385-390.
[4]
Li G, Xia X, Xu J, et al.. A velocity estimation algorithm of moving targets using single antenna SAR[J]. IEEE Transactions on Aerospace and Electronic Systems, 2009, 45(3): 1052-1062.
[5]
Martorella M, Berizzi F, Pastina D, et al.. Spaceborne radar imaging of maritime moving targets with the Cosmo-SkyMed SAR system[J]. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2014, 7(7): 2797-2810.
[6]
Noviello C, Fornara G, and Martorella M. Focused SAR image formation of moving targets based on Doppler parameter estimation[J]. IEEE Transactions on Geoscience and Remote Sensing, 2015, 53(6): 3460-3470.
[7]
Thayaparan T, Abrol S, Riseborough E, et al.. Analysis of radar micro-Doppler signatures from experimental helicopter and human data[J]. IET Radar, Sonar and Navigation, 2007, 1(4): 289-299.
[8]
Chen V C and Lipps R. ISAR imaging of small craft with roll, pitch and yaw analysis[C]. 2000 IEEE International Radar Conference, Alexandria, VA, USA, May 2000: 493-498.
[9]
Noviello C, Fornaro G, Martorella M, et al.. ISAR add-on for focusing moving targets in very high resolution spaceborne SAR data[C]. 2014 IEEE Geoscience and Remote Sensing Symposium, Quebec, Canada, July 2014: 926-929.
[10]
Zhu D Y, Wang L, Tao Q N, et al.. ISAR range alignment by minimizing the entropy of the average range profile[C]. 2006 IEEE Conference on Radar, Verona, New York, USA, April 2006: 813-818.
[11]
Li X, Liu G, and Ni J. Autofocusing of ISAR image based on entropy minimization[J]. IEEE Transactions on Aerospace and Electronic Systems, 1999, 35(4): 1240-1252.
[12]
Wang J, Liu X, and Zhou Z. Minimum entropy phase adjustment for ISAR[J]. IEE Proceedings-Radar, Sonar and Navigation, 2004, 151(4): 203-209.
2017, Vol. 6 
