Rotation Center Estimation Algorithm for ISAR Image of the Space Target Based on Image Rotation and Correlation
-
摘要: 为了消除逆合成孔径雷达(ISAR)越分辨单元徙动(MTRC)引起的图像散焦，需要估计目标的等效旋转中心。该文以空间目标为研究对象，提出了一种基于图像旋转相关的ISAR旋转中心估计算法。首先，分析了ISAR的瞬时成像机理；其次，将采用相同运动补偿后的回波数据分段成像，得到不同视角的2幅图像；然后，基于定标后的图像像素旋转和图像相关，估计等效旋转中心。当假定的等效旋转中心与真实的旋转中心一致时，2幅图像相关性最大，据此得到旋转中心位置。仿真实验表明，该算法能够有效利用图像整体信息，估计出高精度的目标等效旋转中心，利于提高成像质量。Abstract: The equivalent rotation center should be estimated accurately in the Inverse Synthetic Aperture Radar (ISAR) for the issue of image defocusing induced by the Migration Through Resolution Cells (MTRC). In this paper, an equivalent rotation center estimation algorithm based on image rotation and correlation is proposed for the space target. First, the instantaneous imaging mechanism of ISAR is analyzed. Second, two images with different observation angles are obtained by using the echo data with the same motion compensation algorithm. Finally, the equivalent rotation center is estimated based on the scaled image pixel rotation and image correlation. Consequently, the estimated position of the rotation center is obtained, when the assumed rotation center is in accordance with the real one and the maximum correlation coefficient of two images is achieved. The results demonstrate the effectiveness and robustness of the proposed algorithm.
-
表 2 国际空间站TLE根数(2018年8月10日)
1 25544U 98067A 18222.05156756 0.00001108
00000-0 24256-40 99932 25544 51.6416 110.2592 0005763 44.5593
95.2967 15.53817336126892
下载: 导出CSV
表 3 仿真参数设置
参数名称 参数值 载频 10 GHz 带宽 600 MHz 脉冲宽度 10 μs 采样率 750 MHz 脉冲重复频率 100 Hz 累积脉冲个数 1024 累积转角 6.73° 距离分辨率 0.25 m 方位分辨率 0.128 m
下载: 导出CSV
-
周叶剑, 张磊, 王虹现, 等. 空间轨道目标的逆合成孔径雷达成像质量分析[J]. 雷达学报, 2017, 6(1): 17–24. doi: 10.12000/JR16136ZHOU Yejian, ZHANG Lei, WANG Hongxian, et al. Performance analysis on ISAR imaging of space targets[J]. Journal of Radars, 2017, 6(1): 17–24. doi: 10.12000/JR16136 邢孟道, 高悦欣, 陈溅来, 等. 海上舰船目标雷达成像算法[J]. 科技导报, 2017, 35(20): 53–60. doi: 10.3981/j.issn.1000-7857.2017.20.005XING Mengdao, GAO Yuexin, CHEN Jianlai, et al. A survey of the radar imaging algorithms for ship targets on the sea[J]. Science &Technology Review, 2017, 35(20): 53–60. doi: 10.3981/j.issn.1000-7857.2017.20.005 谷文堃, 王党卫, 马晓岩. 分布式MIMO-ISAR子图像融合方法[J]. 雷达学报, 2017, 6(1): 90–97. doi: 10.12000/JR16042GU Wenkun, WANG Dangwei, and MA Xiaoyan. Distributed MIMO-ISAR sub-image fusion method[J]. Journal of Radars, 2017, 6(1): 90–97. doi: 10.12000/JR16042 XU Gang, YANG Lei, BI Guoan, et al. Enhanced ISAR imaging and motion estimation with parametric and dynamic sparse Bayesian learning[J]. IEEE Transactions on Computational Imaging, 2017, 3(4): 940–952. doi: 10.1109/TCI.2017.2750330 GUO Baofeng, WANG Junling, GAO Meiguo, et al. Research on spatial-variant property of bistatic ISAR imaging plane of space target[J]. Chinese Physics B, 2015, 24(4): 048402. doi: 10.1088/1674-1056/24/4/048402 ZHANG Shunsheng, SUN Sibo, ZHANG Wei, et al. High-resolution bistatic ISAR image formation for high-speed and complex-motion targets[J]. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2015, 8(7): 3520–3531. doi: 10.1109/JSTARS.2015.2417192 SHI Lin, GUO Baofeng, MA Juntao, et al. A novel channel calibration method for bistatic ISAR imaging system[J]. Applied Sciences, 2018, 8(11): 2160. doi: 10.3390/app8112160 马俊涛, 高梅国, 胡文华, 等. 空间目标多站ISAR优化布站与融合成像方法[J]. 电子与信息学报, 2017, 39(12): 2834–2843.MA Juntao, GAO Meiguo, HU Wenhua, et al. Optimum distribution of multiple location ISAR and multi-angles fusion imaging for space target[J]. Journal of Electronics &Information Technology, 2017, 39(12): 2834–2843. 符吉祥, 孙光才, 邢孟道. 一种大转角ISAR两维自聚焦平动补偿方法[J]. 电子与信息学报, 2017, 39(12): 2889–2898. doi: 10.11999/JEIT170303FU Jixiang, SUN Guangcai, and XING Mengdao. A two dimensional autofocus translation compensation method for wide-angle ISAR imaging[J]. Journal of Electronics &Information Technology, 2017, 39(12): 2889–2898. doi: 10.11999/JEIT170303 马林. 空间目标探测雷达技术[M]. 北京: 电子工业出版社, 2013: 10–13.MA Lin. Radar Technology for Space Target Detection[M]. Beijing: Publishing House of Electronics Industry, 2013: 10–13. 姜正林, 邢孟道, 保铮. ISAR成像的越距离单元走动校正[J]. 电子与信息学报, 2002, 24(5): 577–583.JIANG Zhenglin, XING Mengdao, and BAO Zheng. Correction of migration through resolution cell in ISAR imaging[J]. Journal of Electronics &Information Technology, 2002, 24(5): 577–583. 韩兴斌, 胡卫东, 郁文贤. ISAR越距离单元走动校正的近似极坐标算法[J]. 系统工程与电子技术, 2007, 29(3): 346–349. doi: 10.3321/j.issn:1001-506X.2007.03.004HAN Xingbin, HU Weidong, and YU Wenxian. Approximately polar formatting algorithm to compensate migration through resolution cells in ISAR imaging[J]. Systems Engineering and Electronics, 2007, 29(3): 346–349. doi: 10.3321/j.issn:1001-506X.2007.03.004 郭宝锋, 尚朝轩, 王俊岭, 等. 双基地角时变下的逆合成孔径雷达越分辨单元徙动校正算法[J]. 物理学报, 2014, 63(23): 238406. doi: 10.7498/aps.63.238406GUO Baofeng, SHANG Chaoxuan, WANG Junling, et al. Correction of migration through resolution cell in bistatic inverse synthetic aperture radar in the presence of time-varying bistatic angle[J]. Acta Physica Sinica, 2014, 63(23): 238406. doi: 10.7498/aps.63.238406 MARTORELLA M. Novel approach for ISAR image cross-range scaling[J]. IEEE Transactions on Aerospace and Electronic Systems, 2008, 44(1): 281–294. doi: 10.1109/TAES.2008.4517004 XU Gang, YANG Lei, BI Guoan, et al. Maneuvering target imaging and scaling by using sparse inverse synthetic aperture[J]. Signal Processing, 2017, 137: 149–159. doi: 10.1016/j.sigpro.2017.01.016 KANG B S, BAE J H, KANG M S, et al. Bistatic-ISAR cross-range scaling[J]. IEEE Transactions on Aerospace and Electronic Systems, 2017, 53(4): 1962–1973. doi: 10.1109/TAES.2017.2677798 SHENG Jialian, XING Mengdao, ZHANG Lei, et al. ISAR cross-range scaling by using sharpness maximization[J]. IEEE Geoscience and Remote Sensing Letters, 2015, 12(1): 165–169. doi: 10.1109/LGRS.2014.2330625 叶春茂, 许稼, 左渝, 等. 逆合成孔径雷达目标等效旋转中心估计[J]. 清华大学学报: 自然科学版, 2009, 49(8): 1205–1208. doi: 10.16511/j.cnki.qhdxxb.2009.08.023YE Chunmao, XU Jia, ZUO Yu, et al. Rotating center estimation for inverse synthetic aperture radar imaging[J]. Journal of Tsinghua University:Science and Technology, 2009, 49(8): 1205–1208. doi: 10.16511/j.cnki.qhdxxb.2009.08.023 叶春茂, 许稼, 彭应宁, 等. 多视观测下雷达转台目标成像的关键参数估计[J]. 中国科学: 信息科学, 2010, 53(8): 1641–1652.YE Chunmao, XU Jia, PENG Yingning, et al. Key parameter estimation for radar rotating object imaging with multi-aspect observations[J]. Science China Information Sciences, 2010, 53(8): 1641–1652. 陈磊, 韩蕾, 白显宗, 等. 空间目标轨道力学与误差分析[M]. 北京: 国防工业出版社, 2010: 204–205.CHEN Lei, HAN Lei, BAI Xianzong, et al. Orbital Dynamics and Error Analysis of Space Object[M]. Beijing: National Defend Industry Press, 2010: 204–205. 黄雅静. 非匀速旋转目标ISAR成像技术研究[D]. [硕士论文], 国防科学技术大学, 2008: 99–116.HUANG Yajing. Research on ISAR Imaging of non-uniformly rotational targets[D]. [Master dissertation], National University of Defense Technology, 2008: 99–116. WEINMANN F. Ray tracing with PO/PTD for RCS modeling of large complex objects[J]. IEEE Transactions on Antennas and Propagation, 2006, 54(6): 1797–1806. doi: 10.1109/TAP.2006.875910 -
下载:
图(8) / 表(4)
计量
- 文章访问数: 1953
- HTML全文浏览量: 738
- PDF下载量: 82
- 被引次数: 0
