太赫兹合成孔径雷达成像运动补偿算法

张群英; 江兆凤; 李超; 吴世有; 方广有

doi:10.11999/JEIT160201

太赫兹合成孔径雷达成像运动补偿算法

doi: 10.11999/JEIT160201

1.
(中国科学院电子学研究所电磁辐射与探测技术重点实验室北京 100190) ②(中国科学院大学北京 100049)

基金项目:

国家高技术研究发展计划(2015AA8125021)

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出版历程
- 收稿日期: 2016-03-03
- 修回日期: 2016-07-01
- 刊出日期: 2017-01-19

Motion Compensation Imaging Algorithm of TeraHertz Synthetic Aperture Radar

1.
(Key Laboratory of Electromagnetic Radiation and Detection Technology, Institute of Electronics,Chinese Academy of Sciences, Beijing 100190, China)

Funds:

The National High Technology Research and Development Program of China (2015AA8125021)

摘要

摘要: 合成孔径雷达(SAR)成像理论分析和工程经验表明当雷达平台的运动误差幅度达到亚波长量级时，会影响图像的聚焦质量。相对传统微波SAR，太赫兹合成孔径雷达(THz-SAR)工作在波长更短的太赫兹频段，对搭载雷达平台的稳定性要求更苛刻，需要达到微米级的控制和测量精度，目前的平台控制和测量技术还不能满足要求。该文提出一种基于回波数据的THz-SAR成像运动补偿算法，通过惯性测量单元输出的姿态信息完成由运动误差引起的距离徙动的校正，结合天线方向图和粗聚焦图像中特显点的最大幅值估计最优位置并构建理想回波。利用实际回波和理想回波数据提取由平台运动误差引起回波的相位误差并进行补偿，有效地实现了THz-SAR高分辨率成像。采用中心频率0.2 THz的SAR系统进行室外车载实验，对目标进行2维高分辨成像，得到角反射器和金属条的SAR图像。实验结果验证了所提运动补偿算法的正确性和有效性。
- 太赫兹合成孔径雷达 /
- 太赫兹成像 /
- 运动补偿算法 /
- 平动误差
Abstract: Theoretical analysis and engineering experience of SAR imaging shows that radar platforms motion error will affect the quality of the image if its amplitude is greater than sub wavelength. Compared with traditional SAR working in microwave frequency band, TeraHertz SAR (THz-SAR) works in a shorter wavelength as the TeraHertz band, the control and measure accuracy of radar platforms motion should be micron dimension, but the current technology can not meet the requirements. A novel motion compensation algorithm for THz-SAR imaging based on echo data is proposed in this paper. The attitude information from the inertial measurement unit is used to calibrate the migration error caused by the motion. Firstly, an obvious point like object is found in the coarse focusing image and the optimal position of this point is estimated by combining the antenna pattern and the maximum echos amplitude. Then the ideal echo of this point object is generated using the above estimated position and the phase error caused by the motion error of the platform is extracted by comparing the actual echo and the ideal echo. The extracted phase error is used to compensate the motion error of platform. The SAR system with center frequency 0.2 THz is used to carry out the outdoor vehicle experiment. Two dimensional high resolutions of SAR images of the corner reflectors and the metal strips are achieved. The validity of the proposed motion compensation algorithm is proved by experimental results.
- TeraHertz Synthetic Aperture Radar (THz-SAR) /
- TeraHertz imaging /
- Motion compensation /
- Translational error

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参考文献(27)

张存林, 张岩, 等. 太赫兹感测与成像[M]. 北京: 国防工业出版社, 2008: 160-164.

ZHANG Cunlin, ZHANG Yan, et al. Terahertz Sensing and Imaging[M]. Beijing: National Defense Industry Press, 2008: 160-164.

徐政五. 基于太赫兹雷达的人体心跳和微动特征检测方法研究[D]. [博士论文], 电子科技大学, 2014.

XU Zhengwu. The human heartbeat and micro-feature detection based on the THz radar[D]. [Ph.D. dissertation], University of Electronic Science and Technology of China, 2014.

WAHAIA F, KASALYNAS I, VENCKEVICIUS R, et al. Terahertz absorption and reflection imaging of carcinoma- affected colon tissues embedded in paraffin[J]. Journal of Molecular Structure, 2015, 1107: 214-219. doi: 10.1016/j. molstruc.2015.11.048.

BOWMAN T C, El-SHENAWEE M, and CAMPBELL L K. Terahertz imaging of excised breast tumor tissue on paraffin sections[J]. IEEE Transactions on Antennas Propagation, 2015, 63(5): 2088-2097. doi: 10.1109/TAP.2015.2406893.

ANDERSON J P, SHAPIRO M A, TEMKIN R J, et al. Studies of the 1.5-MW 110-GHz gyrotron experiment[J]. IEEE Transactions on Plasma Science, 2004, 32(3): 877-883. doi: 10.1109/TPS.2004.828813.

TOUSI Y and AFSHARI E. A high-power and scalable 2-D phased array for terahertz CMOS integrated systems[J]. IEEE Journal of Solid-State Circuits, 2015, 50(2): 597-609. doi: 10.1109/JSSC.2014.2375324.

PHILIPP M, GRAF U U, WAGNER-GENTNER A, et al. Compact 1.9 THz BWO local-oscillator for the GREAT heterodyne receiver[J]. Infrared Physics Technology, 2007, 51(1): 54-59. doi: 10.1016/j.infrared.2006.10.034.

VENDIK I B, VENDIK O G, ODIT M A, et al. Tunable metamaterials for controlling THz radiation[J]. IEEE Transactions on Terahertz Science Technology, 2012, 2(5): 538-549. doi: 10.1109/TTHZ.2012.2209878.

GOYETTE T M, DICKINSON J C, WALDMAN J, et al. A 1.56 THz compact radar range for W-Band imagery of scale-model tactical targets[J]. Proceedings of SPIE-The International Society for Optical Engineering, 2000, 4053: 615-622. doi: 10.1117/12.396372.

DENGLER R J, COOPER K B, CHATTOPADHYAY G, et al. 600 GHz imaging radar with 2 cm range resolution[C]. IEEE MTT-S International Microwave Symposium, Honolulu, Hawaii, USA, 2007: 1371-1374. doi: 10.1109/ MWSYM.2007.380468.

GILL J, LEE C, CHATTOPADHYAY G, et al. Array technology for terahertz imaging[C]. Passive and Active Millimeter-Wave Imaging XV, Baltimore, Maryland, USA, 2012: 836202. doi: 10.1117/12.920497.

成彬彬, 江舸, 陈鹏, 等. 0.67 THz高分辨力成像雷达[J]. 太赫兹科学与电子信息学报, 2013, 11(1): 7-11.

CHENG Binbin, JIANG Ge, CHEN Peng, et al. 0.67 THz high resolution imaging radar[J]. Journal of Terahertz Science and Electronic Information Technology, 2013, 11(1): 7-11. doi: 10.3788/HPLPB20132506.1577.

GU S, LI C, GAO X, et al. Three-dimensional image reconstruction of targets under the illumination of terahertz Gaussian beam-theory and experiment[J]. IEEE Transactions on Geoscience Remote Sensing, 2013, 51(4): 2241-2249. doi: 10.1109/TGRS.2012.2209892.

蔡英武, 杨陈, 曾耿华, 等. 太赫兹极高分辨力雷达成像试验研究[J]. 强激光与粒子束, 2012, 24(1): 7-9. doi: 10.3788/ HPLPB20122401.0007.

CAI Yingwu, YANG Chen, ZENG Genghua, et al. Experimental research on high resolution terahertz radar imaging[J]. High Power Laser and Particle Beams, 2012, 24(1): 7-9. doi: 10.3788/HPLPB20122401.0007.

许景周, 张希成. 太赫兹科学技术和应用[M]. 北京: 北京大学出版社, 2007: 80-86.

XU Jingzhou and ZHANG Xicheng. Terahertz Science Technology and Applications[M]. Beijing: Peking University Press, 2007: 80-86.

ZHANG B, PI Y, and LI J. Terahertz imaging radar with inverse aperture synthesis techniques: System structure, signal processing and experiment results[J]. IEEE Sensors Journal, 2015, 15(1): 290-299. doi: 10.1109/JSEN.2014. 2342495.

林华. 无人机载太赫兹合成孔径雷达成像分析与仿真[J]. 信息与电子工程, 2010, 8(4): 373-377.

LIN Hua. Analysis and simulation of UAV terahertz wave synthetic aperture radar imaging[J]. Information and Electronic Engineering, 2010, 8(4): 373-377.

赵雨露, 张群英, 李超, 等. 视频合成孔径雷达振动误差分析及补偿方案研究[J]. 雷达学报, 2015, 4(2): 230-239. doi: 10. 12000/JR14153.

ZHAO Yulu, ZHANG Qunying, LI Chao, et al. Vibration error analysis and motion compensation of video synthetic aperture radar[J]. Journal of Radars, 2015, 4(2): 230-239. doi: 10.12000 /JR14153.

安道祥. 高分辨SAR成像处理研究[D]. [博士论文], 国防科学技术大学研究生院, 2011.

AN Daoxiang. Study on the imaging techniques for high resolution SAR systems[D]. [Ph.D. dissertation], Graduate School of National University of Defense Technology, 2011.

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