Abstract：Array Synthetic Aperture Radar (ASAR) system radar imaging field has gained attention because of its three-dimensional (3-D) imaging ability. A novel Circular Array SAR (CASAR) system is employed for 3-D high-resolution radar imaging to overcome the drawbacks exhibited by linear array SAR in high-resolution imaging and by circular SAR in side-lobe suppression. Point Spread Function (PSF) model based on the CASAR system is derived, and the advantages of the new configuration of the circular array in 3-D imaging are theoretically analyzed. Prototype CASAR experimental system is built on the basis of the abovementioned analysis. PSF simulation experiments and outdoor 3-D CASAR imaging experiments under outdoor conditions are performed to verify performance of the CASAR system in 3-D SAR imaging. Compared imaging results acquired using linear array SAR, circular SAR, and CASAR system proves that the CASAR system has high-resolution 3-D SAR images and demonstrates effective side-lobe suppression capability.
明 婧, 张晓玲, 蒲 羚, 师 君. 一种新型圆迹阵列三维SAR系统的点扩散函数分析与地面实验结果[J]. 雷达学报, 2018, 7(6): 770-776.
Ming Jing, Zhang Xiaoling, Pu Ling, Shi Jun. PSF Analysis and Ground Test Results of a Novel Circular Array 3-D SAR System. JOURNAL OF RADARS, 2018, 7(6): 770-776.
Devadithya S, Pedross-Engel A, Watts C M, et al. GPU-accelerated enhanced resolution 3-D SAR imaging with dynamic metamaterial antennas[J]. IEEE Transactions on Microwave Theory and Techniques, 2017, 65(12):5096-5103. DOI:10.1109/TMTT.2017.2766060
[2]
Ren X Z, Qin Y, and Tian L J. Three-dimensional imaging algorithm for tomography SAR based on multiple signal classification[C]. Proceedings of 2014 IEEE International Conference on Signal Processing, Communications and Computing, Guilin, China, 2014:120-123. DOI:10.1109/ICSPCC.2014.6986165.
[3]
Xie H T, Shi S Y, An D X, et al. Fast factorized backprojection algorithm for one-stationary bistatic spotlight circular SAR image formation[J]. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2017, 10(4):1494-1510. DOI:10.1109/JSTARS.2016.2639580
[4]
Chen L P, An D X, and Huang X T. A backprojection-based imaging for circular synthetic aperture radar[J]. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2017, 10(8):3547-3555. DOI:10.1109/JSTARS.2017.2683497
[5]
Liu X, Yu J, Zhao H, et al.. An along-track sparse imaging method for forward-looking array SAR[C]. Proceedings of IET International Radar Conference 2015, Hangzhou, China, 2015:1-5. DOI:10.1049/cp.2015.0996.
[6]
Shi J, Zhang X L, Yang J Y, et al. APC trajectory design for "one-active" linear-array three-dimensional imaging SAR[J]. IEEE Transactions on Geoscience and Remote Sensing, 2010, 48(3):1470-1486. DOI:10.1109/TGRS.2009.2031430
[7]
Wei S J, Zhang X L, and Shi J. Spaceborne-airborne bistatic linear array SAR high resolution 3-D imaging based on sparsity exploiting[C]. Proceedings of the 201619th International Conference on Information Fusion, Heidelberg, Germany, 2016:1518-1522.
[8]
Axelsson S R J. Beam characteristics of three-dimensional SAR in curved or random paths[J]. IEEE Transactions on Geoscience and Remote Sensing, 2004, 42(10):2324-2334. DOI:10.1109/TGRS.2004.834802
[9]
Tang L, Zhu Y F, and Fu Q. Stepped frequency SAR imaging based on compensation in Doppler domain[C]. Proceedings of 2014 IEEE International Conference on Signal Processing, Communications and Computing, Guilin, China, 2014:627-631. DOI:10.1109/ICSPCC.2014.6986269.
[10]
Li Y C, Zhang L, Liu B C, et al. Stepped-frequency inverse synthetic aperture radar imaging based on adjacent pulse correlation integration and coherent processing[J]. IET Signal Processing, 2011, 5(7):632-642. DOI:10.1049/iet-spr.2009.0301
[11]
Shi J, Zhang X L, Sun H, et al.. Explanation of synthetic aperture 3-D imaging technique via EFIE[C]. Proceedings of the 20113rd International Asia-Pacific Conference on Synthetic Aperture Radar, Seoul, South Korea, 2011:1-4.
2018, Vol. 7 
