Maneuvering SAR Imaging Algorithms Based on the Separation of Azimuthal Motion Information
-
摘要:
针对机动SAR成像，该文提出一种基于方位向运动信息分离的成像算法。在完成距离压缩后，通过方位向运动信息分离，去除非方位向运动造成的距离走动和空变性影响，然后利用方位向速度等效变换实现距离弯曲校正，最后通过非均匀傅里叶变换实现方位向的压缩。该算法利用3维坐标在斜距方程中性质相同的原理，经过非方位向运动信息的校正，将3维空间运动等效成方位向直线非匀速运动模型，实现了机动SAR成像。通过仿真验证了算法在不同运动状态下的适用性。算法简单稳定、适用性强。
Abstract:A maneuvering SAR imaging algorithm is proposed based on the separation of azimuthal motion information. After range compression, the influence of non-azimuthal motion on range walk and spatiality is removed by separating azimuthal motion information. Then, the azimuth velocity equivalent transformation is used to realize range bending correction. Finally, the azimuth compression is realized by non-uniform Fourier transform. Using this principle, the parameters of three directions in the oblique distance equation have the same properties in the three-dimensional coordinate system. The algorithm transforms the three-dimensional spatial motion into the azimuthal non-uniform motion model. Through simulation, the applicability of the algorithm to different models and other motion states is verified. The algorithm is simple, stable and applicable.
-
Key words:
- SAR imaging /
- Frequency domain /
- Maneuvering
-
刘雨雨. 复杂运动平台SAR成像技术研究[D]. [硕士论文], 电子科技大学, 2016.LIU Yuyu. Study of SAR imaging algorithm based on complex motion platform[D]. [Master dissertation], University of Electronic Science and Technology, 2016. 孟自强. 双基前视高机动平台SAR系统特性及成像算法研究[D]. [博士论文], 西安电子科技大学, 2016.MENG Ziqiang. System characteristic and imaging algorithm study on bistatic forward-looking high-speed maneuvering-platform SAR[D]. [Ph.D. dissertation], Xidian University, 2016. 周松. 高速机动平台SAR成像算法及运动补偿研究[D]. [博士论文], 西安电子科技大学, 2013.ZHOU Song. Study on imaging algorithm and motion compensation for high-speed manoeuvring-platform SAR[D]. [Ph.D. dissertation], Xidian University, 2013. 班阳阳. 基于后向投影的SAR成像算法与GPU加速研究[D]. [硕士论文], 南京航空航天大学, 2014.BAN Yangyang. SAR imaging algorithm and GPU acceleration research based on back projection[D]. [Master dissertation], Nanjing University of Aeronautics and Astronautics, 2014. 叶晓明, 张国峰, 胡晓光, 等. 近前视弹载SAR的改进后向投影成像算法[J]. 北京航空航天大学学报, 2015, 41(3): 492–501. doi: 10.13700/j.bh.1001-5965.2014.0223YE Xiaoming, ZHANG Guofeng, HU Xiaoguang, et al. Improved back-projection imaging algorithm for approximate forward looking missile-borne SAR[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(3): 492–501. doi: 10.13700/j.bh.1001-5965.2014.0223 唐江文, 邓云凯, 王宇, 等. Bulk-FFBP: 基于距离向整体处理的快速分解后向投影算法[J]. 电子与信息学报, 2017, 39(2): 405–411. doi: 10.11999/JEIT160373TANG Jiangwen, DENG Yunkai, WANG Yu, et al. Bulk-FFBP: Fast factorized back-projection algorithm based on range bulk processing[J]. Journal of Electronics &Information Technology, 2017, 39(2): 405–411. doi: 10.11999/JEIT160373 周鹏. 弹载SAR多种工作模式的成像算法研究[D]. [博士论文], 西安电子科技大学, 2011.ZHOU Peng. Study on imaging algorithms for missile-borne SAR in multiple modes[D]. [Ph.D. dissertation], Xidian University, 2011. 彭岁阳, 张军, 胡卫东, 等. 非匀速平飞模式下双基地SAR成像分析[J]. 电子与信息学报, 2010, 32(11): 2648–2654. doi: 10.3724/SP.J.1146.2009.01461PENG Suiyang, ZHANG Jun, HU Weidong, et al. The imaging analysis of bistatic SAR with parallel track of variable velocity[J]. Journal of Electronics &Information Technology, 2010, 32(11): 2648–2654. doi: 10.3724/SP.J.1146.2009.01461 洪文, 林赟, 谭维贤, 等. 地球同步轨道圆迹SAR研究[J]. 雷达学报, 2015, 4(3): 241–253. doi: 10.12000/JR15062HONG Wen, LIN Yun, TAN Weixian, et al. Study on geosynchronous circular SAR[J]. Journal of Radars, 2015, 4(3): 241–253. doi: 10.12000/JR15062 景国斌. 机载/星载超高分辨率SAR成像技术研究[D]. [博士论文], 西安电子科技大学, 2018.JING Guobin. Study on very-high-resolution of airborne/spaceborne SAR imaging[D]. [Ph.D. dissertation], Xidian University, 2018. 张群英, 江兆凤, 李超, 等. 太赫兹合成孔径雷达成像运动补偿算法[J]. 电子与信息学报, 2017, 39(1): 129–137. doi: 10.11999/JEIT160201ZHANG Qunying, JIANG Zhaofeng, LI Chao, et al. Motion compensation imaging algorithm of terahertz synthetic aperture radar[J]. Journal of Electronics &Information Technology, 2017, 39(1): 129–137. doi: 10.11999/JEIT160201 PONCE O, PRATS P, RODRIGUEZ-CASSOLA M, et al. Processing of circular SAR trajectories with fast factorized back-projection[C]. 2011 International Geoscience and Remote Sensing Symposium, Vancouver, Canada, 2011: 3692–3695. doi: 10.1109/IGARSS.2011.6050026. 李震宇, 杨军, 梁毅, 等. 弹载SAR子孔径大斜视成像方位空变校正新方法[J]. 西安电子科技大学学报: 自然科学版, 2015, 42(4): 88–94, 197. doi: 10.3969/j.issn.1001-2400.2015.04.015LI Zhenyu, YANG Jun, LIANG Yi, et al. New method for azimuth-dependent correction of highly squint missile-borne SAR subaperture imaging[J]. Journal of Xidian University, 2015, 42(4): 88–94, 197. doi: 10.3969/j.issn.1001-2400.2015.04.015 邢涛, 李军, 王冠勇, 等. 基于非均匀快速傅里叶变换的SAR方位向运动补偿算法[J]. 电子与信息学报, 2014, 36(5): 1023–1029. doi: 10.3724/SP.J.1146.2013.00969XING Tao, LI Jun, WANG Guanyong, et al. An along-track motion compensation algorithm based on non-uniform fast Fourier transform (NUFFT) for SAR[J]. Journal of Electronics &Information Technology, 2014, 36(5): 1023–1029. doi: 10.3724/SP.J.1146.2013.00969 董祺, 杨泽民, 李震宇, 等. 基于方位空变斜距模型的大斜视机动平台波数域SAR成像算法[J]. 电子与信息学报, 2016, 38(12): 3166–3173. doi: 10.11999/JEIT160785DONG Qi, YANG Zemin, LI Zhenyu, et al. Wavenumber-domain imaging algorithm for high squint SAR based on azimuth variation range model[J]. Journal of Electronics &Information Technology, 2016, 38(12): 3166–3173. doi: 10.11999/JEIT160785 -
下载:
图(7)
计量
- 文章访问数: 970
- HTML全文浏览量: 335
- PDF下载量: 59
- 被引次数: 0
下载:
