A Moving Target Imaging Approach for the Multichannel in Azimuth High Resolution Wide Swath SAR System
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摘要:
在方位多通道SAR系统中，由于运动目标的回波特性和静止目标的不同，传统的重构滤波器组方法对运动目标的重建是无效的。该文提出一种方位多通道SAR运动目标信号重构方法。该方法首先分析了方位多通道SAR系统中运动目标回波特性，并与静止目标回波形式进行对比，给出了传统重构方法失效的主要原因；通过引入运动目标的径向速度参数，有效实现了匀速运动目标的频谱重构，较好地抑制了方位多通道SAR系统中匀速运动目标的方位模糊。星载仿真实验结果验证了该重构方法的有效性。
Abstract:Since the echo characteristics of moving targets are different from that of stationary targets, the traditional reconstruction filter bank algorithm, i.e., the reconstruction filter algorithm, is not applicable. In this paper, a novel reconstruction approach of the moving target for a multichannel in azimuth High-Resolution Wide-Swath (HRWS) Synthetic Aperture Radar (SAR) system is proposed. The approach firstly analyzes the echo characteristics of the moving target for the multi-channel in azimuth SAR system and gives the main reason for the failure of the traditional reconstruction method in contrast to the form of the stationary target echo. By introducing the radial velocity of the moving target, the spectrum reconstruction of the uniform moving target is effectively realized, and the azimuth ambiguities of the uniform moving target for the multi-channel in azimuth SAR system is well suppressed. Space-borne simulated results confirm the effectiveness of the proposed reconstruction approach.
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表 1 方位多通道星载SAR系统仿真参数
参数 取值 场景中心斜距 890 km 卫星速度 7474.8 m/s 多普勒带宽 3737.4 Hz 载频 9.65 GHz 理想PRF 1495 Hz 实际PRF 1600 Hz 目标速度 5 m/s 
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MOREIRA A, PRATS-IRAOLA P, YOUNIS M, et al. A tutorial on synthetic aperture radar[J]. IEEE Geoscience and Remote Sensing Magazine, 2013, 1(1): 6–43. doi: 10.1109/MGRS.2013.2248301 SUESS M, GRAFMUELLER B, and ZAHN R. A novel high resolution, wide swath SAR system[C]. The IEEE 2001 International Geoscience and Remote Sensing Symposium on Scanning the Present and Resolving the Future, Sydney, Australia, 2001: 1013–1015. GEBERT N, KRIEGER G, and MOREIRA A. Digital beamforming on receive: Techniques and optimization strategies for high-resolution wide-swath SAR imaging[J]. IEEE Transactions on Aerospace and Electronic Systems, 2009, 45(2): 564–592. doi: 10.1109/TAES.2009.5089542 范怀涛, 张志敏, 李宁. 基于特征分解的方位向多通道SAR相位失配校正方法[J]. 雷达学报, 2018, 7(3): 346–354. doi: 10.12000/JR17012FAN Huaitao, ZHANG Zhimin, and LI Ning. Channel phase mismatch calibration for multichannel in azimuth SAR imaging based on Eigen-structure method[J]. Journal of Radars, 2018, 7(3): 346–354. doi: 10.12000/JR17012 赵庆超, 张毅, 王宇, 等. 基于多帧超分辨率的方位向多通道星载SAR非均匀采样信号重建方法[J]. 雷达学报, 2017, 6(4): 408–419. doi: 10.12000/JR17035ZHAO Qingchao, ZHANG Yi, WANG R, et al. Signal reconstruction approach for multichannel SAR in azimuth based on multiframe super resolution[J]. Journal of Radars, 2017, 6(4): 408–419. doi: 10.12000/JR17035 KRIEGER G, GEBERT N, and MOREIRA A. Unambiguous SAR signal reconstruction from nonuniform displaced phase center sampling[J]. IEEE Geoscience and Remote Sensing Letters, 2004, 1(4): 260–264. doi: 10.1109/LGRS.2004.832700 PAPOULIS A. Generalized sampling expansion[J]. IEEE Transactions on Circuits and Systems, 1977, 24(11): 652–654. doi: 10.1109/TCS.1977.1084284 LI Zhenfang, WANG Hongyang, SU Tao, et al. Generation of wide-swath and high-resolution SAR images from multichannel small spaceborne SAR systems[J]. IEEE Geoscience and Remote Sensing Letters, 2005, 2(1): 82–86. doi: 10.1109/LGRS.2004.840610 郭振永, 袁新哲, 张平. 一种多通道SAR高分辨率宽测绘带成像算法[J]. 电子与信息学报, 2008, 30(2): 310–313. doi: 10.3724/SP.J.1146.2006.00986GUO Zhenyong, YUAN Xinzhe, and ZHANG Ping. An algorithm of multichannel SAR high-resolution and wide-swath imaging[J]. Journal of Electronics &Information Technology, 2008, 30(2): 310–313. doi: 10.3724/SP.J.1146.2006.00986 PERRY R P, DIPIETRO R C, and FANTE R L. SAR imaging of moving targets[J]. IEEE Transactions on Aerospace and Electronic Systems, 1999, 35(1): 188–200. doi: 10.1109/7.745691 MARQUES P A C and BIOUCAS DIAS J M. Moving targets processing in SAR spatial domain[J]. IEEE Transactions on Aerospace and Electronic Systems, 2007, 43(3): 864–874. doi: 10.1109/taes.2007.4383579 BARBAROSSA S and FARINA A. Space-time-frequency processing of synthetic aperture radar signals[J]. IEEE Transactions on Aerospace and Electronic Systems, 1994, 30(2): 341–358. doi: 10.1109/7.272259 BAUMGARTNER S V and KRIEGER G. Simultaneous high-resolution wide-swath SAR imaging and ground moving target indication: Processing approaches and system concepts[J]. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2015, 8(11): 5015–5029. doi: 10.1109/JSTARS.2015.2450019 WANG Xiangyu, WANG R, LI Ning, et al. A method of estimating the velocity of moving targets for use in high-resolution wide-swath SAR imaging[J]. Remote Sensing Letters, 2018, 9(4): 305–313. doi: 10.1080/2150704X.2017.1420263 -
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