Spaceborne squinted multichannel synthetic aperture radar data focusing

Spaceborne squinted multichannel synthetic aperture radar data focusing
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星载斜视多通道合成孔径雷达数据聚焦

DOI:
10.1049/iet-rsn.2013.0332
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发表时间:
2014-05
影响因子:
1.7
通讯作者:
Shengyang Li
Shengyang Li
中科院分区:
计算机科学4区
文献类型:
--
作者:
Pingping Huang;Wei Xu;Shengyang Li

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本研究分析了星载斜视多通道沿轨合成孔径雷达(SAR)数据的回波特性。高斜视角度和大发射脉冲带宽导致星载斜视情况下的多普勒频谱向后折叠。眯眼模式下扩展的多普勒带宽增加了方位多通道数据重建的处理难度。根据星载斜视模式的回波特性,提出了一种星载斜视多通道SAR数据聚焦成像方法。该成像方法的关键是方位多通道数据预处理,以解决由每个方位通道中的方位子采样和高斜视角度引起的混叠多普勒频谱。然后,采用改进的距离偏移算法进行后续的等效单基地星载斜视SAR数据聚焦。给出了点目标和分布式目标的仿真结果来验证所提出的成像方法。
This study analyses echo properties of spaceborne squinted multichannel along the track synthetic aperture radar (SAR) data. The highly squint angle and the large transmitted pulse bandwidth lead to Doppler spectrum back folding in the spaceborne squinted case. The extended Doppler bandwidth in the squinted mode increases the processing difficulty of azimuth multichannel data reconstruction. According to echo properties of the spaceborne squinted mode, a new imaging approach for spaceborne squinted multichannel SAR data focusing is proposed. The key point of this imaging approach is azimuth multichannel data preprocessing to resolve the aliased Doppler spectrum caused by both azimuth sub-sampling in each azimuth channel and the highly squint angle. Afterwards, a modified range migration algorithm is taken for consequent equivalent monostatic spaceborne squinted SAR data focusing. Simulation results on point targets and distributed target are given to validate the proposed imaging approach.
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