3-D Time-Domain SAR Imaging of a Forest Using Airborne Multibaseline Data at L- and P-Bands
3-D Time-Domain SAR Imaging of a Forest Using Airborne Multibaseline Data at L- and P-Bands
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DOI：
10.1109/tgrs.2011.2128875
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发表时间：
2011-04
影响因子：
8.2
通讯作者：
Othmar Frey;E. Meier
中科院分区：
文献类型：
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作者：
Othmar Frey;E. Meier
本文详细介绍了一种基于时域反投影的三维重建网格层析处理方法，其中三维聚焦是多视标准波束形成、鲁棒Capon波束形成或多信号分类的改进版本。与以前的合成孔径雷达（SAR）层析成像方法相比，该方法的新颖之处在于，它允许通过利用三维重建网格上的方位角聚焦数据来计算样本协方差矩阵，而无需近似高度相关。将该方法应用于德国航空航天中心（DLR） E-SAR传感器在L和p波段采集的实验多基线四极SAR数据：显示了部分森林地区的层析图像，包括三维体素图，该层析图像显示了非常高水平的层析图像细节，并分析了在法向上全合成孔径和缩小合成孔径的聚焦性能。
In this paper, a time-domain back-projection based tomographic processing approach to a 3-D reconstruction grid is detailed, with the focusing in the third dimension being either modified versions of multilook standard beamforming, robust Capon beamforming, or multiple signal classification. The novel feature of the proposed approach compared to previous synthetic aperture radar (SAR) tomography approaches is that it allows for an approximation-free height-dependent calculation of the sample covariance matrix by exploiting the azimuth-focused data on the 3-D reconstruction grid. The method is applied to experimental multibaseline quad-pol SAR data at L- and P-bands acquired by German Aerospace Center's (DLR) E-SAR sensor: Tomographic images of a partially forested area, including a 3-D voxel plot that visualizes the very high level of detail of the tomographic image, are shown, and an analysis of the focusing performance is given for the full as well as reduced synthetic aperture in the normal direction.