Application of fast factorized back-projection algorithm for high-resolution highly squinted airborne SAR imaging
Application of fast factorized back-projection algorithm for high-resolution highly squinted airborne SAR imaging
复制标题
快速分解反投影算法在高分辨率大斜视机载SAR成像中的应用
DOI：
10.1007/s11432-015-0927-3
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发表时间：
2017-06
期刊：
影响因子：
--
通讯作者：
Hongxian WANG
中科院分区：
文献类型：
--
作者：
Lei ZHANG;Haolin LI;Zhiwei XU;Hongxian WANG
在斜视合成孔径雷达（SAR）成像中，距离-方位耦合需要精确的距离单元偏移校正（RCMC）。此外，对于高分辨率机载SAR，运动补偿（MOCO）随着斜视角度的增大而变得复杂，从而降低了多普勒域成像算法的性能。另一方面，时域反投影（BP） SAR成像方法被认为是实现精确图像聚焦和MOCO的最佳解决方案。在现有的BP算法中，快速分解反投影（FFBP）算法是高效实现高分辨率图像的最重要代表之一。本文通过对得到的图像的方位角脉冲响应函数（AIRF）的推导，研究了FFBP算法的原理和应用。提出并分析了BP图像中运动误差引起的频谱位移现象。基于严格的数学推导，提出了一种改进的FFBP算法，实现了高分辨率高斜视机载SAR运动补偿与精确成像的无缝集成，实际数据验证了该方法的有效性。
In squinted synthetic aperture radar (SAR) imaging, the range-azimuth coupling requires precise range cell migration correction (RCMC). Moreover, for high-resolution airborne SAR, motion compensation (MOCO) becomes complicated as the squint angle increases, thereby degrading the performance of Doppler-domain imaging algorithms. On the other hand, time-domain back-projection (BP) SAR imaging approaches are considered as optimal solutions to performing precise image focusing and MOCO. Among current BP algorithms, the fast factorized back-projection (FFBP) algorithm is one of the most essential representatives that achieve high-resolution images in an efficient manner. In this paper, the principle and applications of the FFBP algorithm are investigated through the derivation of the azimuth impulse response function (AIRF) of the resulting image. The phenomenon of spectrum displacement induced by motion errors in the BP image is presented and analyzed. Based on rigorous mathematical derivations, a modified FFBP algorithm is proposed to facilitate a seamless integration with motion compensation and accurate imagery of high-resolution highly squinted airborne SAR. Real data results confirm the effectiveness of the proposed approaches.
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影响因子：
4.8
作者：
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DOI：
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期刊：
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期刊：
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