基于几何校正的聚束SAR快速分级后投影算法

左绍山; 杨泽民; 孙光才; 邢孟道

doi:10.11999/JEIT141254

基于几何校正的聚束SAR快速分级后投影算法

doi: 10.11999/JEIT141254

基金项目:

国家自然科学青年基金(61301292)和教育部博士点基金(20130203120007)资助课题

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出版历程
- 收稿日期: 2014-09-26
- 修回日期: 2015-02-09
- 刊出日期: 2015-06-19

Geometric Correction Based Fast Factorized Back Projection Algorithm for Spotlight SAR Imaging

摘要

摘要: 快速分级后投影(Fast Factorized Back Projection, FFBP)算法大幅减少了原始后投影算法的插值次数，提升运算效率。然而图像合成过程中仍然需要大量的图像域2维插值操作，庞大的计算量限制了其在实际中的应用。该文提出一种基于几何校正的聚束SAR快速分级后投影算法。该算法利用几何校正的方法实现子图像配准，即在满足聚焦性能的前提下，通过距离维平移和角度维旋转完成子图像在不同坐标系下的投影和子图像合成。该算法避免了逐点插值运算，进一步降低了FFBP算法的计算量。仿真结果表明，该算法能高精度聚焦成像，并且其运算效率相对于基于图像域2维插值的FFBP算法显著提高。
- SAR /
- 聚束 /
- 快速分级后投影 /
- 几何校正 /
- 逐点插值
Abstract: Compared with the Back Projection Algorithm (BPA), the interpolation load of the Fast Factorized Back Projection Algorithm (FFBPA) is released. However, the 2D interpolation in the image domain is essential for the FFBPA and the intensive computational burden limits its application in practice. This paper presents the geometric correction based FFBPA for the spotlight SAR imaging. In this algorithm, the sub-image registration is accomplished by the geometric correction method that the sub-image projection in the different coordinate systems and sub-image fusion are fulfilled by the shift in the range dimension and the rotation in the angle dimension. Thus the method avoids the individual interpolation and it is more efficient than the FFBPA. Simulation results validate its imaging performance and efficiency.
- SAR /
- Spotlight /
- Fast Factorized Back Projection Algorithm (FFBPA) /
- Geometric correction /
- Individual interpolation

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参考文献(25)

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