后向投影算法具有精确成像、易于补偿、适于多种阵列构型及信号形式等优点，广泛应用于雷达成像领域。针对三维成像中，巨大计算量带来的低运算效率问题，文中利用孔径分块的方式将二维快速因式分解后向投影（FFBP）扩展至三维成像应用，建立了适于三维FFBP成像的三维极坐标系，对三维FFBP中孔径划分问题、算法实现问题以及计算效率问题进行了分析。仿真结果验证了该算法，其成像效率可提高13.8倍。

Back projection algorithm is widely used in the radar imaging for its advantages of perfect focusing, motion compensation and high quality imaging for any data acquisition geometries. To reduce the computational burden of the 3D imaging, the 2D fast factorized back projection is extended to 3D FFBP based on the aperture factorizing principle in this paper. A new 3D polar coordinate system, which is suitable for 3D FFBP is established. The problems of the aperture factorizing, algorithm implementation and efficiency of 3D FFBP are comprehensive analyzed. The processing results of the synthetic data validate the 3D FFBP algorithm, resulting in a 13.8 times speedup in this simulation.

TN957.52

国家自然科学基金资助项目