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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。
The backward projection algorithm has the advantages of accurate imaging, easy compensation, suitable for a variety of array configurations and signal forms, and is widely used in the field of radar imaging. Aiming at the problem of low computational efficiency in 3D imaging, this paper extends the two-dimensional fast factorized back projection (FFBP) to three-dimensional imaging by means of aperture block, and establishes a new algorithm for three-dimensional FFBP imaging Dimensional polar coordinate system, the problem of aperture classification, algorithm implementation and computational efficiency in three-dimensional FFBP is analyzed. Simulation results verify the algorithm, the imaging efficiency can be increased by 13.8 times.