Three-dimensional terahertz-wave holographic imaging based on mixed-domain reconstruction algorithm
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摘要: 提出了一种三维混合域重建算法，该算法在垂直方位向采用空间波数域匹配滤波，结合距离水平方位域后向投影技术完成目标三维重建。与三维波数域算法相比，该算法不仅避免了复杂的三维Stolt插值，还继承了后向投影技术便于处理运动补偿的优点。相比传统的三维时域后向投影算法，该算法通过在垂直方位向的波数域处理，运算量显著减少。通过对0.2 THz波段仿真和实验数据的重建，验证了算法的正确性和有效性。Abstract: A three-dimensional (3-D) image reconstruction algorithm based on mixed-domain is developed for terahertz holographic imager. Matched filtering in the spatial wave-number domain is employed to focus images in the vertical direction. Combined with back-projection technique used in the other two directions, the algorithm can focus images perfectly without complex 3-D Stolt interpolation computation compared with the frequency-wavenumber algorithm. Besides, motion compensations in the horizontal and range directions get easier to handle. The computational cost of the proposed algorithm is lower than the traditional 3-D back-projection algorithm owing to the FFT-based reconstruction in the vertical direction. Finally, some simulation and experimental imaging results are given in the 0.2 THz band to validate the algorithm.
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