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Efficient Terahertz Wide-Angle NUFFT-Based Inverse Synthetic Aperture Imaging Considering Spherical Wavefront

机译:考虑球面波前的高效太赫兹广角基于NUFFT的逆合成孔径成像

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摘要

An efficient wide-angle inverse synthetic aperture imaging method considering the spherical wavefront effects and suitable for the terahertz band is presented. Firstly, the echo signal model under spherical wave assumption is established, and the detailed wavefront curvature compensation method accelerated by 1D fast Fourier transform (FFT) is discussed. Then, to speed up the reconstruction procedure, the fast Gaussian gridding (FGG)-based nonuniform FFT (NUFFT) is employed to focus the image. Finally, proof-of-principle experiments are carried out and the results are compared with the ones obtained by the convolution back-projection (CBP) algorithm. The results demonstrate the effectiveness and the efficiency of the presented method. This imaging method can be directly used in the field of nondestructive detection and can also be used to provide a solution for the calculation of the far-field RCSs (Radar Cross Section) of targets in the terahertz regime.
机译:提出了一种考虑球面波阵面效应并适用于太赫兹波段的高效广角逆合成孔径成像方法。首先,建立了在球形波假设下的回波信号模型,并讨论了由一维快速傅里叶变换(FFT)加速的详细波前曲率补偿方法。然后,为了加快重建过程,采用了基于快速高斯网格(FGG)的非均匀FFT(NUFFT)来聚焦图像。最后,进行了原理验证实验,并将结果与​​通过卷积反投影(CBP)算法获得的结果进行了比较。结果证明了该方法的有效性和效率。这种成像方法可以直接用于无损检测领域,也可以为太赫兹状态下目标的远场RCS(雷达横截面)的计算提供解决方案。

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