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Sensors 2016, 16(12), 2120; doi:10.3390/s16122120

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

School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
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Academic Editor: Jason K. Levy
Received: 29 October 2016 / Revised: 6 December 2016 / Accepted: 9 December 2016 / Published: 14 December 2016
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Abstract

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. View Full-Text
Keywords: spherical wavefront; wide-angle; terahertz imaging; synthetic aperture imaging spherical wavefront; wide-angle; terahertz imaging; synthetic aperture imaging
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MDPI and ACS Style

Gao, J.; Deng, B.; Qin, Y.; Wang, H.; Li, X. Efficient Terahertz Wide-Angle NUFFT-Based Inverse Synthetic Aperture Imaging Considering Spherical Wavefront. Sensors 2016, 16, 2120.

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