title: Efficient Terahertz Wide-Angle NUFFT-Based Inverse Synthetic Aperture Imaging Considering Spherical Wavefront.
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.
authors.affiliation: School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China. oscar92923@163.com.
authors.forename: Jingkun
authors.initials: J
authors.lastname: Gao
authors.affiliation: School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China. dengbin@nudt.edu.cn.
authors.forename: Bin
authors.initials: B
authors.lastname: Deng
authors.affiliation: School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China. qinyuliang@nudt.edu.cn.
authors.forename: Yuliang
authors.initials: Y
authors.lastname: Qin
authors.affiliation: School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China. oliverwhq@tom.com.
authors.forename: Hongqiang
authors.initials: H
authors.lastname: Wang
authors.affiliation: School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China. lixiang01@vip.sina.com.
authors.forename: Xiang
authors.initials: X
authors.lastname: Li
keywords: spherical wavefront; synthetic aperture imaging; terahertz imaging; wide-angle