title: A High Precision Terahertz Wave Image Reconstruction Algorithm.
abstract: With the development of terahertz (THz) technology, the applications of this spectrum have become increasingly wide-ranging, in areas such as non-destructive testing, security applications and medical scanning, in which one of the most important methods is imaging. Unlike remote sensing applications, THz imaging features sources of array elements that are almost always supposed to be spherical wave radiators, including single antennae. As such, well-developed methodologies such as Range-Doppler Algorithm (RDA) are not directly applicable in such near-range situations. The Back Projection Algorithm (BPA) can provide products of high precision at the the cost of a high computational burden, while the Range Migration Algorithm (RMA) sacrifices the quality of images for efficiency. The Phase-shift Migration Algorithm (PMA) is a good alternative, the features of which combine both of the classical algorithms mentioned above. In this research, it is used for mechanical scanning, and is extended to array imaging for the first time. In addition, the performances of PMA are studied in detail in contrast to BPA and RMA. It is demonstrated in our simulations and experiments described herein that the algorithm can reconstruct images with high precision.
authors.affiliation: School of Instrumentation Science and Electrical Engineering, Jilin University, Changchun 130012, China. gqj2013@gmail.com.
authors.forename: Qijia
authors.initials: Q
authors.lastname: Guo
authors.affiliation: School of Instrumentation Science and Electrical Engineering, Jilin University, Changchun 130012, China. tchang@jlu.edu.cn.|Institute of Automation, Shandong Academy of Sciences, Jinan 250014, China. tchang@jlu.edu.cn.
authors.forename: Tianying
authors.initials: T
authors.lastname: Chang
authors.affiliation: School of Instrumentation Science and Electrical Engineering, Jilin University, Changchun 130012, China. genggs@foxmail.com.
authors.forename: Guoshuai
authors.initials: G
authors.lastname: Geng
authors.affiliation: School of Instrumentation Science and Electrical Engineering, Jilin University, Changchun 130012, China. chengyan_jia@163.com.
authors.forename: Chengyan
authors.initials: C
authors.lastname: Jia
authors.affiliation: School of Instrumentation Science and Electrical Engineering, Jilin University, Changchun 130012, China. hcui@jlu.edu.cn.
authors.forename: Hong-Liang
authors.initials: HL
authors.lastname: Cui
keywords: Phase-shift Migration Algorithm; high precision image reconstruction; terahertz wave image