Phase Shift Migration with Modified Coherent Factor Algorithm for MIMO-SAR 3D Imaging in THz Band

In multiple-input-multiple-output synthetic aperture radar (MIMO-SAR) systems, sparse arrays are usually applied, resulting in increased sidelobes of the point spread function. In this paper, a phase shift migration (PSM) imaging algorithm based on the explosion reflection model with modified cohere...

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Autores principales:	Guan Yang, Chao Li, Shiyou Wu, Shen Zheng, Xiaojun Liu, Guangyou Fang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	sidelobe suppression algorithm multiple-input-multiple-output synthetic aperture radar phase shift migration terahertz band Science Q
Acceso en línea:	https://doaj.org/article/86c308bfb8144c03bbf5dd3967f8216f
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spelling	oai:doaj.org-article:86c308bfb8144c03bbf5dd3967f8216f2021-11-25T18:55:33ZPhase Shift Migration with Modified Coherent Factor Algorithm for MIMO-SAR 3D Imaging in THz Band10.3390/rs132247012072-4292https://doaj.org/article/86c308bfb8144c03bbf5dd3967f8216f2021-11-01T00:00:00Zhttps://www.mdpi.com/2072-4292/13/22/4701https://doaj.org/toc/2072-4292In multiple-input-multiple-output synthetic aperture radar (MIMO-SAR) systems, sparse arrays are usually applied, resulting in increased sidelobes of the point spread function. In this paper, a phase shift migration (PSM) imaging algorithm based on the explosion reflection model with modified coherent factor was proposed for sidelobe suppression in MIMO-SAR three-dimensional (3D) imaging application. By defining the virtual difference wavenumber, reconstructing the raw echo by data rearrangement in wavenumber domain, the original coherent factor algorithm operating in spatial domain can be achieved by the PSM algorithm frame in the wavenumber domain, which means two orders of magnitude increase in computational efficiency. The correctness of the theory is verified by simulation. Finally, a bistatic prototype imaging system in the 0.3 THz band was designed for the proof-of-principle experiments. The experimental results show that the proposed algorithm has a 0.948 structural similarity value to the original coherent factor back-projection algorithm (CF-BPA) which means comparable image quality with much superior efficiency.Guan YangChao LiShiyou WuShen ZhengXiaojun LiuGuangyou FangMDPI AGarticlesidelobe suppression algorithmmultiple-input-multiple-output synthetic aperture radarphase shift migrationterahertz bandScienceQENRemote Sensing, Vol 13, Iss 4701, p 4701 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	sidelobe suppression algorithm multiple-input-multiple-output synthetic aperture radar phase shift migration terahertz band Science Q
spellingShingle	sidelobe suppression algorithm multiple-input-multiple-output synthetic aperture radar phase shift migration terahertz band Science Q Guan Yang Chao Li Shiyou Wu Shen Zheng Xiaojun Liu Guangyou Fang Phase Shift Migration with Modified Coherent Factor Algorithm for MIMO-SAR 3D Imaging in THz Band
description	In multiple-input-multiple-output synthetic aperture radar (MIMO-SAR) systems, sparse arrays are usually applied, resulting in increased sidelobes of the point spread function. In this paper, a phase shift migration (PSM) imaging algorithm based on the explosion reflection model with modified coherent factor was proposed for sidelobe suppression in MIMO-SAR three-dimensional (3D) imaging application. By defining the virtual difference wavenumber, reconstructing the raw echo by data rearrangement in wavenumber domain, the original coherent factor algorithm operating in spatial domain can be achieved by the PSM algorithm frame in the wavenumber domain, which means two orders of magnitude increase in computational efficiency. The correctness of the theory is verified by simulation. Finally, a bistatic prototype imaging system in the 0.3 THz band was designed for the proof-of-principle experiments. The experimental results show that the proposed algorithm has a 0.948 structural similarity value to the original coherent factor back-projection algorithm (CF-BPA) which means comparable image quality with much superior efficiency.
format	article
author	Guan Yang Chao Li Shiyou Wu Shen Zheng Xiaojun Liu Guangyou Fang
author_facet	Guan Yang Chao Li Shiyou Wu Shen Zheng Xiaojun Liu Guangyou Fang
author_sort	Guan Yang
title	Phase Shift Migration with Modified Coherent Factor Algorithm for MIMO-SAR 3D Imaging in THz Band
title_short	Phase Shift Migration with Modified Coherent Factor Algorithm for MIMO-SAR 3D Imaging in THz Band
title_full	Phase Shift Migration with Modified Coherent Factor Algorithm for MIMO-SAR 3D Imaging in THz Band
title_fullStr	Phase Shift Migration with Modified Coherent Factor Algorithm for MIMO-SAR 3D Imaging in THz Band
title_full_unstemmed	Phase Shift Migration with Modified Coherent Factor Algorithm for MIMO-SAR 3D Imaging in THz Band
title_sort	phase shift migration with modified coherent factor algorithm for mimo-sar 3d imaging in thz band
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/86c308bfb8144c03bbf5dd3967f8216f
work_keys_str_mv	AT guanyang phaseshiftmigrationwithmodifiedcoherentfactoralgorithmformimosar3dimaginginthzband AT chaoli phaseshiftmigrationwithmodifiedcoherentfactoralgorithmformimosar3dimaginginthzband AT shiyouwu phaseshiftmigrationwithmodifiedcoherentfactoralgorithmformimosar3dimaginginthzband AT shenzheng phaseshiftmigrationwithmodifiedcoherentfactoralgorithmformimosar3dimaginginthzband AT xiaojunliu phaseshiftmigrationwithmodifiedcoherentfactoralgorithmformimosar3dimaginginthzband AT guangyoufang phaseshiftmigrationwithmodifiedcoherentfactoralgorithmformimosar3dimaginginthzband
_version_	1718410537353609216

Phase Shift Migration with Modified Coherent Factor Algorithm for MIMO-SAR 3D Imaging in THz Band

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