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A Modified Keystone-Based Forward-Looking Arc Array Synthetic Aperture Radar 3D Imaging Method

An arc array synthetic aperture radar (AA-SAR) is a new type of omnidirectional observation and imaging system. Based on linear array 3D imaging, this paper introduces a keystone algorithm combined with the arc array SAR 2D imaging method and proposes a modified 3D imaging algorithm based on keyston...

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Detalles Bibliográficos
Autores principales: Zhu, Xiaofan, Huang, Pingping, Xu, Wei, Tan, Weixian, Qi, Yaolong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10006887/
https://www.ncbi.nlm.nih.gov/pubmed/36904878
http://dx.doi.org/10.3390/s23052674
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author Zhu, Xiaofan
Huang, Pingping
Xu, Wei
Tan, Weixian
Qi, Yaolong
author_facet Zhu, Xiaofan
Huang, Pingping
Xu, Wei
Tan, Weixian
Qi, Yaolong
author_sort Zhu, Xiaofan
collection PubMed
description An arc array synthetic aperture radar (AA-SAR) is a new type of omnidirectional observation and imaging system. Based on linear array 3D imaging, this paper introduces a keystone algorithm combined with the arc array SAR 2D imaging method and proposes a modified 3D imaging algorithm based on keystone transformation. The first step is to discuss the target azimuth angle, retain the far-field approximation method of the first-order term, analyze the influence of the forward motion of the platform on the along-track position, and realize the two-dimensional focusing of the target slant range–azimuth direction. The second step is to redefine a new azimuth angle variable in the slant-range along-track imaging and use the keystone-based processing algorithm in the range frequency domain to eliminate the coupling term generated by the array angle and the slant-range time. The corrected data are used to perform along-track pulse compression to obtain the focused image of the target and realize the three-dimensional imaging of the target. Finally, in this article, the spatial resolution of the AA-SAR system in the forward-looking state is analyzed in detail, and the change in the spatial resolution of the system and the effectiveness of the algorithm are verified through simulation.
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spelling pubmed-100068872023-03-12 A Modified Keystone-Based Forward-Looking Arc Array Synthetic Aperture Radar 3D Imaging Method Zhu, Xiaofan Huang, Pingping Xu, Wei Tan, Weixian Qi, Yaolong Sensors (Basel) Article An arc array synthetic aperture radar (AA-SAR) is a new type of omnidirectional observation and imaging system. Based on linear array 3D imaging, this paper introduces a keystone algorithm combined with the arc array SAR 2D imaging method and proposes a modified 3D imaging algorithm based on keystone transformation. The first step is to discuss the target azimuth angle, retain the far-field approximation method of the first-order term, analyze the influence of the forward motion of the platform on the along-track position, and realize the two-dimensional focusing of the target slant range–azimuth direction. The second step is to redefine a new azimuth angle variable in the slant-range along-track imaging and use the keystone-based processing algorithm in the range frequency domain to eliminate the coupling term generated by the array angle and the slant-range time. The corrected data are used to perform along-track pulse compression to obtain the focused image of the target and realize the three-dimensional imaging of the target. Finally, in this article, the spatial resolution of the AA-SAR system in the forward-looking state is analyzed in detail, and the change in the spatial resolution of the system and the effectiveness of the algorithm are verified through simulation. MDPI 2023-02-28 /pmc/articles/PMC10006887/ /pubmed/36904878 http://dx.doi.org/10.3390/s23052674 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zhu, Xiaofan
Huang, Pingping
Xu, Wei
Tan, Weixian
Qi, Yaolong
A Modified Keystone-Based Forward-Looking Arc Array Synthetic Aperture Radar 3D Imaging Method
title A Modified Keystone-Based Forward-Looking Arc Array Synthetic Aperture Radar 3D Imaging Method
title_full A Modified Keystone-Based Forward-Looking Arc Array Synthetic Aperture Radar 3D Imaging Method
title_fullStr A Modified Keystone-Based Forward-Looking Arc Array Synthetic Aperture Radar 3D Imaging Method
title_full_unstemmed A Modified Keystone-Based Forward-Looking Arc Array Synthetic Aperture Radar 3D Imaging Method
title_short A Modified Keystone-Based Forward-Looking Arc Array Synthetic Aperture Radar 3D Imaging Method
title_sort modified keystone-based forward-looking arc array synthetic aperture radar 3d imaging method
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10006887/
https://www.ncbi.nlm.nih.gov/pubmed/36904878
http://dx.doi.org/10.3390/s23052674
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