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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...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
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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. |
format | Online Article Text |
id | pubmed-10006887 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
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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