Ultrahigh Resolution ISAR Imaging of a Target With Unknown and Complex Motion Using SA-NCS Algorithm
In this manuscript, a novel inverse synthetic aperture radar (ISAR) imaging method for a large target under ultrahigh resolution condition is proposed. Certain problems in the existing ISAR imaging algorithms for ultrahigh resolution imagery are discussed. The problems caused by Keystone Transform u...
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| Format: | Article |
| Language: | English |
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IEEE
2025-01-01
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| Series: | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
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| Online Access: | https://ieeexplore.ieee.org/document/10827822/ |
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| _version_ | 1832586891588796416 |
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| author | Yuexin Gao Hanwen Yu Min Xue Jianlai Chen |
| author_facet | Yuexin Gao Hanwen Yu Min Xue Jianlai Chen |
| author_sort | Yuexin Gao |
| collection | DOAJ |
| description | In this manuscript, a novel inverse synthetic aperture radar (ISAR) imaging method for a large target under ultrahigh resolution condition is proposed. Certain problems in the existing ISAR imaging algorithms for ultrahigh resolution imagery are discussed. The problems caused by Keystone Transform under the condition of large bandwidth and long coherent processing interval are analyzed. Moreover, various means of focusing the signals with polynomial phase are analyzed as well. In order to solve these problems, the sub-aperture nonlinear chirp scaling (NCS) algorithm is presented. This algorithm divides the data in range-frequency/azimuth-time domain into several blocks. In each block, a modified NCS algorithm is applied to estimate the rotation parameters. The modified NCS algorithm takes the residual phase errors arising from NCS processing into consideration. It can achieve a better-focusing quality without bringing about too much additional computation burden. The proposed method is applied to acquired data, whose processing results are much better in comparison with the certain algorithm. These experiments validate the effectiveness of the proposed algorithm. |
| format | Article |
| id | doaj-art-d5a3c76e49204056a74cebc580c43baa |
| institution | Kabale University |
| issn | 1939-1404 2151-1535 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
| spelling | doaj-art-d5a3c76e49204056a74cebc580c43baa2025-01-25T00:00:08ZengIEEEIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing1939-14042151-15352025-01-01183671368510.1109/JSTARS.2025.352577410827822Ultrahigh Resolution ISAR Imaging of a Target With Unknown and Complex Motion Using SA-NCS AlgorithmYuexin Gao0https://orcid.org/0000-0002-6371-7581Hanwen Yu1https://orcid.org/0000-0001-5057-2072Min Xue2Jianlai Chen3https://orcid.org/0000-0002-8639-9336School of Aerospace Science and Technology, Xidian University, Xi'an, ChinaSchool of Resources and Environment, University of Electronic Science and Technology of China, Chengdu, ChinaNational Laboratory of Radar Signal Processing, Xidian University, Xi'an, ChinaSchool of Automation, Central South University, Changsha, ChinaIn this manuscript, a novel inverse synthetic aperture radar (ISAR) imaging method for a large target under ultrahigh resolution condition is proposed. Certain problems in the existing ISAR imaging algorithms for ultrahigh resolution imagery are discussed. The problems caused by Keystone Transform under the condition of large bandwidth and long coherent processing interval are analyzed. Moreover, various means of focusing the signals with polynomial phase are analyzed as well. In order to solve these problems, the sub-aperture nonlinear chirp scaling (NCS) algorithm is presented. This algorithm divides the data in range-frequency/azimuth-time domain into several blocks. In each block, a modified NCS algorithm is applied to estimate the rotation parameters. The modified NCS algorithm takes the residual phase errors arising from NCS processing into consideration. It can achieve a better-focusing quality without bringing about too much additional computation burden. The proposed method is applied to acquired data, whose processing results are much better in comparison with the certain algorithm. These experiments validate the effectiveness of the proposed algorithm.https://ieeexplore.ieee.org/document/10827822/Inverse synthetic aperture radar (ISAR)modified nonlinear chirp scaling (NCS)sub-apertureultrahigh resolution imaging |
| spellingShingle | Yuexin Gao Hanwen Yu Min Xue Jianlai Chen Ultrahigh Resolution ISAR Imaging of a Target With Unknown and Complex Motion Using SA-NCS Algorithm IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing Inverse synthetic aperture radar (ISAR) modified nonlinear chirp scaling (NCS) sub-aperture ultrahigh resolution imaging |
| title | Ultrahigh Resolution ISAR Imaging of a Target With Unknown and Complex Motion Using SA-NCS Algorithm |
| title_full | Ultrahigh Resolution ISAR Imaging of a Target With Unknown and Complex Motion Using SA-NCS Algorithm |
| title_fullStr | Ultrahigh Resolution ISAR Imaging of a Target With Unknown and Complex Motion Using SA-NCS Algorithm |
| title_full_unstemmed | Ultrahigh Resolution ISAR Imaging of a Target With Unknown and Complex Motion Using SA-NCS Algorithm |
| title_short | Ultrahigh Resolution ISAR Imaging of a Target With Unknown and Complex Motion Using SA-NCS Algorithm |
| title_sort | ultrahigh resolution isar imaging of a target with unknown and complex motion using sa ncs algorithm |
| topic | Inverse synthetic aperture radar (ISAR) modified nonlinear chirp scaling (NCS) sub-aperture ultrahigh resolution imaging |
| url | https://ieeexplore.ieee.org/document/10827822/ |
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