On the Role of Scene Coordinate System in Focusing of GEO SAR Data With Fast Time-Domain Algorithm
Geosynchronous-Earth-orbit (GEO) synthetic aperture radar (SAR) is able to achieve targeted observation, thanks to its flexibility in antenna steering, while focusing GEO SAR data is challenging due to the highly dynamic imaging geometry. Its processing algorithm is required to be able to deal with...
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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/10801218/ |
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| _version_ | 1841536171286462464 |
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| author | Wenkang Liu Hang Li Jinsong Zhang Guang-Cai Sun Hongxu Bian Jixiang Xiang Mengdao Xing |
| author_facet | Wenkang Liu Hang Li Jinsong Zhang Guang-Cai Sun Hongxu Bian Jixiang Xiang Mengdao Xing |
| author_sort | Wenkang Liu |
| collection | DOAJ |
| description | Geosynchronous-Earth-orbit (GEO) synthetic aperture radar (SAR) is able to achieve targeted observation, thanks to its flexibility in antenna steering, while focusing GEO SAR data is challenging due to the highly dynamic imaging geometry. Its processing algorithm is required to be able to deal with different view angles at different orbit segments, and the non-Euclidean scene geometry must be considered in the algorithm model and processing chain. This article focuses on developing the processing algorithm applicable to the GEO SAR, especially at high squint. The analytic expressions of the squint-mode wavenumber support and point spreading function are derived. Then, we propose a generalized fast Cartesian factorized back-projection algorithm, which can deal with high-squint data, and the scene coordinate system can be built with high flexibility. Especially, the role of the scene coordinate system in achieving high imaging performance is studied, and the optimal scene coordinate system is exploited. Finally, the processing results of simulated point target data are presented to validate the proposed algorithm. |
| format | Article |
| id | doaj-art-4ed738ad8cb049059d8c62ca2ebb39a5 |
| 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-4ed738ad8cb049059d8c62ca2ebb39a52025-01-15T00:00:20ZengIEEEIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing1939-14042151-15352025-01-01182355236910.1109/JSTARS.2024.351766510801218On the Role of Scene Coordinate System in Focusing of GEO SAR Data With Fast Time-Domain AlgorithmWenkang Liu0https://orcid.org/0000-0002-4880-0897Hang Li1Jinsong Zhang2https://orcid.org/0000-0002-1004-7721Guang-Cai Sun3https://orcid.org/0000-0002-6482-0863Hongxu Bian4Jixiang Xiang5https://orcid.org/0000-0002-8187-4927Mengdao Xing6https://orcid.org/0000-0002-4084-0915Academy of Advanced Interdisciplinary Research, Xidian University, Xi'an, ChinaShaanxi Huanghe Group Company, Ltd., Xi'an, ChinaAcademy of Advanced Interdisciplinary Research, Xidian University, Xi'an, ChinaNational Key Laboratory of Radar Signal Processing, Xidian University, Xi'an, ChinaNational Key Laboratory of Radar Signal Processing, Xidian University, Xi'an, ChinaAcademy of Advanced Interdisciplinary Research, Xidian University, Xi'an, ChinaAcademy of Advanced Interdisciplinary Research, Xidian University, Xi'an, ChinaGeosynchronous-Earth-orbit (GEO) synthetic aperture radar (SAR) is able to achieve targeted observation, thanks to its flexibility in antenna steering, while focusing GEO SAR data is challenging due to the highly dynamic imaging geometry. Its processing algorithm is required to be able to deal with different view angles at different orbit segments, and the non-Euclidean scene geometry must be considered in the algorithm model and processing chain. This article focuses on developing the processing algorithm applicable to the GEO SAR, especially at high squint. The analytic expressions of the squint-mode wavenumber support and point spreading function are derived. Then, we propose a generalized fast Cartesian factorized back-projection algorithm, which can deal with high-squint data, and the scene coordinate system can be built with high flexibility. Especially, the role of the scene coordinate system in achieving high imaging performance is studied, and the optimal scene coordinate system is exploited. Finally, the processing results of simulated point target data are presented to validate the proposed algorithm.https://ieeexplore.ieee.org/document/10801218/Dynamic observation geometrygeosynchronous-Earth-orbit (GEO) synthetic aperture radar (SAR)high squintnon-Euclidean scene geometryscene coordinate system |
| spellingShingle | Wenkang Liu Hang Li Jinsong Zhang Guang-Cai Sun Hongxu Bian Jixiang Xiang Mengdao Xing On the Role of Scene Coordinate System in Focusing of GEO SAR Data With Fast Time-Domain Algorithm IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing Dynamic observation geometry geosynchronous-Earth-orbit (GEO) synthetic aperture radar (SAR) high squint non-Euclidean scene geometry scene coordinate system |
| title | On the Role of Scene Coordinate System in Focusing of GEO SAR Data With Fast Time-Domain Algorithm |
| title_full | On the Role of Scene Coordinate System in Focusing of GEO SAR Data With Fast Time-Domain Algorithm |
| title_fullStr | On the Role of Scene Coordinate System in Focusing of GEO SAR Data With Fast Time-Domain Algorithm |
| title_full_unstemmed | On the Role of Scene Coordinate System in Focusing of GEO SAR Data With Fast Time-Domain Algorithm |
| title_short | On the Role of Scene Coordinate System in Focusing of GEO SAR Data With Fast Time-Domain Algorithm |
| title_sort | on the role of scene coordinate system in focusing of geo sar data with fast time domain algorithm |
| topic | Dynamic observation geometry geosynchronous-Earth-orbit (GEO) synthetic aperture radar (SAR) high squint non-Euclidean scene geometry scene coordinate system |
| url | https://ieeexplore.ieee.org/document/10801218/ |
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