A Review of Spaceborne High-Resolution Spotlight/Sliding Spotlight Mode SAR Imaging
Spotlight/sliding spotlight modes can achieve higher resolution than the other imaging modes and are widely used in object detection and recognition applications. This paper reviews the progress of the spaceborne spotlight/sliding spotlight SAR imaging field. The three steps of the current spaceborn...
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MDPI AG
2024-12-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/17/1/38 |
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| author | Baolong Wu Chengjin Liu Jianlai Chen |
| author_facet | Baolong Wu Chengjin Liu Jianlai Chen |
| author_sort | Baolong Wu |
| collection | DOAJ |
| description | Spotlight/sliding spotlight modes can achieve higher resolution than the other imaging modes and are widely used in object detection and recognition applications. This paper reviews the progress of the spaceborne spotlight/sliding spotlight SAR imaging field. The three steps of the current spaceborne spotlight/sliding spotlight SAR imaging algorithm framework are discussed in this paper. These include the following: eliminating the azimuth spectral aliasing by azimuth deramp preprocessing; implementing imaging processing using imaging kernels (RD, CS, RMA, etc.); and degrading the back-folded phenomenon in the final focused image domain by reference function multiplication post-processing. The different imaging kernels, consisting of RD, CS, RMA, BAS, FS, and PFA, are presented. The phase errors in high-resolution spaceborne spotlight/sliding spotlight SAR imaging, especially the stop-and-go error, curved orbit error, and tropospheric delay error, are analyzed in detail. Furthermore, the autofocus methods are described. In addition, some new imaging SAR systems based on spotlight/sliding spotlight SAR mode, which have more advantages than the classic spaceborne spotlight/sliding spotlight SAR imaging, were shown in this paper. These include FMCW-based systems, multichannel systems, varying-PRF systems, and bistatic systems. |
| format | Article |
| id | doaj-art-ea4961ab2a6f4cea99182c9eaea61bff |
| institution | Kabale University |
| issn | 2072-4292 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj-art-ea4961ab2a6f4cea99182c9eaea61bff2025-01-10T13:20:01ZengMDPI AGRemote Sensing2072-42922024-12-011713810.3390/rs17010038A Review of Spaceborne High-Resolution Spotlight/Sliding Spotlight Mode SAR ImagingBaolong Wu0Chengjin Liu1Jianlai Chen2School of Electronics and Information, Northwestern Polytechnical University, Xi’an 710072, ChinaSchool of Electronics and Information, Northwestern Polytechnical University, Xi’an 710072, ChinaSchool of Automation, Central South University, Changsha 410083, ChinaSpotlight/sliding spotlight modes can achieve higher resolution than the other imaging modes and are widely used in object detection and recognition applications. This paper reviews the progress of the spaceborne spotlight/sliding spotlight SAR imaging field. The three steps of the current spaceborne spotlight/sliding spotlight SAR imaging algorithm framework are discussed in this paper. These include the following: eliminating the azimuth spectral aliasing by azimuth deramp preprocessing; implementing imaging processing using imaging kernels (RD, CS, RMA, etc.); and degrading the back-folded phenomenon in the final focused image domain by reference function multiplication post-processing. The different imaging kernels, consisting of RD, CS, RMA, BAS, FS, and PFA, are presented. The phase errors in high-resolution spaceborne spotlight/sliding spotlight SAR imaging, especially the stop-and-go error, curved orbit error, and tropospheric delay error, are analyzed in detail. Furthermore, the autofocus methods are described. In addition, some new imaging SAR systems based on spotlight/sliding spotlight SAR mode, which have more advantages than the classic spaceborne spotlight/sliding spotlight SAR imaging, were shown in this paper. These include FMCW-based systems, multichannel systems, varying-PRF systems, and bistatic systems.https://www.mdpi.com/2072-4292/17/1/38synthetic aperture radarspaceborne high-resolution SARspotlight SARsliding spotlight SAR |
| spellingShingle | Baolong Wu Chengjin Liu Jianlai Chen A Review of Spaceborne High-Resolution Spotlight/Sliding Spotlight Mode SAR Imaging Remote Sensing synthetic aperture radar spaceborne high-resolution SAR spotlight SAR sliding spotlight SAR |
| title | A Review of Spaceborne High-Resolution Spotlight/Sliding Spotlight Mode SAR Imaging |
| title_full | A Review of Spaceborne High-Resolution Spotlight/Sliding Spotlight Mode SAR Imaging |
| title_fullStr | A Review of Spaceborne High-Resolution Spotlight/Sliding Spotlight Mode SAR Imaging |
| title_full_unstemmed | A Review of Spaceborne High-Resolution Spotlight/Sliding Spotlight Mode SAR Imaging |
| title_short | A Review of Spaceborne High-Resolution Spotlight/Sliding Spotlight Mode SAR Imaging |
| title_sort | review of spaceborne high resolution spotlight sliding spotlight mode sar imaging |
| topic | synthetic aperture radar spaceborne high-resolution SAR spotlight SAR sliding spotlight SAR |
| url | https://www.mdpi.com/2072-4292/17/1/38 |
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