High-Precision Spotlight SAR Imaging with Joint Modified Fast Factorized Backprojection and Autofocus
Fast factorized backprojection (FFBP) takes advantage of high accuracy of time-domain algorithms while also possessing high efficiency comparable with conventional frequency domain algorithms. When phase errors need to be compensated for high-resolution synthetic aperture radar (SAR) imaging, howeve...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | International Journal of Antennas and Propagation |
| Online Access: | http://dx.doi.org/10.1155/2020/2495050 |
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| _version_ | 1849397920491634688 |
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| author | Man Zhang Haolin Li Guanyong Wang |
| author_facet | Man Zhang Haolin Li Guanyong Wang |
| author_sort | Man Zhang |
| collection | DOAJ |
| description | Fast factorized backprojection (FFBP) takes advantage of high accuracy of time-domain algorithms while also possessing high efficiency comparable with conventional frequency domain algorithms. When phase errors need to be compensated for high-resolution synthetic aperture radar (SAR) imaging, however, neither polar formatted subimages within FFBP flow nor the final Cartesian image formed by FFBP is suitable for phase gradient autofocus (PGA). This is because these kinds of images are not capable of providing PGA with a clear Fourier transform relationship (FTR) between image domain and range-compressed phase history domain. In this paper, we make some essential modifications to the original FFBP and present a scheme to incorporate overlapped-subaperture frame for an accurate PGA processing. The raw data collected by an airborne high-resolution spotlight SAR are used to demonstrate the performance of this algorithm. |
| format | Article |
| id | doaj-art-a679450da88b41d08a15ee05d1219b01 |
| institution | Kabale University |
| issn | 1687-5869 1687-5877 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Antennas and Propagation |
| spelling | doaj-art-a679450da88b41d08a15ee05d1219b012025-08-20T03:38:48ZengWileyInternational Journal of Antennas and Propagation1687-58691687-58772020-01-01202010.1155/2020/24950502495050High-Precision Spotlight SAR Imaging with Joint Modified Fast Factorized Backprojection and AutofocusMan Zhang0Haolin Li1Guanyong Wang2School of Electronics and Communication Engineering, Guangzhou University, Guangzhou 510006, ChinaInstitute of Spacecraft Application System Engineering, CAST, Beijing 100094, ChinaBeijing Institute of Radio Measurement, Beijing 100854, ChinaFast factorized backprojection (FFBP) takes advantage of high accuracy of time-domain algorithms while also possessing high efficiency comparable with conventional frequency domain algorithms. When phase errors need to be compensated for high-resolution synthetic aperture radar (SAR) imaging, however, neither polar formatted subimages within FFBP flow nor the final Cartesian image formed by FFBP is suitable for phase gradient autofocus (PGA). This is because these kinds of images are not capable of providing PGA with a clear Fourier transform relationship (FTR) between image domain and range-compressed phase history domain. In this paper, we make some essential modifications to the original FFBP and present a scheme to incorporate overlapped-subaperture frame for an accurate PGA processing. The raw data collected by an airborne high-resolution spotlight SAR are used to demonstrate the performance of this algorithm.http://dx.doi.org/10.1155/2020/2495050 |
| spellingShingle | Man Zhang Haolin Li Guanyong Wang High-Precision Spotlight SAR Imaging with Joint Modified Fast Factorized Backprojection and Autofocus International Journal of Antennas and Propagation |
| title | High-Precision Spotlight SAR Imaging with Joint Modified Fast Factorized Backprojection and Autofocus |
| title_full | High-Precision Spotlight SAR Imaging with Joint Modified Fast Factorized Backprojection and Autofocus |
| title_fullStr | High-Precision Spotlight SAR Imaging with Joint Modified Fast Factorized Backprojection and Autofocus |
| title_full_unstemmed | High-Precision Spotlight SAR Imaging with Joint Modified Fast Factorized Backprojection and Autofocus |
| title_short | High-Precision Spotlight SAR Imaging with Joint Modified Fast Factorized Backprojection and Autofocus |
| title_sort | high precision spotlight sar imaging with joint modified fast factorized backprojection and autofocus |
| url | http://dx.doi.org/10.1155/2020/2495050 |
| work_keys_str_mv | AT manzhang highprecisionspotlightsarimagingwithjointmodifiedfastfactorizedbackprojectionandautofocus AT haolinli highprecisionspotlightsarimagingwithjointmodifiedfastfactorizedbackprojectionandautofocus AT guanyongwang highprecisionspotlightsarimagingwithjointmodifiedfastfactorizedbackprojectionandautofocus |