High-Resolution Squinted SAR Imaging Algorithm Applied in the Near-Field Environment
In the squinted synthetic aperture radar (SAR) imaging of the near-field environment, range-dependent characteristic of squint angle cannot be ignored, which causes azimuth-dependent range cell migration (RCM) after linear range walk correction (LRWC). In this study, an efficient SAR imaging algorit...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Complexity |
| Online Access: | http://dx.doi.org/10.1155/2020/1647957 |
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| author | Shijia Wang Shibo Wang Wanli Liu |
| author_facet | Shijia Wang Shibo Wang Wanli Liu |
| author_sort | Shijia Wang |
| collection | DOAJ |
| description | In the squinted synthetic aperture radar (SAR) imaging of the near-field environment, range-dependent characteristic of squint angle cannot be ignored, which causes azimuth-dependent range cell migration (RCM) after linear range walk correction (LRWC). In this study, an efficient SAR imaging algorithm applied in the near-field environment is proposed. In the processing of the range focusing, LRWC is firstly used to remove the linear RCM. Then, the residual LRCM is expanded into azimuth-invariant and azimuth-variant terms in consideration of the residual LRCM of azimuth-dependent. Range cell migration azimuth scaling (RCMAS) is designed to remove the azimuth-variant term before secondary range compression (SRC) and range compression (RC). In the azimuth focusing, azimuth distortion compensation (ADC) is performed to compensate the azimuth distortion, following which azimuth nonlinear chirp scaling (ANCS) is applied to equalize the frequency modulation (FM) rate for azimuth compression (AC). The simulated results show that more accurate and improved imaging result can be obtained with the proposed algorithm. |
| format | Article |
| id | doaj-art-c77286bd08834537ae48a59fd6d928eb |
| institution | DOAJ |
| issn | 1076-2787 1099-0526 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Complexity |
| spelling | doaj-art-c77286bd08834537ae48a59fd6d928eb2025-08-20T03:22:57ZengWileyComplexity1076-27871099-05262020-01-01202010.1155/2020/16479571647957High-Resolution Squinted SAR Imaging Algorithm Applied in the Near-Field EnvironmentShijia Wang0Shibo Wang1Wanli Liu2School of Mechanical and Electronic Engineering, China University of Mining and Technology, Xuzhou, ChinaSchool of Mechanical and Electronic Engineering, China University of Mining and Technology, Xuzhou, ChinaSchool of Mechanical and Electronic Engineering, China University of Mining and Technology, Xuzhou, ChinaIn the squinted synthetic aperture radar (SAR) imaging of the near-field environment, range-dependent characteristic of squint angle cannot be ignored, which causes azimuth-dependent range cell migration (RCM) after linear range walk correction (LRWC). In this study, an efficient SAR imaging algorithm applied in the near-field environment is proposed. In the processing of the range focusing, LRWC is firstly used to remove the linear RCM. Then, the residual LRCM is expanded into azimuth-invariant and azimuth-variant terms in consideration of the residual LRCM of azimuth-dependent. Range cell migration azimuth scaling (RCMAS) is designed to remove the azimuth-variant term before secondary range compression (SRC) and range compression (RC). In the azimuth focusing, azimuth distortion compensation (ADC) is performed to compensate the azimuth distortion, following which azimuth nonlinear chirp scaling (ANCS) is applied to equalize the frequency modulation (FM) rate for azimuth compression (AC). The simulated results show that more accurate and improved imaging result can be obtained with the proposed algorithm.http://dx.doi.org/10.1155/2020/1647957 |
| spellingShingle | Shijia Wang Shibo Wang Wanli Liu High-Resolution Squinted SAR Imaging Algorithm Applied in the Near-Field Environment Complexity |
| title | High-Resolution Squinted SAR Imaging Algorithm Applied in the Near-Field Environment |
| title_full | High-Resolution Squinted SAR Imaging Algorithm Applied in the Near-Field Environment |
| title_fullStr | High-Resolution Squinted SAR Imaging Algorithm Applied in the Near-Field Environment |
| title_full_unstemmed | High-Resolution Squinted SAR Imaging Algorithm Applied in the Near-Field Environment |
| title_short | High-Resolution Squinted SAR Imaging Algorithm Applied in the Near-Field Environment |
| title_sort | high resolution squinted sar imaging algorithm applied in the near field environment |
| url | http://dx.doi.org/10.1155/2020/1647957 |
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