Extended Polar Format Algorithm (EPFA) for High-Resolution Highly Squinted SAR
The conventional polar format algorithm (CPFA) is widely used for synthetic aperture radar (SAR) because of its simple and efficient operations. However, due to its wavefront curvature assumption, the CPFA’s depth-of-focus (DOF) is extremely small, which greatly limits the scene size, especially for...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-01-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/15/2/456 |
| _version_ | 1797437419397578752 |
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| author | Ping Guo Fuen Wu Anyi Wang |
| author_facet | Ping Guo Fuen Wu Anyi Wang |
| author_sort | Ping Guo |
| collection | DOAJ |
| description | The conventional polar format algorithm (CPFA) is widely used for synthetic aperture radar (SAR) because of its simple and efficient operations. However, due to its wavefront curvature assumption, the CPFA’s depth-of-focus (DOF) is extremely small, which greatly limits the scene size, especially for high-resolution and highly squinted (HRHS) SAR. To solve this problem, an extended PFA (EPFA) is proposed in this study, re-deriving mapping functions by expanding the range history into slant- and cross-range components according to the forms of real data storage. This allows the full use of storage data, which the CPFA cannot achieve due to the large approximations introduced by the projection of echo data onto the ground. The wavefront curvature error is then analyzed and eliminated using a space-variant phase compensation function. Due to the high accuracy of expansion in the slant range plane and the space-variant correction processing, the EPFA has a larger DOF than the CPFA. The EPFA is also more suitable for undulating terrains since it avoids the projection of real data onto the ground plane performed in the CPFA. Using comparative analyses of simulated data and real-world images, the results suggest that the proposed EPFA achieves better focusing effects than the CPFA and is particularly useful for HRHS SAR. |
| first_indexed | 2024-03-09T11:20:03Z |
| format | Article |
| id | doaj.art-3e826d1604b547ceb9d8ad86d028dfcd |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-09T11:20:03Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-3e826d1604b547ceb9d8ad86d028dfcd2023-12-01T00:21:08ZengMDPI AGRemote Sensing2072-42922023-01-0115245610.3390/rs15020456Extended Polar Format Algorithm (EPFA) for High-Resolution Highly Squinted SARPing Guo0Fuen Wu1Anyi Wang2Xi’an Key Laboratory of Network Convergence Communication, Xi’an University of Science and Technology, Xi’an 710054, ChinaXi’an Key Laboratory of Network Convergence Communication, Xi’an University of Science and Technology, Xi’an 710054, ChinaXi’an Key Laboratory of Network Convergence Communication, Xi’an University of Science and Technology, Xi’an 710054, ChinaThe conventional polar format algorithm (CPFA) is widely used for synthetic aperture radar (SAR) because of its simple and efficient operations. However, due to its wavefront curvature assumption, the CPFA’s depth-of-focus (DOF) is extremely small, which greatly limits the scene size, especially for high-resolution and highly squinted (HRHS) SAR. To solve this problem, an extended PFA (EPFA) is proposed in this study, re-deriving mapping functions by expanding the range history into slant- and cross-range components according to the forms of real data storage. This allows the full use of storage data, which the CPFA cannot achieve due to the large approximations introduced by the projection of echo data onto the ground. The wavefront curvature error is then analyzed and eliminated using a space-variant phase compensation function. Due to the high accuracy of expansion in the slant range plane and the space-variant correction processing, the EPFA has a larger DOF than the CPFA. The EPFA is also more suitable for undulating terrains since it avoids the projection of real data onto the ground plane performed in the CPFA. Using comparative analyses of simulated data and real-world images, the results suggest that the proposed EPFA achieves better focusing effects than the CPFA and is particularly useful for HRHS SAR.https://www.mdpi.com/2072-4292/15/2/456high-resolution and highly squinted (HRHS)extended polar format algorithm (EPFA)slant range planewavefront curvature error |
| spellingShingle | Ping Guo Fuen Wu Anyi Wang Extended Polar Format Algorithm (EPFA) for High-Resolution Highly Squinted SAR Remote Sensing high-resolution and highly squinted (HRHS) extended polar format algorithm (EPFA) slant range plane wavefront curvature error |
| title | Extended Polar Format Algorithm (EPFA) for High-Resolution Highly Squinted SAR |
| title_full | Extended Polar Format Algorithm (EPFA) for High-Resolution Highly Squinted SAR |
| title_fullStr | Extended Polar Format Algorithm (EPFA) for High-Resolution Highly Squinted SAR |
| title_full_unstemmed | Extended Polar Format Algorithm (EPFA) for High-Resolution Highly Squinted SAR |
| title_short | Extended Polar Format Algorithm (EPFA) for High-Resolution Highly Squinted SAR |
| title_sort | extended polar format algorithm epfa for high resolution highly squinted sar |
| topic | high-resolution and highly squinted (HRHS) extended polar format algorithm (EPFA) slant range plane wavefront curvature error |
| url | https://www.mdpi.com/2072-4292/15/2/456 |
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