A High-Resolution Airborne SAR Autofocusing Approach Based on SR-PGA and Subimage Resampling With Precise Hyperbolic Model
High-resolution airborne synthetic aperture radar imaging requires long synthetic aperture time (LSAT). However, the LSAT invalidates the Fresnel approximation in the traditional autofocusing method, leaving a residual signal phase in the motion error. To solve the problem, a signal-reconstruction-b...
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| Format: | Article |
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IEEE
2023-01-01
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| Series: | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/10032728/ |
| _version_ | 1811160942275198976 |
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| author | Yuhui Deng Hui Wang Guang-Cai Sun Yong Wang Wenkang Liu Jun Yang Mengdao Xing |
| author_facet | Yuhui Deng Hui Wang Guang-Cai Sun Yong Wang Wenkang Liu Jun Yang Mengdao Xing |
| author_sort | Yuhui Deng |
| collection | DOAJ |
| description | High-resolution airborne synthetic aperture radar imaging requires long synthetic aperture time (LSAT). However, the LSAT invalidates the Fresnel approximation in the traditional autofocusing method, leaving a residual signal phase in the motion error. To solve the problem, a signal-reconstruction-based phase gradient autofocus (SR-PGA) and a subimage resampling (SIR) methods are proposed. They are developed on the hyperbolic model. First, a subaperture division strategy divides the full-aperture high-order error into multiple low-order subaperture errors (SPEs). Then, the SR-PGA is developed to estimate the SPE, in which the precise deramping is reconstructed to eliminate the residual signal phase in the SPE. Third, the SIR is proposed to eliminate residual Doppler-variant shift of the adjacent subimages, improving the accuracy of the SPE combination. Finally, simulation and actual data processing verify the effectiveness and validity of the algorithm. |
| first_indexed | 2024-04-10T06:07:21Z |
| format | Article |
| id | doaj.art-8425e70985974a36b3f427074ec2a894 |
| institution | Directory Open Access Journal |
| issn | 2151-1535 |
| language | English |
| last_indexed | 2024-04-10T06:07:21Z |
| publishDate | 2023-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
| spelling | doaj.art-8425e70985974a36b3f427074ec2a8942023-03-03T00:00:06ZengIEEEIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing2151-15352023-01-01162327233810.1109/JSTARS.2023.324116910032728A High-Resolution Airborne SAR Autofocusing Approach Based on SR-PGA and Subimage Resampling With Precise Hyperbolic ModelYuhui Deng0https://orcid.org/0000-0001-5927-9905Hui Wang1https://orcid.org/0000-0002-9567-6227Guang-Cai Sun2https://orcid.org/0000-0002-6482-0863Yong Wang3https://orcid.org/0000-0003-3366-3137Wenkang Liu4https://orcid.org/0000-0002-4880-0897Jun Yang5Mengdao Xing6https://orcid.org/0000-0002-4084-0915National Laboratory of Radar Signal Processing, Xidian University, Xi'an, ChinaKey Laboratory of Millimeter Wave Imaging Technology, Shanghai Institute of Satellites Engineering, Shanghai, ChinaNational Laboratory of Radar Signal Processing, Xidian University, Xi'an, ChinaSchool of Resources and Environment, University of Electronic Science and Technology of China, Chengdu, ChinaAcademy of Advanced Interdisciplinary Research, Xidian University, Xi'an, ChinaCollege of Geomatics, Xi'an University of Science and Technology, Xi'an, ChinaNational Laboratory of Radar Signal Processing and the Academy of Advanced Interdisciplinary Research, Xidian University, Xi'an, ChinaHigh-resolution airborne synthetic aperture radar imaging requires long synthetic aperture time (LSAT). However, the LSAT invalidates the Fresnel approximation in the traditional autofocusing method, leaving a residual signal phase in the motion error. To solve the problem, a signal-reconstruction-based phase gradient autofocus (SR-PGA) and a subimage resampling (SIR) methods are proposed. They are developed on the hyperbolic model. First, a subaperture division strategy divides the full-aperture high-order error into multiple low-order subaperture errors (SPEs). Then, the SR-PGA is developed to estimate the SPE, in which the precise deramping is reconstructed to eliminate the residual signal phase in the SPE. Third, the SIR is proposed to eliminate residual Doppler-variant shift of the adjacent subimages, improving the accuracy of the SPE combination. Finally, simulation and actual data processing verify the effectiveness and validity of the algorithm.https://ieeexplore.ieee.org/document/10032728/Doppler subimage resamplinghyperbolic modellong synthetic apertureSAR autofocusingsignal-reconstruction-based phase gradient autofocus (SR-PGA)synthetic aperture radar (SAR) |
| spellingShingle | Yuhui Deng Hui Wang Guang-Cai Sun Yong Wang Wenkang Liu Jun Yang Mengdao Xing A High-Resolution Airborne SAR Autofocusing Approach Based on SR-PGA and Subimage Resampling With Precise Hyperbolic Model IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing Doppler subimage resampling hyperbolic model long synthetic aperture SAR autofocusing signal-reconstruction-based phase gradient autofocus (SR-PGA) synthetic aperture radar (SAR) |
| title | A High-Resolution Airborne SAR Autofocusing Approach Based on SR-PGA and Subimage Resampling With Precise Hyperbolic Model |
| title_full | A High-Resolution Airborne SAR Autofocusing Approach Based on SR-PGA and Subimage Resampling With Precise Hyperbolic Model |
| title_fullStr | A High-Resolution Airborne SAR Autofocusing Approach Based on SR-PGA and Subimage Resampling With Precise Hyperbolic Model |
| title_full_unstemmed | A High-Resolution Airborne SAR Autofocusing Approach Based on SR-PGA and Subimage Resampling With Precise Hyperbolic Model |
| title_short | A High-Resolution Airborne SAR Autofocusing Approach Based on SR-PGA and Subimage Resampling With Precise Hyperbolic Model |
| title_sort | high resolution airborne sar autofocusing approach based on sr pga and subimage resampling with precise hyperbolic model |
| topic | Doppler subimage resampling hyperbolic model long synthetic aperture SAR autofocusing signal-reconstruction-based phase gradient autofocus (SR-PGA) synthetic aperture radar (SAR) |
| url | https://ieeexplore.ieee.org/document/10032728/ |
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