Analysis and Compensation for Systematical Errors in Airborne Microwave Photonic SAR Imaging by 2-D Autofocus
In the area of synthetic aperture radar (SAR), the ultrahigh resolution is always a continuous pursuit for researchers. To realize ultrahigh resolution, microwave photonics technology is an excellent solution since it has advantages of low transmission loss, ultrawide bandwidth (UWB), etc. However,...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IEEE
2023-01-01
|
| Series: | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/10045770/ |
| _version_ | 1827999930909720576 |
|---|---|
| author | Min Chen Xiaolan Qiu Ruoming Li Wangzhe Li Kun Fu |
| author_facet | Min Chen Xiaolan Qiu Ruoming Li Wangzhe Li Kun Fu |
| author_sort | Min Chen |
| collection | DOAJ |
| description | In the area of synthetic aperture radar (SAR), the ultrahigh resolution is always a continuous pursuit for researchers. To realize ultrahigh resolution, microwave photonics technology is an excellent solution since it has advantages of low transmission loss, ultrawide bandwidth (UWB), etc. However, with the improvement of resolution, new problems arise as the impact of more systematical errors becomes non-negligible, for example, the synchronization error between the transmit channel and the mixing channel, unknown system delay during signal reception, and the fluctuation of frequency for UWB signals. These factors will bring the degradation of the focusing quality of SAR images together with the motion errors and the trajectory measurement errors, causing not only residual range cell migration and azimuth phase error, but also higher order phase error along the range frequency dimension. In this article, we discuss the adverse influence of the above factors and give a detailed analysis of the 2-D phase error of the coarse focused image processed by range migration algorithm. Then, to compensate for the above unknown systematical errors, a 2-D autofocus method is proposed, and the effectiveness is validated by experiments on both simulated and real data. |
| first_indexed | 2024-04-10T06:07:16Z |
| format | Article |
| id | doaj.art-74f998d7908b4b0c914152818b4b79a0 |
| institution | Directory Open Access Journal |
| issn | 2151-1535 |
| language | English |
| last_indexed | 2024-04-10T06:07:16Z |
| 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-74f998d7908b4b0c914152818b4b79a02023-03-03T00:00:05ZengIEEEIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing2151-15352023-01-01162221223610.1109/JSTARS.2023.324582710045770Analysis and Compensation for Systematical Errors in Airborne Microwave Photonic SAR Imaging by 2-D AutofocusMin Chen0https://orcid.org/0000-0003-4473-0390Xiaolan Qiu1https://orcid.org/0000-0002-8517-3415Ruoming Li2https://orcid.org/0000-0003-1783-6798Wangzhe Li3https://orcid.org/0000-0001-5074-4620Kun Fu4https://orcid.org/0000-0002-0450-6469Key Laboratory of Technology in Geo-Spatial Information Processing and Application Systems, Chinese Academy of Sciences, Beijing, ChinaSuzhou Aerospace Information Research Institute, Suzhou, ChinaNational Key Laboratory of Microwave Imaging Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, ChinaNational Key Laboratory of Microwave Imaging Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, ChinaSuzhou Aerospace Information Research Institute, Suzhou, ChinaIn the area of synthetic aperture radar (SAR), the ultrahigh resolution is always a continuous pursuit for researchers. To realize ultrahigh resolution, microwave photonics technology is an excellent solution since it has advantages of low transmission loss, ultrawide bandwidth (UWB), etc. However, with the improvement of resolution, new problems arise as the impact of more systematical errors becomes non-negligible, for example, the synchronization error between the transmit channel and the mixing channel, unknown system delay during signal reception, and the fluctuation of frequency for UWB signals. These factors will bring the degradation of the focusing quality of SAR images together with the motion errors and the trajectory measurement errors, causing not only residual range cell migration and azimuth phase error, but also higher order phase error along the range frequency dimension. In this article, we discuss the adverse influence of the above factors and give a detailed analysis of the 2-D phase error of the coarse focused image processed by range migration algorithm. Then, to compensate for the above unknown systematical errors, a 2-D autofocus method is proposed, and the effectiveness is validated by experiments on both simulated and real data.https://ieeexplore.ieee.org/document/10045770/2-D autofocusmicrowave photonic (MWP) synthetic aperture radar (SAR)range migration algorithm (RMA)systematical errorsultrawide bandwidth (UWB) |
| spellingShingle | Min Chen Xiaolan Qiu Ruoming Li Wangzhe Li Kun Fu Analysis and Compensation for Systematical Errors in Airborne Microwave Photonic SAR Imaging by 2-D Autofocus IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 2-D autofocus microwave photonic (MWP) synthetic aperture radar (SAR) range migration algorithm (RMA) systematical errors ultrawide bandwidth (UWB) |
| title | Analysis and Compensation for Systematical Errors in Airborne Microwave Photonic SAR Imaging by 2-D Autofocus |
| title_full | Analysis and Compensation for Systematical Errors in Airborne Microwave Photonic SAR Imaging by 2-D Autofocus |
| title_fullStr | Analysis and Compensation for Systematical Errors in Airborne Microwave Photonic SAR Imaging by 2-D Autofocus |
| title_full_unstemmed | Analysis and Compensation for Systematical Errors in Airborne Microwave Photonic SAR Imaging by 2-D Autofocus |
| title_short | Analysis and Compensation for Systematical Errors in Airborne Microwave Photonic SAR Imaging by 2-D Autofocus |
| title_sort | analysis and compensation for systematical errors in airborne microwave photonic sar imaging by 2 d autofocus |
| topic | 2-D autofocus microwave photonic (MWP) synthetic aperture radar (SAR) range migration algorithm (RMA) systematical errors ultrawide bandwidth (UWB) |
| url | https://ieeexplore.ieee.org/document/10045770/ |
| work_keys_str_mv | AT minchen analysisandcompensationforsystematicalerrorsinairbornemicrowavephotonicsarimagingby2dautofocus AT xiaolanqiu analysisandcompensationforsystematicalerrorsinairbornemicrowavephotonicsarimagingby2dautofocus AT ruomingli analysisandcompensationforsystematicalerrorsinairbornemicrowavephotonicsarimagingby2dautofocus AT wangzheli analysisandcompensationforsystematicalerrorsinairbornemicrowavephotonicsarimagingby2dautofocus AT kunfu analysisandcompensationforsystematicalerrorsinairbornemicrowavephotonicsarimagingby2dautofocus |