SAR Radiometric Cross-Calibration Based on Multiple Pseudoinvariant Calibration Sites With Extensive Backscattering Coefficient Range
Synthetic aperture radar (SAR) radiometric cross-calibration achieves the calibration of uncalibrated satellites by employing calibrated satellites to illuminate the same ground targets. The stability of these ground targets is critical for effective cross-calibration. Such stable ground targets, na...
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| Format: | Article |
| Language: | English |
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IEEE
2025-01-01
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| Series: | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
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| Online Access: | https://ieeexplore.ieee.org/document/10820887/ |
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| _version_ | 1825207005924556800 |
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| author | Yongsheng Zhou Xiang Chen Qiang Yin Fei Ma Fan Zhang |
| author_facet | Yongsheng Zhou Xiang Chen Qiang Yin Fei Ma Fan Zhang |
| author_sort | Yongsheng Zhou |
| collection | DOAJ |
| description | Synthetic aperture radar (SAR) radiometric cross-calibration achieves the calibration of uncalibrated satellites by employing calibrated satellites to illuminate the same ground targets. The stability of these ground targets is critical for effective cross-calibration. Such stable ground targets, named pseudoinvariant calibration sites (PICSs), have been extensively researched for optical sensors, but there has been comparatively less focus on SAR sensors. Furthermore, studies that synthesize multiple targets for comprehensive dynamic range calibration remain relatively unexplored. This article proposes an optimized method for selecting PICS for SAR radiometric cross-calibration to address these issues. This method incorporates spatial variation coefficients, spatial autocorrelation indicators, and edge extraction techniques to identify homogeneous targets. In addition, the backscattering coefficient's time-series root mean square error (RMSE) is leveraged to identify stable targets. Using time-series data from Sentinel-1, the study identifies 57 stable homogeneous targets as PICS, exhibiting a wide intensity distribution and a time-series RMSE less than 0.5 dB. Based on these PICS, this article further develops a wide dynamic range cross-calibration method based on multiple PICS sites. It employs weighted least squares regression for the different data quality of each site. The cross-calibration experiments demonstrate an average improvement in the accuracy of 0.82 dB compared to the cross-calibration method utilizing a single PICS site. |
| format | Article |
| id | doaj-art-266a2366e4c04b168ffc7a437db17794 |
| institution | Kabale University |
| issn | 1939-1404 2151-1535 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
| spelling | doaj-art-266a2366e4c04b168ffc7a437db177942025-02-07T00:00:31ZengIEEEIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing1939-14042151-15352025-01-01184836484910.1109/JSTARS.2025.352546110820887SAR Radiometric Cross-Calibration Based on Multiple Pseudoinvariant Calibration Sites With Extensive Backscattering Coefficient RangeYongsheng Zhou0https://orcid.org/0000-0001-7261-7606Xiang Chen1Qiang Yin2https://orcid.org/0000-0002-8413-4756Fei Ma3https://orcid.org/0000-0003-4906-6142Fan Zhang4https://orcid.org/0000-0002-2058-2373College of Information Science and Technology, Beijing University of Chemical Technology, Beijing, ChinaCollege of Information Science and Technology, Beijing University of Chemical Technology, Beijing, ChinaCollege of Information Science and Technology, Beijing University of Chemical Technology, Beijing, ChinaCollege of Information Science and Technology, Beijing University of Chemical Technology, Beijing, ChinaCollege of Information Science and Technology, Beijing University of Chemical Technology, Beijing, ChinaSynthetic aperture radar (SAR) radiometric cross-calibration achieves the calibration of uncalibrated satellites by employing calibrated satellites to illuminate the same ground targets. The stability of these ground targets is critical for effective cross-calibration. Such stable ground targets, named pseudoinvariant calibration sites (PICSs), have been extensively researched for optical sensors, but there has been comparatively less focus on SAR sensors. Furthermore, studies that synthesize multiple targets for comprehensive dynamic range calibration remain relatively unexplored. This article proposes an optimized method for selecting PICS for SAR radiometric cross-calibration to address these issues. This method incorporates spatial variation coefficients, spatial autocorrelation indicators, and edge extraction techniques to identify homogeneous targets. In addition, the backscattering coefficient's time-series root mean square error (RMSE) is leveraged to identify stable targets. Using time-series data from Sentinel-1, the study identifies 57 stable homogeneous targets as PICS, exhibiting a wide intensity distribution and a time-series RMSE less than 0.5 dB. Based on these PICS, this article further develops a wide dynamic range cross-calibration method based on multiple PICS sites. It employs weighted least squares regression for the different data quality of each site. The cross-calibration experiments demonstrate an average improvement in the accuracy of 0.82 dB compared to the cross-calibration method utilizing a single PICS site.https://ieeexplore.ieee.org/document/10820887/Incidence angle correctionradiometric cross-calibrationsynthetic aperture radar (SAR)weighted least squares regression |
| spellingShingle | Yongsheng Zhou Xiang Chen Qiang Yin Fei Ma Fan Zhang SAR Radiometric Cross-Calibration Based on Multiple Pseudoinvariant Calibration Sites With Extensive Backscattering Coefficient Range IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing Incidence angle correction radiometric cross-calibration synthetic aperture radar (SAR) weighted least squares regression |
| title | SAR Radiometric Cross-Calibration Based on Multiple Pseudoinvariant Calibration Sites With Extensive Backscattering Coefficient Range |
| title_full | SAR Radiometric Cross-Calibration Based on Multiple Pseudoinvariant Calibration Sites With Extensive Backscattering Coefficient Range |
| title_fullStr | SAR Radiometric Cross-Calibration Based on Multiple Pseudoinvariant Calibration Sites With Extensive Backscattering Coefficient Range |
| title_full_unstemmed | SAR Radiometric Cross-Calibration Based on Multiple Pseudoinvariant Calibration Sites With Extensive Backscattering Coefficient Range |
| title_short | SAR Radiometric Cross-Calibration Based on Multiple Pseudoinvariant Calibration Sites With Extensive Backscattering Coefficient Range |
| title_sort | sar radiometric cross calibration based on multiple pseudoinvariant calibration sites with extensive backscattering coefficient range |
| topic | Incidence angle correction radiometric cross-calibration synthetic aperture radar (SAR) weighted least squares regression |
| url | https://ieeexplore.ieee.org/document/10820887/ |
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