Polarimetric calibration of SAR images using reflection symmetric targets with low helix scattering
Polarimetric synthetic aperture radar is an important technology for Earth observation. Generally, polarimetric calibration (PolCAL) should be performed before any quantitative applications. The reflection symmetric targets can relieve the dependence of PolCAL on calibrators. In this work, we use a...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-12-01
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| Series: | International Journal of Applied Earth Observations and Geoinformation |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S030324342100266X |
| _version_ | 1828337906164432896 |
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| author | Yonglei Chang Lingli Zhao Lei Shi Yunju Nie Zhenyang Hui Qiulin Xiong Pingxiang Li |
| author_facet | Yonglei Chang Lingli Zhao Lei Shi Yunju Nie Zhenyang Hui Qiulin Xiong Pingxiang Li |
| author_sort | Yonglei Chang |
| collection | DOAJ |
| description | Polarimetric synthetic aperture radar is an important technology for Earth observation. Generally, polarimetric calibration (PolCAL) should be performed before any quantitative applications. The reflection symmetric targets can relieve the dependence of PolCAL on calibrators. In this work, we use a helix-ratio feature to extract these targets. Through analysis, we find that the helix-ratio feature has a high tolerance to polarimetric distortions and is suitable for extracting samples in un-calibrated images for PolCAL. An adaptive segmentation algorithm is also developed to extract reflection symmetric targets automatically. Experiments with C- and X-band airborne images show that the extraction of reflection symmetric targets can improve the calibration accuracy of crosstalk. In addition, the proposed method can maintain the polarimetric signature of the targets in the calibration and can improve calibration performance when compared with other reflection symmetric target extraction methods. |
| first_indexed | 2024-04-13T22:21:12Z |
| format | Article |
| id | doaj.art-79d804413a944d7592bff076dd41113c |
| institution | Directory Open Access Journal |
| issn | 1569-8432 |
| language | English |
| last_indexed | 2024-04-13T22:21:12Z |
| publishDate | 2021-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Applied Earth Observations and Geoinformation |
| spelling | doaj.art-79d804413a944d7592bff076dd41113c2022-12-22T02:27:14ZengElsevierInternational Journal of Applied Earth Observations and Geoinformation1569-84322021-12-01104102559Polarimetric calibration of SAR images using reflection symmetric targets with low helix scatteringYonglei Chang0Lingli Zhao1Lei Shi2Yunju Nie3Zhenyang Hui4Qiulin Xiong5Pingxiang Li6Faculty of Geomatics, East China University of Technology, Nanchang, ChinaSchool of Remote Sensing and Information Engineering, Wuhan University, Wuhan, China; Corresponding author at: School of Remote Sensing and Information Engineering, Wuhan University, 129 Luoyu Road, Wuhan, China.State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, ChinaFaculty of Geomatics, East China University of Technology, Nanchang, ChinaFaculty of Geomatics, East China University of Technology, Nanchang, ChinaFaculty of Geomatics, East China University of Technology, Nanchang, ChinaState Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, ChinaPolarimetric synthetic aperture radar is an important technology for Earth observation. Generally, polarimetric calibration (PolCAL) should be performed before any quantitative applications. The reflection symmetric targets can relieve the dependence of PolCAL on calibrators. In this work, we use a helix-ratio feature to extract these targets. Through analysis, we find that the helix-ratio feature has a high tolerance to polarimetric distortions and is suitable for extracting samples in un-calibrated images for PolCAL. An adaptive segmentation algorithm is also developed to extract reflection symmetric targets automatically. Experiments with C- and X-band airborne images show that the extraction of reflection symmetric targets can improve the calibration accuracy of crosstalk. In addition, the proposed method can maintain the polarimetric signature of the targets in the calibration and can improve calibration performance when compared with other reflection symmetric target extraction methods.http://www.sciencedirect.com/science/article/pii/S030324342100266XSARPolarimetric calibrationReflection symmetryHelix scattering |
| spellingShingle | Yonglei Chang Lingli Zhao Lei Shi Yunju Nie Zhenyang Hui Qiulin Xiong Pingxiang Li Polarimetric calibration of SAR images using reflection symmetric targets with low helix scattering International Journal of Applied Earth Observations and Geoinformation SAR Polarimetric calibration Reflection symmetry Helix scattering |
| title | Polarimetric calibration of SAR images using reflection symmetric targets with low helix scattering |
| title_full | Polarimetric calibration of SAR images using reflection symmetric targets with low helix scattering |
| title_fullStr | Polarimetric calibration of SAR images using reflection symmetric targets with low helix scattering |
| title_full_unstemmed | Polarimetric calibration of SAR images using reflection symmetric targets with low helix scattering |
| title_short | Polarimetric calibration of SAR images using reflection symmetric targets with low helix scattering |
| title_sort | polarimetric calibration of sar images using reflection symmetric targets with low helix scattering |
| topic | SAR Polarimetric calibration Reflection symmetry Helix scattering |
| url | http://www.sciencedirect.com/science/article/pii/S030324342100266X |
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