A Novel Strategy of Ambiguity Correction for the Improved Faraday Rotation Estimator in Linearly Full-Polarimetric SAR Data
Spaceborne synthetic aperture radar (SAR) missions operating at low frequencies, such as L-band or P-band, are significantly influenced by the ionosphere. As one of the serious ionosphere effects, Faraday rotation (FR) is a remarkable distortion source for the polarimetric SAR (PolSAR) application....
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-04-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/18/4/1158 |
| _version_ | 1798041774145404928 |
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| author | Jinhui Li Yifei Ji Yongsheng Zhang Qilei Zhang Haifeng Huang Zhen Dong |
| author_facet | Jinhui Li Yifei Ji Yongsheng Zhang Qilei Zhang Haifeng Huang Zhen Dong |
| author_sort | Jinhui Li |
| collection | DOAJ |
| description | Spaceborne synthetic aperture radar (SAR) missions operating at low frequencies, such as L-band or P-band, are significantly influenced by the ionosphere. As one of the serious ionosphere effects, Faraday rotation (FR) is a remarkable distortion source for the polarimetric SAR (PolSAR) application. Various published FR estimators along with an improved one have been introduced to solve this issue, all of which are implemented by processing a set of PolSAR real data. The improved estimator exhibits optimal robustness based on performance analysis, especially in term of the system noise. However, all published estimators, including the improved estimator, suffer from a potential FR angle (FRA) ambiguity. A novel strategy of the ambiguity correction for those FR estimators is proposed and shown as a flow process, which is divided into pixel-level and image-level correction. The former is not yet recognized and thus is considered in particular. Finally, the validation experiments show a prominent performance of the proposed strategy. |
| first_indexed | 2024-04-11T22:26:18Z |
| format | Article |
| id | doaj.art-229bac9353584249af72c30c84a9df0a |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T22:26:18Z |
| publishDate | 2018-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-229bac9353584249af72c30c84a9df0a2022-12-22T03:59:38ZengMDPI AGSensors1424-82202018-04-01184115810.3390/s18041158s18041158A Novel Strategy of Ambiguity Correction for the Improved Faraday Rotation Estimator in Linearly Full-Polarimetric SAR DataJinhui Li0Yifei Ji1Yongsheng Zhang2Qilei Zhang3Haifeng Huang4Zhen Dong5College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaCollege of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaCollege of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaCollege of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaCollege of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaCollege of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaSpaceborne synthetic aperture radar (SAR) missions operating at low frequencies, such as L-band or P-band, are significantly influenced by the ionosphere. As one of the serious ionosphere effects, Faraday rotation (FR) is a remarkable distortion source for the polarimetric SAR (PolSAR) application. Various published FR estimators along with an improved one have been introduced to solve this issue, all of which are implemented by processing a set of PolSAR real data. The improved estimator exhibits optimal robustness based on performance analysis, especially in term of the system noise. However, all published estimators, including the improved estimator, suffer from a potential FR angle (FRA) ambiguity. A novel strategy of the ambiguity correction for those FR estimators is proposed and shown as a flow process, which is divided into pixel-level and image-level correction. The former is not yet recognized and thus is considered in particular. Finally, the validation experiments show a prominent performance of the proposed strategy.http://www.mdpi.com/1424-8220/18/4/1158synthetic aperture radar (SAR)Faraday rotation (FR)polarimetric SAR (PolSAR)FR angle (FRA) ambiguityambiguity correction |
| spellingShingle | Jinhui Li Yifei Ji Yongsheng Zhang Qilei Zhang Haifeng Huang Zhen Dong A Novel Strategy of Ambiguity Correction for the Improved Faraday Rotation Estimator in Linearly Full-Polarimetric SAR Data Sensors synthetic aperture radar (SAR) Faraday rotation (FR) polarimetric SAR (PolSAR) FR angle (FRA) ambiguity ambiguity correction |
| title | A Novel Strategy of Ambiguity Correction for the Improved Faraday Rotation Estimator in Linearly Full-Polarimetric SAR Data |
| title_full | A Novel Strategy of Ambiguity Correction for the Improved Faraday Rotation Estimator in Linearly Full-Polarimetric SAR Data |
| title_fullStr | A Novel Strategy of Ambiguity Correction for the Improved Faraday Rotation Estimator in Linearly Full-Polarimetric SAR Data |
| title_full_unstemmed | A Novel Strategy of Ambiguity Correction for the Improved Faraday Rotation Estimator in Linearly Full-Polarimetric SAR Data |
| title_short | A Novel Strategy of Ambiguity Correction for the Improved Faraday Rotation Estimator in Linearly Full-Polarimetric SAR Data |
| title_sort | novel strategy of ambiguity correction for the improved faraday rotation estimator in linearly full polarimetric sar data |
| topic | synthetic aperture radar (SAR) Faraday rotation (FR) polarimetric SAR (PolSAR) FR angle (FRA) ambiguity ambiguity correction |
| url | http://www.mdpi.com/1424-8220/18/4/1158 |
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