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Polarimetric SAR Calibration and Residual Error Estimation When Corner Reflectors Are Unavailable.
- Source :
-
IEEE Transactions on Geoscience & Remote Sensing . Jun2020, Vol. 58 Issue 6, p4454-4471. 18p. - Publication Year :
- 2020
-
Abstract
- In this article, we propose a polarimetric calibration (PolCal) algorithm to estimate the system crosstalk, cross-polarization (x-pol), and co-polarization (co-pol) channel imbalance (CI) when ground corner reflectors (CRs) are unavailable. The current PolCal process requires at least one trihedral CR to determine the co-pol CI. However, the deployment of ground CRs is costly and may even be impossible in some areas. To calibrate a polarimetric image without CRs, our proposed method automatically extracts the volume-dominated and Bragg-like pixels as a reference to estimate the crosstalk, x-pol, and co-pol CI values. Then, a first-order polynomial model is exploited to fit the co-pol CI to further improve calibration accuracy. In the experimental section, we demonstrate the effectiveness of our proposed method with data from two of China’s newly developed very high-resolution systems. The experiments confirmed that the proposed workflow can be considered as a feasible calibration scheme when the ground deployment of CRs is impossible, and it is also an effective analysis tool for the assessment of calibrated products. [ABSTRACT FROM AUTHOR]
- Subjects :
- *QUALITY function deployment
*CALIBRATION
*ALGORITHMS
*SYNTHETIC aperture radar
Subjects
Details
- Language :
- English
- ISSN :
- 01962892
- Volume :
- 58
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Geoscience & Remote Sensing
- Publication Type :
- Academic Journal
- Accession number :
- 144948189
- Full Text :
- https://doi.org/10.1109/TGRS.2020.2964732