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Polarimetric SAR Calibration and Residual Error Estimation When Corner Reflectors Are Unavailable | IEEE Journals & Magazine | IEEE Xplore

Polarimetric SAR Calibration and Residual Error Estimation When Corner Reflectors Are Unavailable


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) chann...Show More

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.
Published in: IEEE Transactions on Geoscience and Remote Sensing ( Volume: 58, Issue: 6, June 2020)
Page(s): 4454 - 4471
Date of Publication: 20 January 2020

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