Polarimetric calibration of spaceborne and airborne multifrequency SAR data

This study focused on the evaluating the requirement of the Polarimetric calibration for the Quad-pol and Compact-pol datasets. By performing the polarimetric calibration procedures on the ISRO’s L&S Band Airborne SAR, UAVSAR L-band, ALOS-2 PALSAR-2, and RADARSAT-2 Quad-pol datasets, it was found that the channel imbalance and phase bias distortions were not high for all the datasets and the major cause for the polarimetric distortions was due to the crosstalk. Quegan, Improved Quegan, and Ainsworth methods for crosstalk calibration of quad-pol datasets were implemented in this study to assess the potential of each algorithm for the accurate estimation and minimization of the crosstalk. It was clearly understood that the Improved Quegan algorithm performs good results in a lower amount of residual crosstalk when there is very high crosstalk present in the datasets before polarimetric calibration.

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