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Present fully polarimetric synthetic aperture radar (SAR) systems often update calibration techniques to further enhance the accuracyto the polarimetric data. In this paper, we propose a modified method to estimate the value of crosstalk based on the correctedobserved value. Since Ainsworth calibration algorithm firstly set the value of k to be one. And the value of k relates to the copolarizationchannel imbalance .We consider the effects of value of k and analyze it. Through comparison to crosstalk resultsbetween the stimulated parameters and the estimated parameters, we assume high co-polarization channel imbalance will beobviously to affect crosstalk results. Then, used covariance observation value of the initial value of k rewrites the model to solverelated parameters. And crosstalk parameter is calculated by the same iterative method. To verify the effect of the modifiedcalibration method, this letter compares the accuracy of the two methods using the simulated polarimetric SAR data and Chineseairborne X-band polarimetric SAR data. The results confirm that the modified method tends to get more accurate crosstalk results

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

A MODIFIED METHOD FOR POLARIMETRIC SAR CALIBRATION ALGORITHM