A Review of Polarization Orientation Estimation from Polarimetric SAR Data

In this paper, we review estimation algorithms and applications of polarization orientation angle induced by terrain slopes. We develop a unified analysis of estimation algorithms based on the circular polarization covariance matrix. The concept of reflection symmetry is used to explain the soundness of the circular polarization method, and to show problems associated with other algorithms. The effect of radar frequency, scattering media, and polarimetric calibration will also be discussed. SIR-C, and JPL AIRSAR L-band and P-band polarimetric SAR images are used for demonstration.