Application of Freeman-Durden Decomposition to Polarimetric SAR Interferometry

摘要

In this paper the formulation of the Freeman-Durden decomposition has been extended to PolInSAR data sets. The procedurernassumes that the interferometric cross-correlation for the linear basis can be decomposed into the three mechanismsrnconsidered by the Freeman-Durden approach (i.e. direct, double-bounce and volume scattering mechanisms) even thoughrnany other decomposition could be used. In this case the retrieved parameters are defined with magnitude and phase, andrnhence the power contribution is estimated jointly with the phase center of the scattering mechanism. Therefore, the retrievedrnmagnitudes are also associated with their corresponding interferometric phases which are related to the verticalrnlocations and, actually, the results must be analyzed in terms of the VV and HH interferometric cross-correlations. Indoorrnand airborne data have been used for testing the procedure. When compared with the original Freeman-Durden decompositionrnfor PolSAR data some new features have been identified in both datasets as a result of the incorporation of therninterferometric information.