Title :
Invariant Contrast Parameters of PolInSAR Homogenous RVoG Model
Author :
Refregier, Philippe ; Roueff, Antoine ; Arnaubec, Aurelien ; Dubois-Fernandez, Pascale C.
Author_Institution :
Inst. Fresnel, Aix Marseille Univ., Marseille, France
Abstract :
It has been shown that the Cramer-Rao bound (CRB) can be helpful to characterize vegetation and ground height estimations based on the homogenous random volume over ground (RVoG) model and polarimetric interferometric SAR techniques. However, this model is a function of 20 unknown parameters, which makes the performance analysis a tedious task. We show that the group invariance property of the RVoG model can greatly reduce the complexity of the analysis since the CRB of the vegetation and ground heights only depends on four unknown parameters instead of 20. Furthermore, for the considered situations analyzed in this letter, only three of these four parameters have a nonnegligible influence and can be interpreted as contrast parameters.
Keywords :
radar interferometry; radar polarimetry; random processes; synthetic aperture radar; CRB; Cramer-Rao bound; PolInSAR homogenous RVoG model; ground height estimation; group invariance property; homogenous random volume over ground model; invariant contrast parameter; polarimetric interferometric SAR technique; vegetation; Analytical models; Estimation; Remote sensing; Solid modeling; Synthetic aperture radar; Vectors; Vegetation mapping; Cramer–Rao bound (CRB); Cramer??Rao bound (CRB); polarimetric interferometric SAR (PolInSAR); random volume over ground (RVoG) model;
Journal_Title :
Geoscience and Remote Sensing Letters, IEEE
DOI :
10.1109/LGRS.2013.2294343