I'm studying the PolSAR basics and came across the polarization signatures (co-pol and cross-pol). There is a case of a sphere or trihedral corner reflectors (odd-bounce) described for example here: http:/
I do not understand why the power of the co-polarized signature has maximum values for linear polarizations (ellipticity=0) since "The wave is backscattered with the same polarization, except for a change of sign of the ellipticity (or in the case of linear polarization, a change of the phase angle between Eh and Ev of 180o)". If I understand right one reflection of linearly polarized wave should cause a phase shift of 180 degrees between Eh and Ev, which results in ortogonal polarization (except the case of V and H polarizations).
What am I missing here?