Calibration of Stokes and scattering matrix format polarimetric SAR data

It is shown that the assumptions about the backscatter and the polarimetric radar system for the two approaches described in J.D. Klein´s (1992) and J.J. van Zyl´s (1990) papers are equivalent. It is demonstrated that, to first order in the radar system crosstalk (i.e. neglecting terms of second order and above), an exact solution to the Stokes matrix format data calibration problem exists. It is shown that van Zyl´s approach can give this first-order solution for appropriately symmetrized polarimetric radar data. Then it is shown how, if the data are properly symmetrized, van Zyl´s approach can be used to calibrate both scattering matrix and Stokes matrix format data. These conclusions should be generally applicable to polarimetric imaging radar system data