  The Dual-Frequency synthetic aperture radar (DFSAR) system manifested on the
Chandrayaan-2 spacecraft represents a significant step forward in radar
exploration of solid solar system objects. It combines SAR at two wavelengths
(L- and S-bands) and multiple resolutions with several polarimetric modes in
one lightweight ($\sim$ 20 kg) package. The resulting data from DFSAR support
calculation of the 2$\times$2 complex scattering matrix for each resolution
cell, which enables lunar near surface characterization in terms of radar
polarization properties at different wavelengths and incidence angles. In this
paper, we report on the calibration and preliminary performance
characterization of DFSAR data based on the analysis of a sample set of crater
regions on the Moon. Our calibration analysis provided a means to compare
on-orbit performance with pre-launch measurements and the results matched with
the pre-launch expected values. Our initial results show that craters in both
permanently shadowed regions (PSRs) and non-PSRs that are classified as
Circular Polarization Ratio (CPR)-anomalous in previous S-band radar analyses
appear anomalous at L-band also. We also observe that material evolution and
physical properties at their interior and proximal ejecta are decoupled. For
Byrgius C crater region, we compare our analysis of dual-frequency radar data
with the predicted behaviours of theoretical scattering models. If crater age
estimates are available, comparison of their radar polarization properties at
multiple wavelengths similar to that of the three unnamed south polar crater
regions shown in this study may provide new insights into how the rockiness of
craters evolves with time.
