  An innovative 3-D radar imaging technique is developed for fast and efficient
identification and characterization of radar backscattering components of
complex objects, when the collected scattered field is made of
polarization-diverse measurements. In this context, all the polarimetric
information seems irretrievably mixed. A direct model, derived from a simple
but original extension of the widespread "multiple scattering model" leads to a
high dimensional linear inverse problem. It is solved by a fast dedicated
imaging algorithm that performs to determine at a time three huge 3-D scatterer
maps which correspond to HH, VV and HV polarizations at emission and reception.
It is applied successfully to various mock-ups and data sets collected from an
accurate and dedicated 3D spherical experimental layout that provides
concentric polarization-diverse RCS measurements.
