Method for performing imaging polarimetry, transponder, and system for performing imaging polarimetry

A system, comprising:

• at least one passive, chipless transponder having at least two surface regions each configured to generate differentiated polarimetric backscatter in response to polarimetric illumination, wherein at least one of said at least two surface regions having a three-dimensional surface form with a plurality of parallel side walls each having an angle of inclination and said three-dimensional surface form defining a roof mirror;
• and
• at least one reader for radar-based reading of said at least one passive, chipless transponder, said at least one reader programmed to:
• irradiate said chipless, passive transponder by means of radar radiation with at least two differently polarized waves including a first polarized wave and a second polarized wave;
• generate a first polarization-encoded image of said chipless, passive transponder on a basis of the radar radiation reflected from said chipless, passive transponder based on the first polarized wave, the radar radiation being reflected without an energizing current operating an integrated circuit on said transponder nor by use of an antenna on said transponder;
• and
• generate a second polarization-encoded image of said chipless, passive transponder on a basis of the radar radiation reflected from said chipless, passive transponder based on the second polarized wave, the radar radiation being reflected without an energizing current operating an integrated circuit on said transponder nor by use of an antenna on said transponder;
• decode an identifier of said passive, chipless transponder using the first and second polarization encoded images.