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The alluring polarimetric characteristics of a dihedral corner reflector make it specially useful as a polarimetric calibration reference. However, for a radar cross section (RCS) range with quasi-monostatic geometry where there exists a small bistatic angle, the polarimetric calibration error rapidly increases as the bistatic angle increases when a dihedral is used as the polarimetric calibration reference. In this work, an improved calibration technique for quasi-monostatic polarimetric measurement system is proposed. The scattering mechanism of a rectangular dihedral corner reflector in a quasi-monostatic radar system is analyzed, where the bistatic angle constrains to be within a few degrees. The polarimetric characteristic of the dihedral is evaluated by means of physical optics (POs) approximation. Combining the evaluation formulation with a nonlinear calibration technique, the polarimetric measurement error model can be adapted for the quasi-monostatic geometry so that accurate polarimetric calibration may be accomplished. The experimental results are presented to validate the proposed technique with essential improvement in the calibrated cross polarimetric measurements.

Improved Calibration Technique for Quasi-Monostatic Polarimetric Measurement System Using a Dihedral as the Calibration Reference