A Range-Doppler Processing Based Calibration Method for Short-Range Millimeterwave FMCW Radar Imaging

This contribution presents a novel calibration method for ultra-wideband radar sensors. Calibrated radar measurements can be used to obtain quantitave correct reflection factor measurements in both, magnitude and phase, or to compensate for non-constant envelopes of the transmit signal that may degrade the pulse shape and therefore reduce resolution. The method is especially suited for short range imaging applications when the sample under test is in close proximity to the radiating aperture and is applicable to both, quasi-optical (QO) setups as well as synthetic aperture radar (SAR) imaging configurations. The proposed method utilizes a range-doppler measurement on a reference target to remove disturbing contributions by multiple reflections that are otherwise hardly separable from the target reflection.