Phase Self-Calibration for Millimeter Wave MIMO Imaging

A simple approach of phase self-calibration for millimeter wave imaging is proposed. By exploiting features of direct coupling between pairs of transmitting and receiving antennas, the channel group delay caused by the hardware can be calculated. Then the data after pulse compression is phase-shifted before imaging to remove the phase error. This phase calibration procedure requires no additional reference target. Experimental results verify the validity and effectiveness of the proposed self-calibration-approach, which can serve as a benchmark or basis for more sophisticated phase calibration approaches.