Mutual Coupling and Channel Imbalance Calibration of Colocated MIMO Radars

The Multiple-Input Multiple-Output (MIMO) radar combines the signals from multiple transmit and receive elements separately to form a virtual array. Consequently, system imperfections in MIMO caused by channel imbalance mutual coupling are repeatedly present array, affecting beamforming performance. In this paper, beam pattern deviations these described mathematically relation single point target. Furthermore, nonparametric calibration technique estimate compensate for effects at different angles is presented exploiting that same times proposed method applied measurements with an 8 $\times $ colocated X-band radar, peak sidelobe level (PSL) integrated (ISL) used as performance parameters. found improve both PSL ISL approximately 15 dB within whole field-of-view (FOV) antennas not minimum scatterers. For above ±30° antenna boresight, of surpass other methods. This advantageous radars they typically cover wide FOV.