For tracking multiple moving targets, a multiradar system employing ultra-wideband millimeter-wave array antennas is introduced. To separate the multiple echoes and the different Doppler velocities of the targets, the frequencydomain interferometric technique is used and is followed by an interferometric imaging process. The system consists of multiple radar modules that are well-separated, allowing measurements of the Doppler velocities from different lines of sight. Thus, in addition to constructing high-resolution images, the multi-radar system is able to estimate the velocity vector of each target, which has been demonstrated in practice through measurements.