High Angular Resolution Digital Beamforming Method for Coherent FMCW MIMO Radar Networks

In this work, we investigate the feasibility of a high angular resolution digital beamforming method for coherent frequency-modulated continuous-wave (FMCW) multiple-input multiple-output (MIMO) radar networks. The proposed coherent radar network system consists of two separate FMCW radars, where each radar unit comprises
$N$
TX
transmit and
$N$
RX
receive antennas. The proposed method will combine two separate FMCW radars to an FMCW radar network with
$2 N$
TX
×
$2 N$
RX
virtual antennas for MIMO applications. Compared to existing work, the proposed method does not depend on the distance between two separate radars. The distance is arbitrary and this will enable us to increase the number of radars in coherent FMCW MIMO radar networks in the future.