RIS-AIDED MONOSTATIC MIMO RADAR WITH CO-LOCATED ANTENNAS

This paper considers the target detection problem in a monostatic multiple-input multiple-output (MIMO) radar aided by a reconfigurable intelligent surface (RIS). After modeling the received target signal as the superposition of four echoes, which may involve up to two bounces off the RIS, the phases of the reflecting elements and the radar receive filter are chosen to maximize the signal-to-noise ratio (SNR). Finally, we assess the performance of this architecture and study the interplay among the radar-RIS distance and the target location.