Enhanced Target Localization based on Double RIS

Reconfigurable Intelligent Surface (RIS) has become an enabling technology for economically and efficiently realizing intelligent and reconfigurable wireless communication environments. Previous positioning research based on RIS has mainly focused on single RIS without considering the improvement in positioning accuracy brought by double RIS, thus failing to reveal the full potential of a double RIS-assisted wireless communication system. This paper investigates a target positioning system assisted by double RIS, where double RIS is used to enhance communication between users and the receiver. Firstly, the reception signal model based on the collaborative effect of double RIS is constructed, and then we formulate the target positioning problem based on this model, aiming to obtain the optimal target signal while minimizing system noise. Moreover, to verify the effectiveness of the localization system with double RIS assistance, we also configured a scenario of a single RIS localization system for comparative analysis. Simulation results indicate that the proposed target positioning method based on double RIS exhibits certain superiority in improving system positioning performance compared to single RIS.