Intelligent reflecting surface (IRS) is regarded as a promising technique to control wireless channels for improving the communication and/or sensing performance of wireless systems. In this paper, we propose a new target-mounted IRS approach for wireless sensing, where IRS is mounted on the outer/echo surface of a target for either enhancing the IRS/target reflected signal towards the legitimate radar station (LRS) to facilitate its detection of the target, or suppressing that towards the unauthorized radar station (URS) to prevent its detection of the target, by flexibly tuning the IRS reflection. To this end, we assume that sensors are installed along with the reflecting elements at IRS to detect the angles of arrival (AoA) of radar signals from the LRS/URS, based on which IRS reflection is designed to achieve signal enhancement/suppression in the angle of departure (AoD) towards the LRS/URS, respectively. Simulation results are presented to verify the performance of the proposed controllable wireless sensing approach with target-mounted IRS, as compared to various benchmark schemes.
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