  We investigate the problem of reconfigurable intelligent surface (RIS)-aided
monostatic sensing of a mobile target under line-of-sight (LoS) blockage
considering a single antenna, full-duplex, and dual-functional
radar-communications base station (BS). For the purpose of target detection and
delay/Doppler/angle estimation, we derive a detector based on the generalized
likelihood ratio test (GLRT), which entails a high-dimensional parameter search
and leads to angle-Doppler coupling. To tackle these challenges, we propose a
two-step algorithm for solving the GLRT detector/estimator in a low-complexity
manner, accompanied by a RIS phase profile design tailored to circumvent the
angle-Doppler coupling effect. Simulation results verify the effectiveness of
the proposed algorithm, demonstrating its convergence to theoretical bounds and
its superiority over state-of-the-art mobility-agnostic benchmarks.
