Radar SINR Enhancement in Active RIS-Assisted ISAC Systems via Movable Antenna Optimization

This paper investigates an active reconfigurable intelligent surface (RIS) and movable antenna (MA)-aided integrated sensing and communication (ISAC) system for non-terrestrial networks. To enhance radar sensing performance, an SCA-based optimization framework is developed to adapt MA positions under communication quality-of-service constraints. Simulation results demonstrate that the proposed MA-enabled scheme significantly improves radar SINR compared with fixed antenna arrays, achieving comparable performance with fewer antenna elements.