UAV-to-GEO-Satellite Covert Communication With Multiple Cooperative Wardens

With high flexibility, UAVs have been widely used to assist geostationary earth orbit (GEO) satellite covert communication in operating urgent tasks. However, the detection scenarios of the existing UAV-assisted covert communication optimizations oversimplify the detection process, causing a mismatch with detection in practical scenarios and remaining security risks. Therefore, we first propose a two-stage hybrid air-ground cooperative detection scheme (TSH-AGC-DS), under which we jointly optimize the UAV’s position and beamforming pattern to enhance the GEO satellite’s communication quality. Finally, numerical results show that, compared to traditional detection schemes, our scheme can restrict the UAV’s position and suppress the received SNR.