A UAV Communication System with Anti-Interference and Covert Communication Capabilities Using Two Antennas

In drone warfare, enemy interception or jamming of signals directly leads to mission failure. To enhance the drone's resistance to interception and jamming, a communication system employing two transmitting and two receiving antennas has been developed. Within this system, the transmitting end's two antennas emit main channel signals at different phases and measure the phase difference at the receiving antenna, thereby establishing a covert channel for conveying dynamic spread spectrum codes. These codes are then used to spread the main channel signal in the subsequent frame, thereby strengthening the signal. Simulation and experimental results demonstrate that, compared to traditional transmission links, this approach reduces the probability of interception by three orders of magnitude with just an additional transmitting and receiving antenna pair; it achieves a gain of 10-30dB against linear frequency modulation noise. This design is intended for use in the combat communication systems of unmanned aerial vehicle fleets, enhancing interception and jamming resistance at a low cost, and aiding in combat communication under complex electromagnetic conditions.