Collaborative Space-Time Anti-Jamming for the Uplink of Satellite Communications

In the face of increasingly dynamic, varied, and so-phisticated jamming attacks, conventional anti-jamming solutions are insufficient to ensure the reliability of satellite communication systems in a hostile jamming environment, leading to the vulner-ability of communication links. In this paper, a new space-time anti-jamming algorithm based on satellite collaboration is proposed. Firstly, an anti-jamming model for the uplink of satellite communications is developed, in which the inter-satellite collaboration is proposed for adaptive interference cancellation. The proposed method enables efficient joint space-time anti-jamming through the exchange of jamming information between reliable inter-satellite links. Secondly, we formulate the collaborative and joint space-time anti-jamming problem under the constraint of different Doppler shifts of jamming signals between the receiver and its collaborator. To solve this problem, we further propose a phased-array space-time anti-jamming algorithm which is jointly designed by the Doppler shift compensation to the jamming signal. Simulations over four types of jamming signals show the performance improvement and the robustness of the proposed method in anti-jamming compared with conventional phased-array beamforming in satellite communications.