Research On Anti-Jamming Technologies In Up-Link Receiver

Satellite navigation system involves space segment and ground segment. The up-link is more friable compared to down-link. By interfering up-link, the navigation signal can't broadcast correctly, and all users will be affected. This paper researches the anti-jamming technologies in up-link receiver. Firstly, anti-jamming technologies used in satellite communication are introduced. Then, an anti-jamming method, which combines the Adaptive Digital Beam Forming (ADBF) technique and jamming excision technique in baseband frequent domain, is proposed to improve the receiver's anti-jamming ability. Implement the adaptive filter in airspace, restrain the narrowband and broadband interference by using the ADBF technique. Restrain the remains jamming by using jamming excision technique. Finally, this paper demonstrates that using Ka-band as the work band in up-link is feasible. It implements the smooth transition between first-stage and second-stage, fulfills the aim to test new work band, and establish the foundation to choose the best up-link band in navigation system. Anti-jamming technology designed in this paper can solve the anti-jamming problem and enhance the reliability of up-link.