Satellite Frequency Hopping Communication System on the Basis of GPS Time Service and Satellite Ephemeris

摘要

A Frequency Hopping (FH) communication method for uplink and downlink of satellite and ground station on the basis of GPS time service and satellite ephemeris is proposed. By adopting the SGP4 model to predict the satellite orbit, the relative position and velocity between satellite and ground station can be calculated precisely. The ground station completes pre-correction and compensation of the propagation delay and Doppler shift that have been estimated. The result shows that our proposed system performs lower hardware complexity and higher frequency hopping rate than traditional FH system. The propagation delay estimation precision is better than 250 ns. The Doppler shift estimation precision is better than 1 Hz. When the system cost is 1%, frequency hopping rate can reach 20000 Hops/s. The proposed system has strong anti-interference ability and strong anti-interception ability.