Frequency Hopping Communication Method for Satellites Using BeiDou Time Service and Ephemeris

In this paper, a novel Frequency Hopping(FH) communication scheme for communication between a satellite and ground station based on the Beidou time service and satellite ephemeris is proposed. Satellite orbits are predicted by the SGP4 model based on satellite ephemeris and the propagation delay and Doppler shift are estimated. The estimated results are used for pre-correction and compensation at the ground station. Results show that t propagation delay estimation accuracy is better than 300 ns, so the FH rate reaches 20 000 Hops/s with a cost of 1%. The normalized Doppler shift error is less than 1×10^-8. The proposed method can operate under low SNR conditions or strong jamming, as it does not rely on the pilot or sync head. This optimized scheme has lower complexity and better anti-jamming capability.