High Doppler to Bandwidth Ratio Signal Detection Technique in a Satellite Communication System

Due to the low-orbit satellite high velocity, the amount of Doppler frequency offset can not be neglected, especially in the case of narrow signal bandwidth and wide radiation pattern beam. If the direction to the signal source is unknown, there is no a priori information to compensate for the offset on the fly. The paper proposes a combination of approaches, which in conjunction provide a robust technique to determine the frequency offset and synchronization by the signal itself and its constituting data. The technique was implemented in an FPGA logic and showed stable results in the experiments. With minor adjustments, it may be expanded to similar communication systems.