Research on Timing Synchronization Algorithm for Frequency-hopping Signals Under Doppler Effect
The relative high-speed movement between transmitting and receiving parties can affect the synchronization and demodu-lation of received signals,especially for frequency-hopping signals with symbol rates that change with each hop.To address the issue of clock synchronization for frequency-hopping signals in high-dynamic scenarios,this paper analyzes the impact of Doppler-induced clock offset on clock synchronization.A timing synchronization method is proposed,which combines clock frequency estimation based on syn-chronization information and clock phase estimation.Estimation results are then subjected to Kalman filtering to estimate the clock offset and its rate of change,allowing real-time tracking and adjustment of the receiver clock to achieve synchronization with the transmitted signal.Finally,simulations and comparisons with a third-order phase-locked loop are conducted.Simulation results demonstrate that the proposed method has a larger tracking range,higher estimation accuracy,and better demodulation performance compared to traditional phase-locked loop methods.The demodulation performance loss is less than 0.2 dB compared to the theoretical value.
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