一种基于低轨卫星通信的定时同步研究

Research on Timing Synchronization for LEO Satellite Communication

定时恢复是数字接收机中的关键技术,基于某特定LEO低轨卫星通信系统应用,重点研究了异步时钟采样恢复法的工作原理,提出了一种改进的Gardner定时误差检测算法,给出了整个定时环路的具体实现方案,并针对其性能进行了分析。仿真结果表明,在大多普勒加速度的卫星信道环境下,该方案能够满足系统设计的要求,且实现结构简单、优化,可大幅降低算法复杂度,在较高信噪比的情况下,具有更加优化的性能。

Timing recovery is one of the most important technologies in digital receivers. Based on a certain LEO satellite communication system, this paper studies the principle of the asynchronous sampling synchronization, brings forward a modified Gardner timing error detection algorithm and gives the detailed realization scheme of timing synchronization. The simulation result shows that the method can reduce the complexity of the algorithm and meet the system requirement in the environment of large Doppler acceleration of the satellite＇ s channel, and this method can have better performance in the case of high SNR.