摘　要: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。

-Abstract: The timing recovery is a key technology in the digital receiver, based on a particular application of LEO LEO satellite communication system, focus on the asynchronous sampling clock recovery method works, a modified Gardner timing error detection algorithm, given a concrete realization of the regular loop programs, and analyzed for its performance. Simulation results show that the acceleration of the satellite channels in large Doppler environment, the program can meet the requirements of system design and realization of simple structure, optimization, can significantly reduce the complexity of the algorithm, in the case of high SNR, with more optimized performance.