一种抗飞行器衰落的定时恢复技术研究

Research on Timing Recovery Overcoming Aircraft Fading

对流层散射通信信道是时变多径信道,当飞行器经过散射公共体时会导致飞行器衰落。为了对抗飞行器衰落,在研究自适应均衡算法的基础上,提出在定时恢复环路中采用抽头跟踪定时误差检测算法。通过自适应均衡算法消除码间干扰、跟踪信道变化,定时误差检测算法跟踪均衡器抽头的变化情况进行定时恢复,从而使采样时刻位于最佳位置。仿真结果表明,该方法能够对抗飞行器衰落,实现定时恢复。

The channel of troposcatter communications is characterized by multi-path and time-varying.Aircraft fading arises from aircraft navigating scatters.In order to overcome aircraft fading,a timing recovery method,tap tracking timing recovery,is proposed.This method is based on adaptive equalizer.The adaptive equalization algorithm can eliminate intersymbol interference caused by aircraft fading channel,and time error detection algorithm tracks the tap to recover the clock,and maintains the timing phase situating in the right place.Simulation results show that this method can overcome aircraft fading,and recover the timing phase.