高动态跳频信号时钟同步设计与实现

Design and Implementation of High-dynamic Frequency-hopping Signal Clock Synchronization

由于跳频信号各跳之间的符号速率和符号数量不一致,特别是低速跳只含少量符号,导致时钟误差提取困难。针对高动态下的跳频信号时钟同步难题,提出基于频偏估计的钟偏反馈调整方法。该方法通过同步序列进行频率估计和钟偏估计,并结合反馈方法调整钟偏和时钟跟踪,实现了高精度时钟同步。仿真结果表明:该方法适应飞行速度7.9 km/s、加速度0.2 km/s2的超高动态,定时同步性能优越,定时精度满足高速跳频信号解调要求,且解调损失小于0.1 dB。

Due to the inconsistency in symbol rate and count between the hopped signals,especially with few symbols in lowspeed hops,it is difficult to extract clock errors.To address the clock synchronization challenge of frequency hopping signals under high dynamics,a method based on frequency offset estimation for clock offset feedback adjustment is proposed.By estimating the frequency and clock offset through synchronization sequences and adjusting the clock offset and clock tracking through feedback methods,high-precision clock synchronization is achieved.Simulation results show that this method is suitable for ultra-high dynamics with flight speeds up to 7.9 km/s and accelerations of 0.2 km/s²,exhibiting superior timing synchronization performance.The timing accuracy meets the requirements for high-speed frequency hopping signal demodulation,with demodulation loss less than 0.1 dB.