一种车载超短波电台的跳频同步方法

Hopping Synchronization of Vehicle Ultra-Shortwave Radio

为解决传统参考时钟同步法用于车载超短波跳频电台时因电波传输延时不确定性带来的问题,基于分段同步的思想,提出一种多支路并行同步的改进方法.通过将最大通信距离划分为多个连续区间,在每个区间设计独立的同步支路并预设延时值,各支路并行工作,保证同步可靠性的同时有效消除电波传输延时带来的问题.以50km最大通信距离(即167μs的电波传输延时)、5条支路进行了同步仿真.结果表明,同传统参考时钟法相比,跳频速率由6 000hop/s提高到25 000hop/s,同步时间缩短28%,检测概率有显著提高.

In order to solve the problems caused by the uncertainty of radio transmission delay when the traditional reference clock synchronization method was used in vehicle ultra-shortwave hopping radio,this paper presents an improved multi-branches parallel synchronous method which was based on the idea of segment sync.By dividing the maximum communication distance into several continuous intervals and designing independent synchronous branch for each interval,the method ensured the reliability of synchronization and eliminated the negative effects caused by radio transmission delay.Synchronized simulation was conducted with the maximum communication distance of 50km（radio wave propagation delay of 167μs）and 5branches.The results show that compared with traditional reference clock synchronization method,the frequency hopping rate increases from 6 000hop/s to 25 000hop/s,synchronization time reduces by 28% and detection probability is significantly improved.