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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 problem that the traditional reference clock synchronization method brings about the uncertainty caused by the delay of radio transmission when used in VHF radio frequency hopping car, an improved multi-leg parallel synchronization method is proposed based on the idea of segment synchronization. The communication distance is divided into a plurality of continuous intervals, designing independent synchronous branches in each section and presetting delay values, and the branches work in parallel to ensure the synchronization reliability and effectively eliminate the problems caused by the transmission delay of the radio waves. 50km maximum communication distance (ie, 167μs radio propagation delay), five branches were simulated simultaneously.The results show that compared with the traditional reference clock method, the frequency hopping rate from 6 000hop / s to 25 000hop / s, synchronization time Shortened by 28%, the detection probability is significantly improved.