基于FPGA的短波跳时跳频系统同步的实现

摘要

短波跳时跳频信号具有频率不断变化和发信时间随机的特性,能够很好地实现通信信号的隐蔽,具有较强的抗截获抗干扰能力,但是跳时技术会导致整体的发信时间被延长。为尽量缩短发信时间,对以往的同步序列＋TOD信息的同步方法进行改进,提出一种帧同步序列与跳时跳频伪随机码一一对应,采用滑动窗相关检测进行同步的方法,在FPGA中实现了该同步系统,并对该系统进行了仿真。%The HF signal that uses time hopping and frequency hopping technology is very covert,and has a strong anti-jamming and anti-intercept capability,because of its changing frequency and pseudo-random signal sending time,but the time hopping technology will lead to the extension of the total sending time.To shorten the sending time,a new synchronization method is proposed.The frame synchronization sequence corresponds to the time hopping and frequency hopping pseudo-random code one by one,and sliding window correlation detection is used for synchronization.This synchronization system is implemented with FPGA and simulation is performed.