混沌跳频系统的时间同步方法

摘要

为了减小混沌跳频系统中的时钟误差,提高同步性能,提出了一个基于多点采样的检测器门限值的设置方法,该方法基于接收信号的概率密度分布,通过增加每个判决点的样本数量得到.分析了极大似然原理得出的单点采样门限值的局限性,通过增加样本数量,得出多点采样检测器的门限值设置方法.通过仿真表明,该方法能减小对采样信号判决时犯两类错误的概率,得出更小的归一化时钟均方误差.%To reduce timing error in chaos frequency hopping systems, improve the synchronization performance, a novel threshold setting method of multi-points sampling detector is presented. The method based on probability density distribution of received signal is implemented through increasing amount of determining points. Firstly, the limitation of single-point sampling threshold calculated according to maximum likelihood estimation is analyzed, then the threshold setting method of multi-points sampling detector is proposed by increasing the number of samples. Through the method, lower probability of two types of errors when processing sampled signal and smaller normalized mean square error of timing error are demonstrated by simulation.