随机共振锁频环路影响因素

针对随机共振锁频环路影响因素不够明朗的问题，在对随机共振锁频环路仿真验证的基础上，重点对信噪比、采样频率和系统参数对环路性能的影响进行了探究。首先，阐述了随机共振锁频环路基本原理，搭建了随机共振锁频环路模拟仿真平台。其次，通过设定不同的信噪比、采样频率和系统参数条件，观察随机共振锁频环路性能变化。最后，总结归纳出各条件对随机共振锁频环路的影响。仿真结果表明，信噪比越低，随机共振锁频环路对信号跟踪性能越差，且最低能够处理信噪比为Eb/N0=1dB的信号。采样频率在高于信号频率50倍时，提高采样频率虽可提高计算精度，但对环路跟踪性能改善作用不大。系统参数是决定随机共振效应能否发生及影响共振效果的关键因素，其表现为一个可供选择的数值区间。

Influencing Factors of Frequency Locked Loop Based on Stochastic Resonance

To ascertain the influence factors of Frequency Locked Loop (FLL) on Stochastic Resonance (SR), Signal to Noise Ratio (SNR), sampling frequency and system parameters were studied. First, the basic principle of FLL based on SR was interpreted and a simulation platform was set up. Second, through changing SNR and sampling frequency and system parameters, the influence that they bring about was clarified. Finally, significant conclusions are given. The tracking performance got poor with SNR declining, and the limit of SNR is Eb/N0=1 dB. The sampling frequency must be set 50 times higher than the frequency of signal, and the changing of sampling frequency had little effect on improvement of tracking performance. System parameters are the critical factors that influencing the performance of FLL based on SR, and it is present as an alternative numerical interval.