随机共振锁频环路影响因素  

Influencing Factors of Frequency Locked Loop Based on Stochastic Resonance

作　　者：张卫同[1,2] 李志强 陈欢[3] 石盛超 ZHANG Weitong;LI Zhiqiang;CHEN Huan;SHI Shengchao(Department of Space-Based Information System,ICE,PLAUST,Nanjing 210007;PLA Unit 66008,Tianjing 300171;Luoyang Electronic Equipment Test Center,Luoyang,Henan Province 471000)

机构地区：[1]解放军理工大学通信工程学院天基信息教研中心,南京210007 [2]66008部队,天津300171 [3]洛阳电子装备试验中心,河南洛阳471000

出　　处：《飞行器测控学报》2017年第5期335-341,共7页Journal of Spacecraft TT&C Technology

基　　金：国家自然科学基金(No.61571464)。

摘　　要：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,重点就信噪比、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的基本原理,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的性能变化。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=1 dB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。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.

关 键 词：随机共振 锁频环(FLL) 信噪比(SNR) 采样频率 系统参数 

分 类 号：V556[航空宇航科学与技术—人机与环境工程] TN911.8[电子电信—通信与信息系统]