A Novel Frequency Locked Loop Based on Stochastic Resonance
Frequency locked loop (FLL)plays an important role in carrier synchronization because of its excellent dynamic performance.However,it performs inadequately in low signal-to-noise ratio (SNR).In this paper,the principle of stochastic resonance (SR) is briefly introduced and a SR processor is proposed.Based on traditional FLL,the SR processor is added before frequency discriminator in order to weaken the effect that thermal noise brings to FLL.The paper investigates the processing effect of SR.Simulation results show that the performance of improved FLL is greatly improved.It can tolerate rather high dynamics and tracking accuracy of frequency achieve 0.2Hz even with CNR as low as 25 dBHz,which verified the validity of above ideas.
stochastic resonance carrier tracking frequency-locked loop low signal-to-noise ratio
Weitong Zhang Zhiqiang Li Wenming Zhu
Postgraduate Team 2, ICE, PLAUST Nanjing, China Department of space-based information system ICE, PLAUST Nanjing, China
国际会议
太原
英文
399-402
2013-04-06（万方平台首次上网日期，不代表论文的发表时间）