物理学报2012，Vol.61Issue(18)：45-51,7.
基于混沌和随机共振的微弱信号检测
Weak signal detection based on chaos and stochastic resonance
摘要
Abstract
The frequency invariance and phase shift of the first-order steady state moment of system response are deduced for fractional order linear oscillator. Moreover, through the theoretical analysis, the amplification effect of fractional order linear system on the amplitude of first-order steady state moment is verified in stochastic resonance mechanism. Duffing detector is used to realize weak signal detection based on parameter perturbation sensitivity and noise immunity of chaos. Numerical simulations show that this scheme can effectively extract the weak sinusoidal signal from the strong colored noise background and significantly reduce the signal-to-noise ratio threshold in comparison with traditional chaotic detection method.关键词
弱信号检测/随机共振/混沌/分数阶Key words
weak signal detection/stochastic resonance/chaos/fractional order分类
数理科学引用本文复制引用
高仕龙,钟苏川,韦鹍,马洪..基于混沌和随机共振的微弱信号检测[J].物理学报,2012,61(18):45-51,7.基金项目
国家自然科学基金支持项目（批准号：11171238）和中国博士后科学基金（批准号：201104693）资助的课题. （）
