基于随机共振原理的大频率微弱信号检测方法研究*

作者：刘进,赵文礼,夏炜 日期：2010-03-26/span> 浏览：2775 查看PDF文档

基于随机共振原理的大频率微弱信号检测方法研究*

刘进,赵文礼,夏炜
（杭州电子科技大学 机械工程学院,浙江 杭州 310018）

摘要：针对直接利用随机共振原理不能有效地检测出大频率微弱信号的问题，提出了利用混频器的频谱搬移特性，将待测的大频率信号和信号发生器产生的信号混频，从而使大频率信号转化为小频率信号，然后再加入非线性双稳态系统，对此方法进行了理论上的研究并设计出了混频随机共振电路系统。研究结果表明，基于此方法设计的电路能有效地检测出大频率微弱信号。
关键词：混频器；频谱搬移；双稳态系统；随机共振；微弱信号
中图分类号：TN911.23文献标识码：A文章编号：1001-4551(2010)01-0011-04

Study of weak highfrequency signal detection based on stochastic resonance
LIU Jin, ZHAO Wenli, XIA Wei
(School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China)
Abstract: Aiming at detecting the weak signal of high frequency using stochastic resonance theory ineffectively, spectrum shifting of the mixer was resorted, the signal of high frequency could be transformed into that of low frequency, the signal of high frequency to be detected and that produced by the signal generator were mixed; thus, the application of nonlinear bistable system was followed. The stochastic resonance circuit system was designed. The research results indicate that weak signal of high frequency can be detected effectively by adopting the circuit designed.
Key words: mixer; spectrum shifting; bistable systems; stochastic resonance; weak signal