调制随机共振及其在微弱信号检测中的应用  

Modulated stochastic resonance and its application in weak signal detection

作　　者：林敏[1] 黄咏梅[1] 

机构地区：[1]中国计量学院计量技术工程学院,浙江杭州310018

出　　处：《传感器与微系统》2006年第2期81-82,共2页Transducer and Microsystem Technologies

基　　金：浙江省自然科学基金资助项目(Y104338);浙江省科技计划项目(2004C31032)

摘　　要：根据非线性双稳系统只能在低频段产生随机共振的特性,提出了调制随机共振方法,实现了在较宽的频率范围内检测微弱信号。理论分析和实验结果表明:经调制产生的低频信号通过双稳系统的协同作用而形成的输出信号,其能量和信噪比都有显著提高,对强噪声中的微弱信号有较强的检测能力。采用该方法可进一步开发双稳系统低频段的信息资源,拓宽其应用领域。A modulated method based on stochastic resonance is put forward to detect the weak signals in rather broad frequency range, according to the characteristic of stochastic resonance produced in rather low frequency range in nonlinear bistable system. The theory analysis and experiment results show that the energy and SNR of the output signal modulated synergetic effect are both improved evidently, and the ability of detecting weak signals with strong noise is enhanced. This method can be adapted to develop the information resources of nonlinear bistable system within low frequency range.

关 键 词：调制随机共振 微弱信号检测 故障诊断 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]