【作者】 张云；

【导师】 汪建；

【作者基本信息】 华中科技大学 ， 电工理论与新技术， 2007， 硕士

【摘要】 在信号检测过程中,噪声往往被认为是有害的而想办法除去。但是,在过去的二十年中,随着随机共振概念的提出,传统的认识被认为是不完全的。实际上,在某些非线性系统中,添加合适的噪声却能够起到放大信号的作用,大大提高了输出的信躁比,这种在噪声环境中有利于检测的效应便是随机共振现象。随机共振是目前非线性学术领域中的一个新兴的重要分支。随机共振系统是一个非线性系统,在一个小的周期性调制信号作用下同时输入噪声和信号,当噪声增强到某一强度的时候,信躁比不仅不会降低,相反系统会产生随机共振从而使输出信号得到显著的增强。随机共振技术跟传统的信号检测方法相比具有很明显的优越性。本文首先介绍了随机共振研究的历史、现状和发展;阐述了随机共振的理论。随着人们对随机共振机理的进一步深入研究,随机共振技术将成为强噪声控制下的弱信号检测的一种新的技术。因此,系统地研究随机共振技术并应用到实际测量中去,是一项十分有意义的工作。本文在深入研究随机共振机理的基础上,将其拓展到工程应用性研究中去:设计一个基于ARM处理器的试验装置,用来仿真随机共振环境进行研究试验。这项工作为随机共振理论应用于实际工程现场的弱信号提取提供了基础。文中详细地介绍了系统的硬件和软件的设计方案和模块组成,完成了系统界面的设计以及软件相应的调试和测试。更多还原

【Abstract】 In daily life,noise is normally considered as a harmful factor for information detection. In last two decades,however,the discovery of stochastic resonance(SR) reveals the defect of this assertion, In certain nonlinear systems, addition of appropriate amount of noise can enhance signal to facilitate signal detection in noisy environments.Stochastic resonance is a new and very important embranchment in the nonlinear science field. SR system is a nonlinear system. Input the signal and noise into the system. With the noise being added to a proper value, the system will show stochastic resonance and enhance the output signal. The SR technology is better than the traditionary signal detecting method.This paper introduces the history, status and development of Stochastic resonance, and the statement of Stochastic resonance theory. With farther research into the Stochastic resonance mechanism, this technology is becoming a new technology for detecting weak signals overwhelmed in strong noise. So that, to study Stochastic resonance technology and apply it into actual signal detecting will greatly make sense. This paper researched the physics mechanism of SR and extend it to the field of engineering application: For simulating the SR circumstance, we designed a testing equipment that based on ARM processor. The job provide a foundation for the practical applying on detecting weak signals. This paper has introduced the design scheme and consisting modules of the hardware and software detailedly, Realization of the system interface and the debugging and testing of sofeware.更多还原