基于随机共振的混合频率微弱信号检测  

Detection of mixed-frequency weak signal based on stochastic resonance

作　　者：缑新科[1] 马艳[1] 

机构地区：[1]兰州理工大学电气工程与信息工程学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2016年第2期97-100,共4页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51165024)

摘　　要：非线性随机共振系统,为高噪声背景下微弱信号的检测提供了新方法.由于在检测微弱信号时受小频率参数和微弱信号幅度的约束,给实际应用带来了很大的困难.针对这一问题,利用归一化变换的随机共振微弱信号检测方法,通过引入归一化变换因子,消除随机共振系统对待测信号频率的限制,实现在高噪声背景下,混有高、低频待测信号的检测.理论分析和仿真结果表明:对埋在高噪声中的高、低频混合微弱信号,采用归一化变换,获得一个适当的输入信号到随机共振体系,通过输出信号的频谱分析检测出来,构建了一种可实现的高低频混合的微弱信号检测方法.Nonlinear stochastic resonance system can provide a new method for detection of weak signal in high noise background.Due to the constraint of the small frequency parameters and weak signal amplitude for weak signal detecting,a significant difficulty will take place for its practical application.Aimed at this problem,the method of stochastic resonance weak signal detection with normalized transformation is used to eliminate the limit set by stochastic resonance system to the measured signal frequency by introducing a factor of normalized transformation,and realize the detection of the weak signal with mixture of small frequency and large frequency in high noise background.Theoretical analysis and simulation result show that using the normalized transformation,an appropriate input signal to the stochastic resonance system can be obtained from the high-and low-frequency mixed weak signals buried in high noise.By means of analyzing the frequency spectrogram of output signal,a realizable method for detection of mixed frequency weak signal will be constituted.

关 键 词：随机共振 混合频率 归一化变换 频谱分析 

分 类 号：TN911.23[电子电信—通信与信息系统]