基于双稳类随机共振的信息检测

研究了小参数随机共振(SR)的响应幅值与信号频率和噪声强度的关系,并从噪声频谱的罗伦兹(Lorentz) 分布特性推出,只有在噪声能量集中的低频区域才能产生随机共振的论点。得出了二次采样大参数类随机共振的实现条件,即采样频率至少是信号频率的50倍并根据噪声强度选择二次采样频率。在大参数情况下,由双稳系统输入输出信噪比的分析,阐明了大参数类随机共振方法从强噪声中检测出弱信号的可行性。运用周期和非周期弱信号的检测实例,进一步证明了该方法的有效性和实用性。

Information Detection Based on Bistable SR-Like Technique

For small parameter Stochastic Resonance (SR), the relationship among the response amplitude and signal frequency and noise intensity is investigated. The viewpoint of creating SR phenomenon only in the low frequency region where noise energy has been concentrated is also obtained in terms of the Lorentzian distribution of noise power spectrum. The condition of realizing twice sampling large parameter SR-like phenomenon is deduced, i.e., sampling frequency is fifty times signal frequency at least, and twice sampling frequency should be selected according to noise strength. Under large parameters, the analysis of input and output signal-to-ratios of the bistable system indicates the possibility of detecting weak signal submerged in heavy noise with the large parameter SR-like technique. And it is further proved that the technique is effective and practical by means of the examples of the extraction of periodic and aperiodic signals.