【摘要】 近几年在计量学中出现了一种新的基于杜芬振子的信号检测方法,它能提高检测能力和精度;杜芬振子是一种混沌系统,系统参数在其阈值附近的微变会引起系统状态的突变,此特性使得它对相似频率的信号敏感,而对噪声和干扰具有"免疫力",因此可利用阵发混沌原理测量正弦信号的频率;为提高频率测量精度,创造了过零点间隔法和伪区域去除法等新算法,分析了噪声对测量结果的影响,分析误差产生原因,优化算法参数取值,这都能减小测量误差;仿真实验证明精度高于经典频率测量方法。更多还原

【Abstract】 In recent years,a new signal detection method based on Duffing oscillator has appeared in metrology,which has stronger detection ability and higher detection precision.The Duffing oscillator is a chaos system,whose state changes largely when the system parameter changes slightly around its threshold.So the oscillator is sensitive to signal with similar frequency and has immunity to noise and other signals.Then intermittent chaos principle is used to measure frequencies of the weak sinusoidal signal.To measure the frequency accurately,several new arithmetics are created and used,such as interval of zero-cross points,deletion of fake area.Experiment proves the result is more precise than that of typical frequency measurement method.更多还原