噪声背景下单稳系统的信号检测和恢复

Signal detection and recovery of a monostable system in noise background

针对单稳系统输出波形失真的问题,提出一种有效的信号恢复方法.通过调整双稳系统的结构参数得到单稳系统.对单稳系统输出波形失真的原因进行详细阐述,并以正弦信号为例说明其恢复机理.此外基于该恢复方法分别对类正弦信号和类脉冲信号进行数值模拟.模拟结果表明该理论分析有效,恢复信号与原始信号具有较好的一致性,表明单稳系统恢复方法能够有效地估计噪声背景下微弱信号的时域波形,在工程实际应用中具有较好的前景.

An effective method of signal restoration is proposed,aiming at the problem of output waveform distortion of monostable system.The monostable system is obtained by adjusting the structural parameters of the bistable system.The causes of output waveform distortion via monostable system are elucidated and the recovery mechanism is illustrated in detail by the example of sinusoidal signal.Furthermore,numerical simulations are implemented based on the recovery method,the sine-like signal or the pulse-like signal are all discussed.The results of numerical simulations verify the validity of the theoretical analysis,in which the recovery signal and the original signal are in good agreement.It shows that the proposed method can effectively estimate the time domain waveform of weak signal in the context of noise and has a good prospect in the practical application of engineering.