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针对频率调制中存在的门限效应问题,提出了利用非线性科学领域的随机共振原理来降低门限值。首先将接收到的频率调制信号通过一低通滤波器,提取出其中的低频分量,然后输入非线性双稳态系统中,通过调节载波频率,使得系统发生随机共振,多次调节载波频率,可以有效的检测出有用信号的频率。理论分析和仿真结果表明该方法能有效降低频率调制的门限值,并且克服了随机共振不能检测大频率信号的缺点。
In order to solve the threshold effect problem in frequency modulation, the stochastic resonance principle in nonlinear science is proposed to reduce the threshold. First, the received frequency modulation signal is passed through a low-pass filter to extract the low-frequency components, and then input into the nonlinear bistable system. By adjusting the carrier frequency, the system makes random resonance and adjusts the carrier frequency multiple times. Effectively detect the frequency of useful signals. Theoretical analysis and simulation results show that this method can effectively reduce the threshold of frequency modulation and overcome the shortcoming that random resonance can not detect large frequency signals.