Weak signal detection based on Duffing oscillator phase transition rate

The existing Duffing oscillator weak signal detection method will lead to the degradation of detection performance when the noise is strong. In order to reduce detection signal-to-noise ratio and improve the detection performance, a weak signal detection method based on Duffing oscillator phase transition rate is proposed. This method uses the phase transition rate of Duffing oscillator to judge, which can effectively reduce the detection error caused by pure noise, and further improve the performance of weak signal detection. Compared with the existing methods, the lower limit of detection signal-to-noise ratio is reduced by 2dB.