Study on the weak sinusoidal signal detection with Duffing chaotic oscillator
Zhou Ling · Systems engineering and electronics · 2006
To estimate the amplitude and phase of weak sinusoidal signals with known frequency,a method using Duffing chaotic oscillator as the detection system is proposed.In this case,the detected signal is taken as a system parameter.The system's output state changes if the system parameter has a slight change near the threshold.The phase of system's output is recognized to judge whether the output state changes,and the signal parameter is estimated according to the necessary condition for state change.The procedure of detecting weak signals with this method is proposed.The sea echo signal of high frequency ground wave radar(HFGWR) is detected with this method.The result demonstrates this method has a better detection performance by comparing the results with the results got by FFT algorithm,and the signal to noise ratio(SNR) of Doppler spectrum is improved by 5 dB.