Weak wide-band signal detection method based on small-scale periodic state of Duffing oscillator
Hou Jian, Yan Xiao-peng †, Li Ping, Hao Xin-hong
       

(color online) Time series of the to-be-detected signal and the sine cosine curves (a) sinusoidal signal 0.004 cos ( 2 π × 1000 t ) without noise; (b) at −20 dB of SNR; (c) at −45 dB of SNR; (d) at −50 dB of SNR.