Abstract:

The influence of the frequency difference between the object signal and driving force of Duffing system is studied in blind detection of the weak signal submerged in the strong noise. The conclusion reaches that the phase trajectory evolution is in a periodic chaos state due to the frequency difference. Through the building of the normal and reverse phase oscillator detection equations and segmenting of the phase trajectory, an algorithm and a model to detect the weak signal blindly are proposed. The simulation experiment results show the efficiency of the blind detection algorithm.