Research and Simulation on Weak Signal Detection Based on Duffing Oscillator and Damping Ratio Perturbation

摘要

The chaotic system is sensitive to the initial value,and this property can be applied in the weak signal detection.There are periodic,critical and chaotic states in a chaotic system.When the system is in the critical state,a small perturbation of system parameter may lead to a qualitative change of the system’s state.This paper introduces a new method to detect weak signals by the way of disturbing the damping ratio.The authors choose the duffing equation,using MATLAB to carry on the simulation,to study the changes of the system when the signal to be measured is added to the damping ratio.By means of observing the phase locus chart and time domain chart,the weak signal will be detected.