SUMMARY
In order to obtain new ways of weak signal detection, we analyze the motion of Duffing oscillator in the case of different input state by solving the Duffing equation firstly, and then elaborate the basic principles of weak signal detection based on Duffing oscillator phase-change characteristics. Further illustrate the experiment that shows how to achieve the weak signal detection with Duffing oscillator based on virtual instrument technology, then discuss the impact on signal detection coming from Gaussian white noise and how to implement weak signal detection with noises. The results show that, Duffing oscillator not only can be effective on detection of weak signal in the background of strong noises, but also has high cost performance to achieve it with virtual instrument technology. Compared with existing methods, it can greatly improve the detection results and has broad application.