Chaos-Based Weak Signal Detection Method and Virtual Instrument-Based Weak Ultrasonic Signal Detecting System

摘要

Through analyzing the intermittent chaos mechanism of Duffing oscillator, it was found that the oscillator phase transform is sensitive to the small signal having the tiny angular frequency difference, but insensitive to the random noise and the larger interference signal having larger angular frequency difference. A new weak signal detecting method is advanced hereby. The detectable signal-to-noise ratio is increased. The virtual instrument-based weak ultrasonic signal detecting system has been built up. The validity of this weak signal detecting method has been verified.