A Method of Weak Signal Detection Based on Duffing Oscillator
A new signal detection and estimation method based on the intermittency transition between order and chaos is proposed Using Melnikov function to determine the threshold of the detection system is introduced. The characteristic of Duffing oscillators with the changing of dynamics of the system is analysed. The method of detection of weak signals in strong noise based on Duffing oscillators is studied by exploiting characteristic of phase changing from chaos state to great periodic state of system nearby critical coefficient. Through analysing the intermittent chaos mechanism of Duffing oscillator,it was found that the system output is a intermittent chaotic signal when input frequency deviates the compulsory drive frequency slightly,and the deviation can be estimated by the statistic characteristic of output chaotic signal. The experiments results indicate that the signal detection method based on Duffing oscillator can detect weak sinusoidal signals with extremely low signal to noise ratio and accurately calculate to-be-detected signal frequency.
weak signals Duffing oscillator Melnikov function intermittent chaos
Chu-lin Hou De-shi Wang
Department of Weaponry Engineering,Navy University of Engineering
国际会议
2009 IEEE 8th International Conference on ASIC(第八届IEEE国际专用集成电路大会)
长沙
英文
1157-1160
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）