
Application of Chen's system to detecting weak harmonic signals
Author(s) -
Mengjiao Wang,
Yicheng Zeng,
Changqing Xie,
Zhu Gao-Feng,
Shuhong Tang
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.180502
Subject(s) - harmonic , noise (video) , physics , chaotic , chen , harmonic oscillator , range (aeronautics) , computer science , control theory (sociology) , statistical physics , acoustics , quantum mechanics , artificial intelligence , paleontology , materials science , control (management) , composite material , image (mathematics) , biology
The detection of weak harmonic signals has important practical value. In this paper, the detection of weak harmonic signals in strong noise is realized with the controlled Chen's system. Dynamics can be divided into slowly varying dynamics and fast varying dynamics, so a slowly varying dynamics is obtained by an averaging method. The critical values of detection parameters are determined, which lead to a sudden change of system dynamical behavior from periodic orbit to stable equilibrium point. Weak harmonic signals can be detected by adjusting the detection parameters and observing the change of system variables. Simulation results show that weak harmonic signals in strong noise can be detected accurately with this system. Compared with existing detection methods with chaotic oscillator, this method is of stronger immunity to noise, and the accurate range of parameter threshold can be obtained through theoretical analysis, which enables its popularization and application in relevant fields.