Weak pulse signal detection method based on improved strongly coupled oscillators

• DOI: 10.7498/aps.73.20231343
• Publication Date: 2023-12-08T06:03:16Z
• Authors: Yuan-Fang Li; Yuan Jiang; Lei Zhao
• Keywords: SIGNAL (programming language)

A strongly coupled oscillator can be used to detect weak pulse signals and recover waveforms, but its detection frequency of signal is limited by the system’s built-in frequency. With a fixed frequency, system only effectively in certain range, waveform distortion occurs when higher frequencies are detected. In this work, relationship between range analyzed, two kinds improved structures proposed extend signals. By introducing nonlinear restoring force coupling term, retain high-frequency component signal, also better characteristics input at Van der Pol-Duffing oscillator, two-oscillator strong strengthens stability internal structure system, achieves effect expanding signal. addition, based on variable iteration step size correlation chaos detection, method detecting unknown proposed. Instead changing for scanning, used. And using coefficient received recovered compared with pure noise case, then detected apparent difference coefficients. It verified simulation experiments that has greater performance improvement than oscillator.