Pulse signal detection method based on double-extended Duffing oscillator

Abstract

The invention relates to a pulse signal detection method based on a double-extended Duffing oscillator. A to-be-detected signal is inputted into a first extended Duffing oscillator described by a state equation form and a second extended Duffing oscillator described by the state equation form keeps self-oscillation; because the disturbance on the first extended Duffing oscillator by the to-be-detected signal, a state out-of-step phenomenon of the first extended Duffing oscillator and the second extended Duffing oscillator is caused; and according to a difference between a state variable of thefirst extended Duffing oscillator and a state variable of the second extended Duffing oscillator, a pulse signal is detected. Therefore, a single pulse signal with a low- signal-to-noise ratio and anarrow width can be detected at the same sampling frequency.

Description

technical field [0001] The invention relates to the technical field of pulse signal detection, in particular to a pulse signal detection method based on double extended Duffing oscillators. Background technique [0002] How to extract signals from noise is an important link that cannot be ignored in many engineering technologies. The traditional methods include correlation method, wavelet denoising, spectral analysis, independent component analysis, etc., but the detection of signals using chaos theory has not been proposed for a long time. At present, chaotic signal detection is in its infancy, and the types and methods of signal detection need to be further advanced. [0003] There are few chaotic methods suitable for weak signal detection. Most of the detection methods use Duffing oscillators, and a few use Lorenz oscillators and Liu-like oscillators. This kind of chaotic signal detection method can only detect periodic signals, but cannot detect non-periodic pulse signa...

AI Technical Summary

Problems solved by technology

[0004] There are few studies on the detection of non-periodic pulse signals. Among them, a detection method based on the extended Duffing oscillator uses the phase transition of a single variable-scale Duffing oscillator to detect non-periodic pulse signals, which can detect signals with low signal-to-noise ratio. , but it can only detect the existence of the pulse, and cannot estimate the specific parameters of the pulse

A method that uses synchronous bursts between ring-coupled Duffing oscillators to detect non-periodic pulse signals is currently an effective method, but its detection signal-to-noise ratio threshold is high. In order to detect low signal-to-noise ratio signals, it needs to be increased Sampling frequency, high hardware requirements

Images