Weak signal detection method based on inverse phase transition of Duffing oscillator

Abstract

The present invention relates to a weak signal detection method based on the inverse phase transition of the Duffing oscillator, and mainly solves the technical problems that method in the prior art is complex and needs to rely on the precise critical threshold. The technical scheme of the present invention is that, by constructing two groups of detection oscillators of inverse phase transition that satisfy the specific relation, a detection array is composed, so that detection of to-be-detected signals and measurement of amplitude values are realized by collecting statistics of the number of the oscillators with or without phase transition; and according to the reference signal of the oscillators and the vector synthesis relationship among the to-be-detected signals in the array, a detection result is calculated, so that the technical problem is better solved, and the method can be applied to the detection of the amplitude of the weak sine signal with known frequency.

Description

technical field [0001] The invention relates to the field of signal detection, in particular to a weak signal detection method based on the reverse phase transition of Duffin oscillators. Background technique [0002] The Duffin oscillator is a nonlinear vibration equation, and its phase trajectory can appear in sequence with the increase of the driving force amplitude, such as homoclinic orbit, bifurcation, chaotic motion, and large-period motion. It is one of the commonly used models for studying chaos. . The state transition between the chaotic state and the large-period state of the Duffin oscillator is extremely sensitive to periodic signals and has a certain immunity to noise. The weak signal detection method of Duffin oscillator is to use this characteristic to detect weak signals. At present, there are mainly two basic methods for weak signal detection of Duffin oscillators: forward phase transition detection method and reverse phase transition detection method. T...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the existing detection technology needs to rely on the critical threshold that meets the accuracy requirements, but the process of obtaining it is cumbersome and difficult, and the setting of the critical state of the Duffin oscillator is ambiguous, which is easy to introduce human For the technical problem of subjective factors, a new signal amplitude detection method is provided, which has the advantages of avoiding the dependence of the detection process on the precise critical threshold, avoiding the need to set the vibrator to a critical state during the detection process, no detection blind zone, simple process and automation High degree of characteristics

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