Self-adapting random resonant weak signal detection method

A technology of weak signal detection and stochastic resonance, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc.

Inactive Publication Date: 2008-06-04
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems faced by stochastic resonance technology in detecting weak characteristic frequency signals in engineering practice, and provide an adaptive stochastic resonance weak signal detection method

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  • Self-adapting random resonant weak signal detection method

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Embodiment Construction

[0028] The self-adaptive stochastic resonance weak signal detection method of the present invention uses the method of combining the best matching stochastic resonance and the stochastic resonance induced by an external signal to realize the self-adaptive detection of the weak characteristic frequency signal. The steps are as follows:

[0029] 1. According to the stochastic resonance theory of the bistable system, the numerical simulation is carried out to obtain the corresponding relationship between the noise intensity and the frequency of the bistable system best matching stochastic resonance under the condition of small signal in the extremely low frequency range.

[0030] The nonlinear bistable system driven by periodic signal and white noise essentially describes the movement of a particle in a symmetrical double potential well when it is driven by external force and noise at the same time.

[0031] A bistable system can be described by the Langevin equation:

[0032] ...

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Abstract

The invention discloses a self-adapting random resonance weak signal detection method, which achieves the self-adapting detection of weak periodic signal through combining a matching random resonance and an imposed signal induced random resonance. According to the theory of random resonance, firstly, numerical simulation is processed to receive correspondence between the noise intensity and the frequency of the best matching random resonance of a nonlinear bistable system in a range of extremely low frequency and under the condition of small-signal; and a high-frequency weak signal encountered in a project can be processed by using the change of normalized scale. For the detection of a weak signal with extremely low message-to-noise ratio and large noise intensity, the heights of voltage barriers of the bistable system can be changed by using the induced random resonance, thereby helping a weak eigenfrequency signal to fulfill the transition between voltage barriers, so that the bistable system reaches the random resonance state, thereby achieving the self-adapting detection of the weak periodic signal.

Description

technical field [0001] The invention belongs to a method for detecting weak characteristic frequency signals under the condition of low signal-to-noise ratio, in particular to a method for detecting weak periodic signals by using self-adaptive stochastic resonance. Background technique [0002] Stochastic resonance technology was proposed by Italian scholars Baz and others in the 1980s when they were studying the changes in the earth's ancient climate. It refers to a nonlinear bistable system, when only the noise or only the small period signal is not enough to make the system output jump between two stable states, and under the joint action of the noise and the small period signal, the system output In the power spectrum of the signal, a peak appears at the frequency of the signal. When the noise intensity reaches an appropriate value, the peak of the output power spectrum reaches the maximum. The appearance of the peak is due to the transfer of noise energy to signal energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16G01R23/177
Inventor 温熙森胡茑庆陈敏杨定新杨拥民秦国军邱静胡政刘冠军胡海峰
Owner NAT UNIV OF DEFENSE TECH
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