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Method for detecting weak signal frequency value in background of strong noise by chaotic synchronization

A technology of chaotic synchronization and weak signals, which is applied in the direction of secure communication through chaotic signals, error detection/prevention using signal quality detectors, and secure communication devices. and other problems to achieve the effect of improving detection accuracy and efficiency and avoiding complex solutions

Inactive Publication Date: 2017-05-17
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, the detection of signals by existing chaos detection technology depends on the judgment of the operating state of the system, and the judgment of the operating state is difficult and usually requires a lot of time and calculations; need

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  • Method for detecting weak signal frequency value in background of strong noise by chaotic synchronization
  • Method for detecting weak signal frequency value in background of strong noise by chaotic synchronization
  • Method for detecting weak signal frequency value in background of strong noise by chaotic synchronization

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Embodiment Construction

[0021] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings and examples, but the implementation and protection of the present invention are not limited to this. Technically realized or understood.

[0022] This example adopts the chaotic synchronization method to detect the frequency of weak periodic signals, and builds the detection system based on the Chua circuit for further details.

[0023] refer to figure 1 As shown, this example builds a chaotic synchronization detection system and applies adaptive control technology to achieve chaotic synchronization between the driving end and the responding end, and the circuits at both ends run in a chaotic state; then, the driving end introduces the signal to be measured to detect the two ends of the system. Synchronization error, and perform Fourier transform on it to obtain the power spectral density, and realize the frequency detection of weak period...

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Abstract

The invention proposes a method for detecting a weak signal frequency value in the background of strong noise by chaotic synchronization. The method comprises the steps of firstly, constructing a chaotic synchronization signal frequency detection system, and adjusting system relevant parameters and controller parameters to allow the chaotic system run in a chaotic state at both a drive end and a response end synchronously; then, introducing a signal to be measured into the drive end of the chaotic synchronization detection system, and obtaining synchronization errors at both ends; and finally, solving the power spectral density by Fourier transform of the synchronization error data, and determining the frequency value of a weak periodic signal to be measured. According to the invention, the noise immunity and the synchronization of the chaotic system are used to suppress the large amount of noise, and the weak periodic signal to be measured is amplified. The signal-to-noise ratio of the synchronization error data is greatly improved compared with the signal to be measured, and the detection capability of the weak periodic signal frequency value in the background of strong noise is effectively improved.

Description

technical field [0001] The invention relates to the technical field of signal detection, in particular to a method for detecting the frequency value of weak periodic signals by combining chaos theory, synchronous control theory and power spectral density. Background technique [0002] The method of chaotic detection of weak signal is based on chaotic system, which uses its extreme sensitivity to initial value, immunity to zero-mean noise and nonlinear amplification characteristics for signal processing. Its essence is to analyze and utilize the chaotic state characteristics of the system and control and detect the operating state of the system. Such characteristics of chaotic systems are very suitable for solving various problems that are difficult to measure weak signals. [0003] Chaos detection technology is an important research direction of chaotic system applied to practical engineering. However, the detection of signals by the existing chaos detection technology dep...

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Application Information

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IPC IPC(8): H04L1/20H04L9/00
CPCH04L1/20H04L9/001
Inventor 李国正张波谢帆
Owner SOUTH CHINA UNIV OF TECH
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