An improved Liu chaotic circuit for weak signal detection
Key Lab of Industrial Computer Control Engineering of Hebei Province, Yanshan University, Qinhuangdao, China
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Accepted: 24 January 2019
Published online: 14 May 2019
By inserting the cosine function to the right of the first row of the Liu chaotic system, a kind of new improved Liu chaotic circuit for weak signal detection is designed. The problems of the non-convergence of the output signal waveform and the narrow area detection by the traditional Duffing chaotic circuit for weak signal detection are resolved by the improved Liu chaotic circuit. The convergence and wide area detection of the improved Liu chaotic system are analyzed by the Flourier transform method, and they are proved by the Matlab simulation. The actual detection experiments show that the acoustic signal can be detected in wide area, the narrow-band noise interference can be overcome and the distorted acoustic signals can be detected by the designed improved Liu chaotic circuit for weak signal detection. The weak signal detection ability of the improved Liu chaotic circuit is superior to the traditional Duffing chaotic circuit. The new design concept of the improved Liu chaotic circuit shows a very high value for engineering application.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2019