Chaotic and filtering system combined weak signal detection method

Abstract

The invention discloses a chaotic and filtering system combined weak signal detection method. An acoustic wave transmitter transmits a group of weak cosine or square wave acoustic wave signals of which the frequency is w to an acoustic wave receiver, and the acoustic wave receiver converts the signals into cosine wave or square wave electrical wave signals of the same frequency to be inputted to a Duffing-Homes chaotic system; the parameters of the Duffing-Homes chaotic system are adjusted before receiving signals so that the voltage waveform outputted by a variable y is enabled to be chaotic waveform; if the voltage waveform outputted by the Duffing-Homes chaotic system y is changed into the cosine electrical wave waveform of which the frequency is w from the chaotic waveform, the filtering system outputs the cosine electrical waves of the same frequency, which indicates that the acoustic wave receiver receives a weak signal of which the frequency is w; and if the voltage waveform outputted by the chaotic system variable y still is the chaotic waveform, the chaotic electrical waves are filtered by the filtering system, and the filtering system outputs 0V voltage, which indicates that the acoustic wave receiver does not receive any weak signal. According to the method, the conventional detection technology can be replaced so that detection of the weak cosine wave or square wave acoustic wave signals can be guaranteed.

Description

technical field [0001] The invention relates to signal detection technology, in particular to a weak signal detection method combining chaos and filtering system. Background technique [0002] In weak signal detection, the traditional method is to amplify and filter the weak signal first, and then detect and identify it. This detection method has weak anti-interference ability and cannot identify too weak cosine wave signal, the detection effect is not good, and the filtering processing equipment is expensive. At present, people have verified the feasibility of using Duffing-Homes chaotic system for signal detection. However, since the output voltage waveform of the Duffing-Homes chaotic system has only two states, chaotic and periodic, and the waveforms of these two states are very close and difficult to be quickly distinguished, it cannot be used for weak signal detection. Contents of the invention [0003] The purpose of the present invention is to provide a weak sign...

AI Technical Summary

Problems solved by technology

However, since the output voltage waveform of the Duffing-Homes chaotic system has only two states, chaotic and periodic, and the waveforms of these two states are very close and difficult to be quickly distinguished, it cannot be used for weak signal detection

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