Research On Weak Unknown Signal Detection Technology Based On Chaotic System

Chaotic system detection technologywhich is one of the most advanced technology,caused the research upsurge in the field of weak signal detection. Since it was proposed in1990,numerous scholars had devoted themselves to do research in this area by proposing many detection algorithms based on chaotic system.Based on the previous study, this paper does some in-depth study of chaos detection.Faced with the problem that in the process of chaotic system the frequency value of the signal under test always must be known.this paper proposed three new algorithms to detect the frequency of periodic signal under the circumstance that its frequency is unknown to us.The specific innovations are as follows;(1)An algorithm of double system detection algorithm which combined Stochastic resonance system and Duffing chaotic system. With this method,the frequency of the unknown signal is extracted,which will be used as the transcendental value of Duffing chaotic system while testing.Then the periodic signal is testified and the corresponding useful parameters are extracted by the Duffing chaotic system. Experiments show that the method has high accuracy and robustness to the unknown signal detection.(2)A kind of chaos detection algorithm using chaotic adaptive synchronization system is proposed.Response system and control system are set to be synchronous by using Chaos adaptive synchronization technology. Then the response parameters in the control system is estimated by the response system parameter values.Farther more,1useful parameters of the under test signal included in the control system will also be estimated.The advantage of this method is that it can detect and extract the unknown signal in the same system,which increased the accuracy and simplicity of extraction.(3) Building upon the chaotic synchronization periodic signal detection,NBS system to detection the chaotic synchronization unknown periodic signal us proposed.By the introduction of the NBS system, under test signal in the Chaos system can be acted as a single and unknown parameter to avoid the error caused by the constant value.The method of unknown periodic signal detection research provides a very high value.