The Design And Implement Of The Adaptive Stochastic Resonance System

In recent years using the perverse effect of the stochastic resonance(SR)in weak signal detection under the complex background of noise has attracted much attention.In engineering practice,the relevant information about the signal and the noise cannot be got.However,whether the system parameters can be automatically adjusted by the SR system according to various signals,i.e.,the adaptive SR occurs.The classical SR system can only handle the signal whose frequency is far less than 1Hz,but in engineering practice it is often encountered that high frequency weak signal detection problem,thus parameter compensation is adopted to detect the high frequency signal.As is known,DSP has high speed digital processing capabilities.So it is of great importance to transplant SR theory into DSP,reducing the distance between theory and practical engineering.In this paper,parameter compensation SR for high frequency signal detection is studied firstly,the signal-to-noise gain SNRI is taken as the measurement index,and the relationship between compensating parameter and SR is explored,and the fixed compensating parameter is given when signals in different frequency range;the analog circuit based on Multisim of the parameter compensation SR is designed,different simulation results can be got by adjusting parameter compensation;combined with parameter compensation SR,the adaptive SR is used to detect single-and multi-high weak signals respectively,and the results show that combining with parameter compensation SR,using knowledge-based particle swarm optimization as adaptive algorithms,and taking SNRI as the fitness function,the adaptive SR can detect single-and multi-high weak signals.Then combine DSP with the adaptive SR,and describe the system from the hardware part and software part respectively.In hardware design part,TMS320C6713 is the core,including A/D conversion part,storage part,communication part and display part;In software design part,firstly the system software design flow chart of the adaptive SR based on DSP system is given,secondly communication part is described in detail,including the design of upper computer configuration picture,the communication protocol selection of the upper computer,and the communication protocol design of the lower computer;finally single-and multi-high weak signals detection experiments are conducted through the adaptive SR based on DSP system.The results show that the adaptive SR based on DSP system can detect single-and multi-high weak signals in the same frequency band effectively.The conclusions in this paper can broaden the range of SR applications.