Design Of Weak Signal Acquisition Card Based On ARM

The purpose of weak signal detection is to extract useful signal from intensive environmental noises. And some advanced technology or new methods are used to improve signal-to-noise ratio of detection system. The traditional theories of weak signal detection were to improve signal-to-noise ratio based on inhibiting noise. In this paper stochastic resonance theory is presented to increase signal-to-noise ratio. So the detection of weak signal is realized.Dual coupling Duffing chaotic oscillator based on single Duffing chaotic oscillator is used. The stability of weak signal detection is better than sing Duffing chaotic oscillator through MATLAB simulation.The front terminal signal modulated circuit is designed based on the principle and performance index of weak signal detection. Meanwhile programmable amplifier is used to regulate amplification and integrative performance is promoted.The paper presents a new data-acquisition system based on USB interface which uses Samsung microprocessor of S3C4510B. The system has the feature of PnP (plug and play).The online acquisition and real-time transmission of data-acquisition system is realized.The system applications program based on Labview software of NI Company is designed.The correct connecting and communication of upper machine and lower machine is realized through establishing and calling of dynamic link library (DLL). Based on the designed hardware platform and programme design of data-acquisition system, the corresponding waveform is detected from niose with correlation arithmetic.