Design Of Multi Channel Data Acquisition System Based On FPGA

Data acquisition technology has attracted more and more attention, and playing anincressingly important role in national production, military and aerospace fields. Thetemperature of gun barrel has a direct impact on firing accuracy, ammunitionsafety and service life of gun barrel. The need of gun barrel temperature measurement is moreand more strongger.According to the gun barrel temperature measurement, the paper designs a four channeldata acquisition system, which uses FPGA chip of XC3S500E as the controller. It has thefunctions of wireless control, parameter setting, real time data acquisition and transmission.Based on the idea of modular design, the digital system of the data acquisition system isdivided into the control module and data processing module. The control module is combinedof USB controller, UART (asynchronous serial communication) controller, communicationport selection module, parameter setting module, DCM(digital clock manager) module and areset delay module. It has the functions of the parameter setting(four channels of arbitrarychoice, the sampling frequency of1kHz,500Hz,250Hz and125Hz is optional, the gain of1times,2times,5times and10times is optional etc), manual start or stop the dataacquisition process and data transmission. The data processing module includes ADcontroller, SDRAM controller, data encoding module. It completes the function of12bitprecision data acquisition, the largest8M data access.According to the function and performance index, the paper completes the functionverification which are communication, signal acquisition, multi channel choose and dataaccess. The system works very stable and reliable.