Distribution Of Signal Synchronous Acquisition And Delivery System Research

With the fast development of digital technology, data acquisition is very application moreand more extensive. We advance more stringent requirements on data acquisition, especially insome scientific research and important engineering tests, data acquisition object is not one or afew, but distributed in a range of more than collection of objects according to certainrequirements; each the acquisition of the object is not random, but the precision requirementssynchronous acquisition. For example, in order to research the characteristics of the particularwave, we need synchronous acquisition temperature, pressure, wind speed, the light radiation ina direction of propagation or in a dissemination interface, and will be real-time, automaticallysend the results to the data processing center. For this need, we propose a distribution of signalsynchronous acquisition and delivery system.The system is achieved synchronous data acquisition of each acquisition node by1PPSsignal and time-code in information of GPS reveiver.The paper generally introduces thestructure and working principle of the distribution of synchronous acquisition and deliverysystem. The system includes four components the host computer, the transferstation(ARM),Zigbee and acquisition node which were described. It discusses the acquisitionnode hardware design and working principle. Include the selection of the channel acquisition,acquisition rates, the control of the acquisition time and standing, the circuit design withinCPLD technology, the A/D converter circuit design, GPS time synchronization principle andprocess. It realzes the Zigbee wireless transmission and the master station modulesfunctions.The paper designs the software of the system, includes Linux software platform build,the cross-debugging and transplantation of the Linux operating system, MCU and CPLDprogramme design, Linux-based operating system application programme.Finally,it gives the result of the research and the data of experiment.The testing of thesystem shows that the acquisition node synchronization of data acquisition accuracy is less than100ns,collection data can be correctly transmitted and displayed on the host computer.System isrunning stable and reliable,achieve the expected goal.