Distributed Data Synchronous Acquisition System Design And Implementation

With the rapid development of distributed data synchronization acquisition technology, distributed data synchronous acquisition system has been widely used. The data synchronization acquisition technology of distributed data synchronous acquisition system and real-time processing technology plays an increasingly important role in data acquisition system. Distributed data synchronous acquisition system most important requirement is to improve the synchronization of the data collection and data acquisition accuracy.To achieve high-precision synchronous data acquisition and processing of real-time requirements for distributed data synchronous acquisition system, the design of a chip AD9548direct use DPLL locking GPS second pulse to complete the synchronization signal synthesis, to synchronize data acquisition program. And the design and implementation of a clock synchronization module, data acquisition module and data processing module synchronous data acquisition system.This thesis discusses the basic theory and features of the clock synchronization technology and digital phase locked loop technology; through the summary and analysis of the existing typical clock synchronization scheme, analysis the theory and characteristics of GPS clock synchronization technology, IRIG B code clock synchronization technology, the NTP clock synchronization technology, hard pulse synchronization technology and serial packet synchronization technology; Then based on the existing clock synchronization technology, gives the system designof the clock synchronization scheme; the hardware and the software design of each module of the distributed data acquisition system, the system is composed of five modules, namely, power supply module, clock synchronization module, signal acquisition module, FPGA logic control module, and OMAPL138signal processing module. Clock synchronization module uses Ublox’s GPS module LEA-5S and ADI’s AD9548chip to achieve clock synchronization. Data acquisition and control circuitry to Xilinx’s field-programmable gate array device XC3S1600E as the core, extends the AD acquisition module, GPS information decoding module, Interface module and DA output module. Operation section to TTs OMAPL138chip as the core is responsible for collecting the data in real-time processing, Finally, several tests and analyses have been conducted on the distributed data synchronous acquisition system realized through a distributed data synchronization acquisition scheme proposed in this thesis.