Design And Implementation Of Long-distance Multi-node Optical Fiber Transmission System Based On FPGA

The traditional method of collecting data from pipeline inspection is inefficient and has poor real-time performance,which can not meet the development needs of today's oil pipeline transportation.In order to meet the requirements of real-time monitoring of pipeline status and realize the intelligent data acquisition of multi-monitoring nodes in oil pipeline,this thesis designs and implements a multi-node data acquisition and transmission system based on FPGA and optical fiber communication technology.This system can complete the automatic and real-time acquisition and transmission of the data of the multi-monitoring node of the pipeline,and overcomes the shortcomings of the traditional data acquisition mode,which greatly reduces the cost of monitoring and has certain practical value.The main work of this thesis is:1.This thesis introduces the research background,the significance of the research and the development of the remote monitoring system at local and overseas.The technology and characteristics of the existing multi-node data acquisition and transmission system are analyzed and discussed.2.The overall design of the system.The thesis analyzes the data communication methods,system working principle and master chip of the system design,and determines the specific design scheme of optical fiber communication,node series mode and using FPGA as the main control chip.3.System hardware design.According to the functional requirements of the system,the system hardware circuit is designed in detail,and the schematic design and PCB design of the system power circuit,FPGA configuration circuit,FPGA clock circuit,communication status indication,external memory circuit and photoelectric conversion circuit are completed.And finally system hardware circuit board was developed.4.System FPGA software design.According to the system software function requirements to determine the FPGA software system framework,in the Quartus ?software,using the top-down design method and Verilog HDL language FPGA programming design,to achieve clock frequency,communication protocol,data serial and parallel conversion as well as external RAM read and write functions,completed the FPGA software in the upper input data receiving cache module,the node data source to receive the cache module and the level of data output module design.5.System function testing and analysis.After the hardware circuit board is made,the hardware circuit module is tested,and the Testbench software function module is simulated by Modelsim simulation software.Finally,a multi-node system is built,the function of the system is tested,and the test results are analyzed.