Design And Implementation Of Data Acquisition And Remote Transmission System Based On UHF RFID And Spread Spectrum Communication Technology

The Internet of things technology,regarded as the third information technology revolution after computer and Internet,has been developing rapidly in recent years,and has grown into a strategic emerging industry of new economic growth point.Data acquisition and transmission occupies an important position in the Internet of things system.With the wide application of the Internet of things in Intelligent Building,Logistics Management,Intelligent Transportation System,Intelligent Agriculture and Industry,Smart Grid,Smart Home,Wise Information Technology of 120 and other industries,there are more and more demands for data acquisition and transmission.The electromagnetic parameters of the work environment are also increasingly complicated and changeable.Therefore,the research and design of data acquisition and transmission system that has wide application in the Internet of things and has excellent anti-noise performance is of great significance.RFID(radio frequency identification)technology is the key technology of the Internet of things system,and it plays an important role in the perception layer of the Internet of things system.It can meet the demands of data acquisition in many industries.LoRa spread spectrum communication technology can not only solve the contradiction of wireless communication between long distance and low power,but also has strong ability to resist noise interference,so it can perform data transmission well.Therefore,the overall design of data acquisition based on UHF RFID and data transmission based on LoRa spread spectrum communication is adopted.In this thesis,the development process of the system is completed from hardware design and software implementation.Firstly,s5pv210,a high-performance processor with the kernel of ARM cortex-a8,was selected as the main control chip of the system,and the software development platform for embedded Linux system is built.Then the circuit schematic diagram and PCB of the two parts of data acquisition and data transmission are drawn,and the working principle of the hardware circuit is analyzed in detail.Besides,the system driver is designed and the point to point communication is realized after analyzing the communication protocol of UHF RFID and the principle of data transmission of LoRa spread spectrum communication.On the basis of the star network topology,the network protocol of the system is designed,and a small scale network testing is carried out.At last,the key metrics such as data acquisition distance,data transmission distance,packet loss rate,bandwidth,transmission power and so on are tested.The test results show that the system is stable and can reliably complete data acquisition and wireless transmission function,and achieves long distance data transmission with low transmitting power,and has the advantages of simple and flexible networking mode.It achieves the anticipated effects and can meet the demands of the system in practical work.