The Design Of High Speed UHF RFID Digital Transmission System

Radio frequency identification(Radio Frequency Identification,RFID)technology is a non-contact automatic recognition wireless communication technology that uses radio frequency signals to recognize and exchange relevant data for specific targets.According to the different operating frequency of electronic tags,RFID technology can be divided into low-frequency,high-frequency,ultra-high frequency,microwave and other systems with different operating frequencies.The electronic tags of low-frequency systems mainly operate in the frequency bands of 125 kHz,133 kHz and 134.2 kHz.The electronic tags of high-frequency systems mainly operate in the frequency bands of 13.56 MHz.The tags of low-frequency and high-frequency systems communicate by inductively coupled mode,which can effectively identify in short distance with slow transmission rate,and it is mainly used in short distance and low cost applications.Ultra-high frequency electronic tags mainly operate in the frequency bands of 433.05 MHz to 434.79 MHz and 860 MHz to 960 MHz.The electronic tags of microwave systems operate in frequency bands of 2.45 GHz and 5.8 GHz,The tag of UHF and microwave systems use electromagnetic backscatter coupling mode to exchange data,which can effectively identify distance,so it is very suitable for high-speed,long-distance and multi target RFID system applications.The high-speed digital data transmission system based on UHF RFID technology designed and implemented in this paper combines UHF RFID and wireless high-speed long-distance data transmission technology.It is compatible with the characteristics of object recognition and high-speed data transmission and can be used for high-speed sensor information wireless transmission.In this design,It uses R2000 chip-based base station(according to ISO/IEC 18000-6C protocol)and acquisition terminal,combined with the corresponding base station software developed by the host computer,to achieve a set of VGA image data acquisition,storage,transmission and recovery in one highspeed data transmission system.The high-speed UHF RFID digital data transmission system consists of an acquisition terminal and a base station.The design of the acquisition terminal consists of a baseband processing module based on the ZYNQ7020 and a VGA image acquisition module based on the AD9883 A.Under the control of the host computer software,In addition to meeting the inventory and read/write operation functions of the ISO/IEC 18000-6C protocol,The system’s acquisition terminal can also obtain the data of VGA signals from devices such as computers or workstations and stored in the FLASH of the acquisition terminal,and transmit the image data to the reader of the base station through the air interface when needed,Then the host computer program of the system can process and recover the captured image.And the wireless communication transmission distance of the system designed in this paper can reach 21 m.The design of high-speed UHF RFID digital transmission system will demonstrate that high-speed long-distance data transmission technology based on UHF RFID is feasible,at the same time,It will greatly extend the functionality of UHF RFID system and application scope and fully meet the important equipment for military and civilian field distance recognition and the application requirement of data acquisition,The system designed in this paper can also significantly improve the efficiency of management of the important assets and equipment.