| UHF RFID is widely used in industrial production and daily life due to the long identification distance,strong anti-interference capability and fast communication speed with tags.Currently every country is devoted to developing RFID standard suitable to its national condition,while a uniform RFID standard system has not been formed.To meet the rapid development of RFID technology,our country published the 800/900MHz Air-Interference Protocol for IT Radio Frequency Identification on September 18,2013 and started to implement on May 1,2014.In this thesis,a UHF interrogator is designed and developed based on GB/T29768 protocol proposed by our country independently.The main research work includes:1.The functional block diagram,as well as the STM32F103RCT6 controller,serial port,reset circuit,and SPI communication circuit was designed;2.The communication procedure and frame structure of communication between the interrogator and host computer were designed and achieved through code;3.The control function,encryption algorithm,typical communication procedure,and the whole system flowchart were designed,and the control program was achieved through code;4.The signal of communication process between the interrogator and tag was captured by the conformance testing system.The data and message of Query,ACK,Read signals were analyzed in detail and found to completely meet the requirement of the protocol.The radio frequency power of the interrogator is between 10 dBm and 30dBm,and can be step-by-step controlled by 1 dB.The effective identification distance of the interrogator is beyond 9 m when connected to 7 dBi gain ceramic antenna.The anti-interference performance of the interrogator is 120 per second. |
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