Research Of Identity Recognition System Based On RFID

Radio frequency identification technology,a kind of non-contact automatic identification technology,is regarded as one of the core technology to support the development of the Internet.The tag that carries information is read and exchanged through the wireless transmission of radio frequency signals in order to achieve the goods can be rapidly and accurately identified.Radio frequency identification information has been widely used in various fields of security,transportation,logistics,medical etc,and the application mode has been developed more and more mature.But the technology popularization and promotion is affected by the problem of anti-collision and recognition efficiency.Focusing on the anti-collision algorithm of RFID identification system is studied in this paper.The three classical algorithms are analyzed and compare."Starve to death" problem is caused by overlapping time points of the tag in the ALOHA algorithm.Long time delay recognition phenomenon is caused and the performance of the system is affected by the length and the distribution of the identifier in the binary tree algorithm.The disadvantages can be effectively avoided by improving the above algorithm in the FSA-QT anti-collision algorithm.The throughput of FSA-QT algorithm is the highest and remain at more than 50% by MATLAB simulation.But the label mostly in non static environment,the loss of the tag is a serious problem in the actual application process.Based on the FSA-QT anti-collision algorithm and stack theory,FSA-QT algorithm and modeling in mobile environment is introduced.By comparing the tag loss rate of the two algorithms affected by the frame length,the conclusion is obtained that when the frame length is less than 256 slots,the tag loss rate of mobile algorithm is 12% lower than the FSA-QT algorithm.When the label sojourn time is greater than 450 slots and the number of tags is less than 30 tags,the tag loss rate of mobile algorithm is close to 0,but the tag loss rate of the FSA-QT algorithm is close to 10%.Mobile FSA-QT algorithm greatly reducing the loss rate of the tag is obtained by analysing the simulation and comparison of sojourn time changes,tag density changes,labels arrive rate,cycle time length,frame length variation and stability of the algorithm five aspects.Finally,the RFID system based on GB/T28925-2012 protocol is designed and the reader of RFID system is mainly studied.Encoding,decoding and anti-collision algorithm of the digital baseband part in the reader are simulated by hardware timing waveform using the MODELSIM simulation platform.The system has been validated that the tag can be effectively identified.