The Research Of UHF RFID Anti-collision Algorithms Based On FPGA

RFID (Radio Frequency Identification) technology is a non-contact automatic identificationtechnology, which communicates in the form of radio frequency signal for target recognition anddata acceptance. RFID technology develops rapidly at home and abroad, there are many differentkinds of RFID products and is widely used in many field, including industrial automation, businessautomation, transportation control management etc. With the RFID making superior progress, tagscollision problem of RFID system identifying multiple tags becomes one of the key problems whichrestrict the development of the RFID technology. Therefore, the rapid, accurate and effectivecollision problem solution is crucial to the development of RFID technology.In view of above problems, this paper probes tag anti-collision algorithm of the RFID systemfrom the perspectives of theory and practice. Firstly, this paper introduces the basic composition,working principle, standards system of RFID system and other relevant theoretical knowledge.Secondly, this paper emphatically researches two types of tag anti-collision algorithms based on theISO/IEC18000-6standards: the ALOHA-based tag anti-collision algorithm and the binary-based taganti-collision algorithm, respectively introduces four different algorithms of them, including theworking principle, algorithm process, authenticated and validated performance indicators.Thirdly,an improved binary query tree algorithm is put forward on the basis of the traditional QT algorithmwitn detailed introduction, and through the theory validation and simulation, we have proved thatthe improved algorithm is more effective and steady than the traditional QT algorithm. Then, theanti-collision module based on the improved algorithm was designed and simulated usingVerilogHDL hardware description language in the QuartusII9.0development environment. Thesimulation results show that the improved algorithm can effectively identify tags, and therecognition speed can reach268tags per second. Finally, it sums up and analyzes the researchresults and deficiencies of this paper, provides a reference for the further research in the future.