Studyand Design Of Multiple Tags RFID System With High Throughput And High Real-time Performance

RFID(Radio Frequency Identification,RFID)technology raised from the 1990 s,and has gradually became an mature automatic Identification technology,it use radio frequency signal on non-contact two-way communication,to achieve the goal of target recognition and data exchange.The RFID system is mainly composed of three parts: tags,reader and information processing system.In practice,whenmultiple tags are inthe scope of the role of thereader,tags information will araise collision.This requires that the RFID system must support an anticollision algorithm can solve the problem of collision,the reader can quickly and accurately identify multiple tags at the same time.Due to the anticollision algorithm for RFID systems of high throughput and high real-time requirement,this paper studies the RFID communication standard of ISO/IEC14443 and ISO/IEC15693 anticollision algorithm,and focused on an improved anticollision algorithm,and on the basis of the improved algorithm,designed multiple tags RFID system with high throughput and high real-time performance.In this paper,the main work can be summarized as follows:(1)In this paper,animproved multiple tags anticollision algorithm is proposed,this algorithm is applicable to meet ISO/IEC15963 RFID tag system.In the presence of dynamic change of the tags set case,according to ISO/IEC15693 protocol algorithm of collision free slot and collision slot too many shortcomings,this paper puts forward the improved algorithm,the improved algorithm can complete to identify dynamic tags set,with high real-time performance and has high recognition efficiency.(2)The MSP430 microcontroller and multi-protocol TRF7969 A RF interface chip as the core hardware,design of high throughput real-time tags RFID system.System hardware part and software part,with MSP430 single chip microcomputer as the core,the hardware part control TRF7969 part performs the improved tags anticollsion algorithm,improve the system performance in multiple tags identification,as well as the system software part.(3)The designed multiple tags RFID system was tested,the basic function of RFID system and algorithm of anticollision are testing to prove: RFID reader can communicate with more than RFID tags at the same time,compatible with ISO/IEC14443 and ISO/IEC15693 protocol standard,were demonstrated by comparing the improved anticollision algorithm has certain application value.System validation showed that the improved anticollision algorithm,compared with ISO/IEC15693 standard original collision algorithm throughput increased by 11.7%.The identification efficiency of the hardware systemis 68.2 ms/tag,the largest recognition distance is 13 cm,at the same time identify most ISO/IEC15693 17 tags.The designed system has reached the intended target,the label the presence of dynamic changes are still identify throughput,applicable to the production of RFID solutions.