Research On Anti-collision Technology Based On RFID System

Radio frequency identification technology is an emerging technology of non-contact identification,which has the advantages of fast identification speed,strong anti-interference ability and large amount of stored information.This technology is widely involved in various fields,such as warehouse logistics,transportation,and intelligent manufacturing.It has improved the level of intelligent management in these fields and promoted the pace of the Internet of Things era.However,RFID technology also has some continuous problems in practical applications,and the problem of multi-tag information collision is one of them.In the RFID system,the channel used for communication between the reader and the tag is the same.When multiple tags respond to a reader at the same time,the problem of tag conflict may occur,causing the tag information cannot be read by the reader.Therefore,how to effectively solve the problem of tag collision is of great significance to the research of RFID technology.This thesis focuses on RFID anti-collision technology,the improvement of tag anti-collision algorithm and the application of RFID in warehouse management system,etc.,and launches the following research:(1)This article introduces the four major types of RFID system composition,working principle and RFID system anti-collision technology.At the same time,the article conducts simulation experiments on the binary algorithm and Aloha algorithm in the time division multiple access anti-collision technology.Analyze the advantages and disadvantages of various algorithms through experimental results to start the research work of this article.(2)In order to solve the problem of uneven slot allocation in the dynamic frame slot Aloha algorithm,a grouped dynamic frame slot Aloha algorithm(GC-DFSA)based on hybrid chaotic system is proposed.The algorithm uses a hybrid chaotic system,which includes the combination of Tent mapping and multiplicative congruence method as the first chaotic system,and the combination of Tent mapping and one-dimensional wireless folding map as the second chaotic system.In the traditional packet dynamic frame slotalgorithm(G-DFSA),the pseudo-random number generator is replaced with a hybrid chaotic system to form a new type of anti-collision algorithm(GC-DFSA).The improved algorithm makes the time slot allocation of the label more uniform in a frame,thereby reducing the number of idle time slots and improving the efficiency of label recognition.Experimental results show that the improved GC-DFSA algorithm is superior to the GT-DFSA and G-DFSA algorithms in total slot consumption,and throughput rate(3)In this paper,in view of the problems of improper parameter adjustment and large time slot waste in the traditional Q-value algorithm,a two-parameter local deterministic algorithm based on Q value is proposed.In the Q-value algorithm,dual parameters are introduced to dynamically adjust the Q value.When a collision or idle time slot occurs in the detection bit,different adjustment parameters are used to adjust the Q value.In addition,a collision analysis mechanism is added to the collision position of the tags,so that the collided tags still have the possibility of being recognized again in the current frame.Experimental results show that the improved Q-value anti-collision algorithm has the best throughput rate compared with the Low bound algorithm,FSA algorithm and traditional Q-value algorithm when the same number of tags are recognized.When the number of labels to be recognized increases,the throughput of the improved Q-value anti-collision algorithm can basically maintain the optimal state.And to identify the same number of tags,the improved Q-value anti-collision algorithm consumes the least number of total time slots.As the number of tags to be identified increases,the advantage of changing the Q-value algorithm is more obvious.(4)Aiming at the problems of cumbersome processes and error-prone information in traditional warehouse management,an RFID-based warehouse management scheme is proposed.This scheme has designed an overall system architecture,using the MySQL database to describe the logical structure and physical structure of the system in detail,and implemented the host computer system design through Java7.