Research On RFID Anti-collision Algorithm Based On The Electronic Tag

Radio frequency identification (RFID) is the use of radio frequency identification technology through the electromagnetic coupling means to accomplish non-contact automatic identification in order to achieve data information exchange and communication. Radio frequency identification technology in Internet of Things has been widely used. It has been rapidly popularized especially in the field of production, medical,logistics,tracking,transportation,security,equipment or asset management and has optimized the electronic commerce, logistics management, information collection and data processing, greatly improving the production efficiency. People have never left home and have been met daily requirement.The research and application about the electronic label technology which base on radio frequency identification technology has a good development prospect.In the RFID technology, collision algorithm is not only the core content of the RFID system, but also is one of the key technologies in the RFID system. How to accurately and rapidly identify tags directly affect the enterprise production efficiency and cost. In order to improve the recognition efficiency and solve collision recognition problem in the RFID system. Through analyzing and researching protocol and anti-collision algorithm in depth, it puts forward an improved anti-collision algorithm, it has definite significance in practice and theory. Main research work and i nnovati on poi nts i n thi s paper are I i sted as f ol I ow.IThe paper firstly analyzes composition and working principle for radio frequency identification system. On condition that in the light of the collision environment when multiple tags identify, according to the different frequency band system and protocol standard, three kinds of present man collision algorithm research have been analyzed. Besides, the ISO18000and ISO15693standard protocol have been analyzed in detail.2. The paper based on study of the framed slotted ALOHA anti-collision algorithm found that the methods of optimizing time slot are generally taken.But this method cannot shorten the recognition time, and need more additional memory to store large amounts of data search list, so as to improve the production cost. So this paper puts forward a kind of anti-collision algorithm based on time optimization. Firstly.the time throughput is defined and probability of success slot, free slot, collision slot are calculated by means of principle of binomial distribution.Secondly, the partial derivative of differential equation is calculated, and then the partial derivative equation is transformed by omega function. A mathematical expression is constructed which describes optimal frame size when identification time is a minimum in the identification process through analyzing throughput of identification time, the estimation value of tag number is reasonably chosen according to the decision factor. The improved anti-collision algorithm efficiently decrease collision slots and balance distribution number of slots by means of time needed for the collision slot about three times more than that needed for free slot, reducing the identification time in the entire identification process. The theory and simulation show that the improved anti-collision algorithm efficiently shorten the identification delay time and enhance the identification efficiency. With previous three kinds of algorithm in two different RFID standard for comparison, total identification time and collision slot number is less than the other algorithms.3.According to the goal and function of design platform for RFID system,system has been verified and test under actual hardware environment. First of all, RF module is chosen, and the function of each module structure are analyzed in detail. At last, the design scheme in the close and distant field for RF system have been presented. The Program finish debug under IAR Embedded Workbench integrated development environment, and then downloading to MCU chip through the MSPFET simulator. The results show that this scheme comply with the design requirements.