Active Rfid Application Systems Design And Anti-collision Algorithm Research

Radio Frequency Identification (RFID) realizes automatic identification of the identified object by using of radio frequency signal coupled (inductive or electromagnetic coupling), or the transmission characteristics of radar reflectivity. Because of its advantages ,which contain no wiring, fast layout, high speed, transmission reliability, low cost and can operate in harsh environments, etc. Radio Frequency Identification technology has been a rapid spread and promotion in the identification, goods identification and data collection fields.This dissertation introduces the basic concepts of RFID, the development process, market outlook, working principle, key technologies and related theories. And one of the key technologies for RFID - anti-collision algorithm analysis, mainly on the ALOHA algorithm depth. The emergence of active tags and the application of RFID technology in the fast-moving objects have the urgent need for a limited time, readers quickly and efficiently identify a large number of tags. Tag anti-collision algorithm is to solve the reader effective communication in the context of multiple tag readers to communicate with both problems. The complexity and cost to maintain a certain condition, minimize search time and improve recognition efficiency, anti-collision algorithm is the label directions and trends.This dissertation presents a program of active RFID applications. Include readers and active tags are designed and a detailed schematic diagram of hardware and software flow chart are given. The program for PIC18F2410 microprocessor core, using a dedicated integrated circuit chips (mainly RF transceiver chip nRF24L01 and ferroelectric memory chips FM31XX, etc.), simplifying the hardware design and lower power consumption. Select the dynamic frame ALOHA algorithm and improved, detail the process of the improved algorithm, and applied to the system, and improve recognition efficiency. Finally, the problems encountered in the design, solutions, and provide some suggestions for future work.