Research And Application Design For Radio Frequency Identification Technology

RFID(Radio Frequency Identification) is a kind of technology which aim to achieve the target identification and exchange data .This technology use radio frequency to achive non-contact two-way data transmission between tags and readers.The radio frequency identification technology is fast popularized in many services, the freight distribution ,the rear service , the production enterprise and the material current, which greatly facilitated the management of the people and substance, and also make information gathering and the statistics convenient and enormously enhanced the production efficiency and facilitated people's daily life. RFID-based research and application of electronic tagging technology has a broad rang of development.The main tasks of this paper include the following parts.1. Analysis of RFID communications mechanism, system structure, process, key technology, and so on.2. Introduction for the RFID technology in key anti-collision algorithm and the theory of popular anti-collision algorithm.3. Paper designed remote active RFID systems. The system uses the Nordic's nRF24L01 chip as a sytem of RF transceiver, working in the 2.4 to 2.5 GHz the global open ISM band, rating of 0 to 2Mbps, the maximum emission power 0 dBm. Tags and readers were using different MSP430 chips as their main controller.4. Aanlysis of the projects in the anti-collision. The binery search algorithm requires Manchester codeing devices,but nRF24L01 using GFSK coding,so project adopte ALOHA algorithm. According to ALOHA algorithm and slot ALOHA algorithm, the article do simulation in the case of performance parameters of different sizes. Simulation results show that:(1) Slot ALOHA algorithm both in the number of re-issued and on the system delay has significantly improved for ALOHA algorithm.(2) For any of the algorithm, a logical choice backoff interval is needed. If backoff is too big, when the number of tag is little the system delay would be too large. If backoff interval is too little, when the number of tag is large sytem delay would be too large. Backoff interval should be choice according to the requirements of sytem performance.5.0n IAR'S EW430 development environment, paper develops embedded software. Embedded software implemente basic functions of the project.