| Radio Frequency IDentification (RFID) is a kind of automatic identification technology which completes the identification through the data storing and remote accessing. The standards and applications of RFID technology at both the low frequency and high frequency are already quite mature, and the Ultra-High Frequency (UHF) RFID technology becomes a focus and hot issue in this field, with the appearance of the ISO/IEC18000-6C protocol. Therefore, the research and design of the UHF RFID handheld is of great significance both in theory and in practice.The main purpose of this dissertation is to design a UHF RFID handset which can quickly identify the multi-tag and meets the ISO/IEC18000-6C protocol based on ARM7 embedded development platform. Main contents of this paper are as follows:(1) Introduction of the basic theory and development history of RFID;(2) Detailed illustration of the design process of the RF-channel module, including the hardware implementation and the low-level driver design by adopting two general radio-frequency chips CC1100;(3) Description of the hardware design of a UHF RFID handset which employs ARM processor as its core;(4) Analysis of the core of ISO/IEC18000-6C protocol and description on the design process of the Pulse-Interval Encoding (PIE) operation and Bi-Phase Space (FM0) decoding operation as well as the label operation such as identify, read, write, lock and kill;(5) Analysis of the relationship between the efficiency of the system and tag numbers, and presentation of the Q-Algorithm algorithm to avoid the data transmission collision in RFID system by using the forecasting models of tag number and the sampling theorem;(6) Description of the debug and improvement of the development system as well as the transplant of theμClinux operating system to it.After repeated tests, the UHF RFID handset can identify a single tag and the capture distance is up to 5 meters. Meanwhile, simulation results under the multi-tag mode are presented using Matlab. |
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