| Summary: | 碩士 === 義守大學 === 電子工程學系碩士班 === 98 === Radio Frequency Identification (RFID) has been considered as an attractive method for the ubiquitous computing. One area of ubiquitous computing is composed by the location-aware systems, systems where applications are designed to estimate the coordinates of tracking objects in qualified vicinity or in correlation to reference locations. The passive UHF RFID system is an attractive solution for location awareness applications. Passive UHF RFID tags have gained significant popularity due to their low cost, small footprint, ability to function without batteries, faster response rates and longer read ranges as compared to common HF RFID tags.
In this thesis, a location-aware systems based on passive UHF RFID technology is proposed. In UHF RFID system, the role of antennas is very important for transfer power and signal. Therefore, reader antenna is a key important component of RFID system. The design and simulation of a patch antenna with circular polarization is presented. A circularly-polarized antenna can help maximize performance of the location awareness system. In contrast to compute the position of the tracking tag based on each individual reference tag, a cluster localization algorithm is introduced to improve the tracking accuracy. Based on the proposed cluster localization algorithm, the performance of the system was within the reasonable accuracy for 3D location estimation. In addition, the FPGA implementation of law of cosines based on CORDIC algorithm is proposed in order to study the feasibility of enhancing the performance of a location awareness system.
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