关键词: 射频识别, 室内定位, 扩散方程

Abstract: The accuracy of location decreases seriously due to increasing of ranging errors when the Monte Carlo location algorithm is used to keep track of tag in Radio Frequency Identification（RFID） indoor location system. In this paper, the diffusion function is introduced into the Monte Carlo location algorithm, in order to research the relation between the accuracy of location and ranging error. Simulation results show that the accuracy of location is influenced not only by the value of ranging error, but also by the direction of tag’s movement. For the same ranging error, the location is most accurate, when the direction of tag’s movement is perpendicular or parallel to the line from tag to reader.

Key words: Radio Frequency Identification（RFID）, indoor location, diffusion function