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We investigate how to well utilize radio frequency identification techniques for real-time location systems (RTLS). A new control method, locate tracking tag through reader power control and candidate region intersection (LOCTREC), has been proposed to improve the RTLS estimation accuracy by eliminating trivial tag information from the estimation procedure. Multireaders were deployed and operated...
In order to calculate the RSSI of the virtual reference tags accurately, this paper proposes a method that based on log-distance path loss model. Add some real reference tags in the original layout, read the RSSI of real reference tags twice in a short time interval to calculate the path loss exponent and the average environmental impact value nearby tags by using the model. The virtual reference...
LANDMARC nearest neighbor algorithm of RFID improves the precision positioning and needs to increase the number of the readers and the reference tags, thereby increasing the system cost. Based on the analysis of the nearest neighbor algorithm, an improved algorithm is proposed. The algorithm puts the three readers on the three vertices of the triangle,and three sides of the triangle is as the base...
At present, the LANDMARC algorithm and VIRE (Virtual Reference Elimination) algorithm both use RFID technology in indoor localization. VIRE algorithm is a positioning method by eliminating the virtual tags based on active RFID. Because of the need of expending the gridding and the expandability character of the dynamic netting, the existing methods are not content with the need of the dynamic netting...
Virtual reference elimination algorithm is a method to investigate the location accuracy of location identification based on dynamic active RFID calibration being restricted by the number of reference tags. However, the Received Signal Strength Indicator(RSSI) values of virtual reference tags, achieved from the linear interpolation formula in VIRE, are not enough precise according to the distance-loss...
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