Real Time Location Tool for Precision Tracking of Passive UHF RFID Tags in Two Dimensions

Download or read book Real Time Location Tool for Precision Tracking of Passive UHF RFID Tags in Two Dimensions written by Nasir Kenarangui and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis considers a precise RTLS (Real Time Location System) implemented with a Passive UHF RFID system. Software is created to interact with an RFID reader to collect the tag's backscatter power in terms of the RSSI (Received Signal Strength Indicator), as well as read the tag's ID. The software also reads from a web camera, and locates the tags within the camera's point of view by using only the RSSI of the tag. It is capable of computing the locations of tags by locking on each tag's unique EPC, and marking their location and corresponding tag ID on the screen. By comparing the tag on the screen, with the marker of the calculated location, the accuracy of this system is established. The calculations involve a simplified path loss model which computes the tag's distance from the reader antennas, followed by a multilateration calculation which locates the tag on a two dimensional plane in front of the web camera. To compensate for environmental factors, the software first performs a calibration to map the environment using numerous calibration tags with known locations. The result of this work is a tool which can be used to identify, locate and track tags in real time, and also to analyze the environment and perform RFID localization in general.