ETH - Indoor Positioning & Indoor Navigation


10:30 - 11:00	Norie Uchitomi, Atsuki Inada (presenting author), Manato Fujimoto, Tomotaka Wada, Kouichi Mutsuura, Hiromi Okada: Accurate Indoor Position Estimation by the Swift-Communication Range Recognition (S-CRR) Method in Passive RFID systems RFID (Radio Frequency IDentification) systems have become meaningful as a new identification source that is applicable in ubiquitous environments. One of the important technologies that use RFID systems is the indoor position estimation of RFID readers. Using conventional methods, the system needs at least two RFID tags for the accurate indoor position estimation, and the accuracy itself of position estimation is not so high. In this paper, we propose a new method for accurate position estimation of passive RFID systems. The proposed method is capable of accurate position estimation in near real time regardless for large numbers of RFID tags.

11:00 - 11:15	Donnacha Daly (presenting author), Thomas Melia and Gerard Baldwin: Concrete Embedded RFID for Way-Point Positioning RFID markers are proving to be a cheap and reliable enabler for indoor positioning in applications such as warehousing, facility management and guidance for the blind. Motivated by this we have developed a low-cost concrete embedded RFID marker technology for robust and long-lasting way-point identification. Embedding passive tags in concrete significantly reduces their read range and hence, usefulness as markers. By appropriate modification of the antenna and packaging of passive tags we have extended hand-held readability to over one meter, a distance previously unachievable for concrete embedded RFID. This paper details the background research and subsequent development of our modified tags, including results from our measurement campaign. Some applications of our technology are also discussed.

11:15 - 11:30	Martijn Kiers (presenting author, at FH-JOANNEUM), Elmar Krajnc, Werner Bischof, Markus Dornhofer: A New Approach for an RFID Indoor Positioning System Without Fixed Coordinates for Visually Impaired and Blind People In the project “Ways4all” passive RFID-tags are used to identify indoor routes, barriers and means of public transport. The basis for this project is the tactile guidance system where passive RFID-tags are placed at strategic spots. Those RFID-tags send their code through an RFID-reader to the user’s mobile phone. The phone sends the code to an RFID-database server where all the tags together with some additional information are saved as location points. For the routing a new navigation software, the so called “Gerwei-Method”, has been developed. Before leaving, the user has to enter his/her destination by which the server with the “Gerwei-Method” calculates the route. The mobile phone receives real-time routing information (including delays and platform changes) from the database. On the phone the routing information will be sent in an acoustic way to the blind person. This way, the blind person gets his/her indoor route instructions from the system.

11:30 - 11:45	Emidio Di Giampaolo: A new paradigm of passive-RFID based localization systems A new localization paradigm based on passive RFID systems with low radiated power is investigated and simple localization algorithms are presented. A theoretical model has been developed and tested by means of numerical and experimental analyses. Our model allows a mobile device with an RFID reader to localize itself with respect to a grid of fixed tags used as reference anchors. Simple localization algorithms based on a proximity technique allow a real-time localization. The localization accuracy can be tuned by varying a set of parameters. Experimental results show both the feasibility and the reliability of the proposed method.

Oral Presentations (Poster Teasers)


11:45 - 11:47	Yingliang Lu (presenting author, at Fujitsu), Yaokai Feng: RFID Tags Localization Using Pattern Matching (Poster Teaser) In this paper, we investigate the use of passive RFID technology for object localization. Because of the limitation of a RFID(Radio Frequency IDentification) reader, using the traditional methods a RFID reader can only localize a tag is or is not in its readable area, but cannot localize the exact position of the specified RFID tag in the readable area of the RFID reader. However, in order to find the trajectory and location of a specified tag, we log the trend graphics (Fig.2) of some tags reading success ratio in advance, then we provides a pattern matching algorithm to track the reading success ratio of the specified tag. At last, the exact position can be localized by the trajectory of the specified tag. In our experimental results, a Fujitsu RFID Reader was used, and the localization was achieved with an accuracy of roughly 10 cm.

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