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Q. Fu, G. Retscher:
"Integration of a RFID Time-based CoO Positioning with INS Using a Time Data Capture Tool for Verification";
Talk: ION GNSS 2009 Conference, Savannah, Georgia, USA; 2009-09-22 - 2009-09-25; in: "ION GNSS 2009 Conference", (2009), 8 pages.

This paper describes the current research work in the project UCPNAVI (Ubiquitous Carthograpy for Pedestrian Navigation) and outlines the methods and obtained results by using the integration of active Radio Frequency Identification (RFID) and Inertial Navigation Systems (INS) for continuous positioning. The key aim of the work package `Integrated Positioning´ in the project is to investigate a beneficial combination of RFID for absolute positioning and INS for relative positioning.
Commonly, the absolute position is determined from RFID by using the Cell of Origin (CoO) method. This method of positioning, however, is only well-suited for applications where accuracy is not crucial (i.e., in the range of several meters up to 10´s of meters). In our study, two improvements to the RFID CoO method were made. The first one was to set a threshold value in order to make smaller cells. The other improvement was to calculate the mean value of the corresponding measurement time of one or several peaks in signal strength. As a result, the positioning accuracy was improved. This advanced method is the so-called RFID time-based CoO. For verification of the RFID time-based CoO measurements, a "time data capture tool" was developed. The benefit of the proposed approach is demonstrated using an experiment.
Our approach using an integrated RFID cell-based and INS positioning with a time data capture tool is well suitable for continuous position determination of a mobile user in challenging indoor environments.

Project Head Georg Gartner:
Ubiquitäre Kartographie für Fußgängernavigation