Passive Localization with Visible Light

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Abstract

Indoor localization is a topic of significant interest for academic and in dustrial. For outdoors, we have Global Positioning System (GPS) working very well, but GPS does not work indoors and we spend more than 90% of the time indoors. Thus, there is a great need to find solution for this prob lem. Many technologies have been proposed for indoor localization based on radio frequency, infrared and ultrasonic sensors. Recently, researchers have been using light as a means to achieve indoor localization. LED lights inside our buildings can transmit information and they can be seen as “internal GPS satellites” playing the role of localization anchors. But most of these works require the user to have an electronic device. In this thesis, we would like to achieve indoor localization with visible light but in a passive manner. By passive, we mean that the object of interest would have no electronic device or tag. This thesis takes the first step in developing such a system and our contributions are three-fold: we develop a system and a mathematical model to analyze it, we show a scaled-down application in the order of decimeters and we also show a more realistic application in the order of meters. Our work shows that this is a promising way to achieve accurate indoor localization in a passive manner.