Angular Diversity Based Visible Light Positioning

Abstract

Visible Light Positioning (VLP) uses modulated LED luminaries to help locate a receiver inside a building. Indoor positioning is becoming an increasingly important service, and visible light has many advantages over other technologies used in indoor positioning systems (IPS). However existing VLP approaches have major drawbacks in robustness that have hindered their ability to be commercially deployed. This work proposes and demonstrates a new way of using light signals in an indoor localization system, titled Angular Diversity Visible Light Positioning (AD-VLP). AD-VLP uses optics at the transmitter to create a structured overlapping light pattern that can be used for positioning. This method is shown to have several advantages over existing VLP approaches, including increased robustness over intensity based techniques while still using a single element receiver. This work also includes an experimental implementation of the proposed AD-VLP system using existing mobile device technology. The experiments prove that sub-meter accuracy is obtainable, even when the receiver is oriented away from the transmitter.