Indoor Relative Positioning Scheme Using Illuminance and Color Temperature

As schemes for indoor positioning of persons and objects using near field communication and/or visible light communication come closer to reality, expectations are centering on the spread of indoor location-based services. A problem with these schemes is that they are costly because special equipment is often required for transmission and reception. As relative positioning schemes by controlling illuminance and color temperature of existing indoor lighting, this study proposes those using luminance and color temperature. Relative positioning schemes using luminance and color temperature rapidly estimate a relative position by switching multiple lighting patterns of a ceiling lighting system. By gradually adjusting luminance and color temperature for different locations, positioning is possible on the basis of the degree of change in sensed values. We implemented this relative positioning scheme using luminance and color temperature and evaluated the relation between the Euclidean distance and the real distance between sensors in a real space simulating an office. As a result, it was clarified that there was a correlation between the Euclidean distance and the real distances between sensors in 5 stages.