Abstract
In this study, link control technique using multiple photo detectors is introduced to avoid disconnection of the optical wireless link for optical telemetry. At the mobile terminal, link control is executed by direction detection of a base station evaluating received signal intensities of photo detectors which have orthogonal directions of sensitivity (fig.1 (a)) and radiating the uplink signal to the base station. We evaluated the effectiveness of the link control technique using the experimental system (fig.1 (b)). As the results, the effectiveness of proposed technique were confirmed within the transmitting area covered by 7 meter radius from the base station.
