A versatile indoor/outdoor pedestrian guidance system with good mobility is necessary in
order to aid visually impaired pedestrians in indoor and outdoor environments. In this paper,
distance estimation methods for portable wireless localization systems are verified. Two
systems of a fixed active beacon and a receiver using an ultrasound time-of-flight method
and a differential infrared intensity method are proposed. The infrared localization system
was appropriate for the goal of this study. It was possible to use the infrared intensity method …