Indoor navigation system based on sub high frequency sound wave

Abstract

In recent years, an on-board navigation system has emerged and gradually met people’s needs for navigation to improve the current congestion of road vehicles, but it’s not easy to be used in underground parking lots, large indoor venues, exhibitions and commercial centers. We use sub high frequency sound wave signals for acoustic communication. The mobile phone communicates with each transmitting device, measures the distance by the TOA ranging method and determines the position by the maximum likelihood estimation method. Once the location is determined, it is displayed in customized indoor map and navigated through the Dijkstra algorithm planning path. Indoor navigation system can suit China’s national conditions and meet people’s daily travel needs.