On GPS Fault-Tolerance for City-Bus Tracking System using Wireless Sensor Networks
Aug 01, 2016
Published in: International Journal of Networks and Communications
Publisher: scientific and academic publishing
In modern crowded cities, public transportation is one of primary ways for people to go to work, shopping, etc. Therefore, it is necessary to provide an application which estimates buses’ real-time current location, supported by Google map application which displays bus location and expected arrival time. In this work, we propose a city-bus tracking system which contains two localization methods: First, using GPS method. Second, a fault-tolerance method using Wireless Sensor Networks (WSNs), in case of GPS signal failure, e.g.; due to weather conditions or physical obstacles. In this method, wireless sensor boards are deployed in selected locations along buses routes in city, and each bus is equipped by a wireless sensor board and GPS. When GPS signal is bad, the second method is considered, where bus-sensor node sends a “Hello” packet, while bus moving, to nodes deployed over bus route. Based on the Received Signal Strength Indicator (RSSI) and number of route nodes which received the “Hello” packet, the proposed localization method is used to estimate bus location.