Uma Solução Cooperative Positioning Integrada com Dead Reckoning para Suporte a GPS Sem Linhas de Visada Utilizando a Tecnologia de Radio 802.11p
Abstract
In Intelligent Transportation Systems (ITS) and Vehicular Networks (VANETs), a myriad of applications has been developed in the last years with different requirements of location accuracy. The vast majority of such applications use the Global Positioning System (GPS) to obtain the device’s current location. However, in the absence of a satellite line-of-sight, a typical situation in places such as tunnels, multilevel highways and dense urban areas, the GPS signal is exposed to multipath effect, causing severe loss of location information in the receiver. In this paper, we characterize the problem of GPS unavailability in urban areas from datasets of movements of buses and taxis. To solve such a problem, we propose CP – an integrated solution for Cooperative Positioning based on three mechanisms: Dead Reckoning-based navigation; dissemination of location in VANET and node selection by Geometric Dilution of Precision; and map adjustment.
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