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GPS-free Vehicular Localization System Using Roadside Units with Directional Antennas
Ou Chia-Ho,Wu Bing-Yi,Lin Cai 한국통신학회 2019 Journal of communications and networks Vol.21 No.1
The success of dedicated short-range communications(DSRC) applications depends on an accurate knowledge of the positionsof vehicles within the network. At present, vehicle localizationis generally performed using some form of vehicle-mountedglobal positioning system (GPS). However, GPS signals may not bealways available. Various GPS-free vehicle localization techniquesusing the ranging information, the prior knowledge of the vehicle’sposition, or the special hardware have been proposed for enhancingthe performance of traditional GPS-based methods. Differentfrom the previous approaches, we propose a GPS-free vehicle localizationsystem using roadside units (RSUs) with directional antennaswithout specific hardware support on the vehicle and theassumption of the prior knowledge of the vehicle. In the proposedapproach, each vehicle determines its position using the informationcontained within beacon messages transmitted by neighboringRSUs deployed along the road only. The performance of the proposedlocalization scheme is evaluated by ns-2 simulations and iscompared with those of recent GPS-free and GPS-assisted localizationsystems. The simulation results show that the proposed localizationscheme achieves a higher positioning accuracy than theexisting GPS-free and GPS-assisted schemes. The feasibility of theproposed system for practical applications is further investigatedexperimentally. The experimental results for the positioning accuracyare consistent with those obtained from the ns-2 simulations.
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