We tested the use for vehicle positioning of a low-cost and low-consumption 802.15.4 WSN, based on the ZigBee specification. The approach allows for positioning vehicles with sufficient accuracy, using appropriate algorithms, distribution schemes and steps. A Least Squares algorithm with appropriate cut-off of potentially disruptive sensors (because of high distance and feeble signal) gives good results, without need to use a generalised least squares method. The positioning accuracies are comparable with those of GPS, and the system can be used where the GPS cannot (canyons, tunnels, etc.). Some results obtained for indoor environments by Goldoni (2010) are also confirmed for the outdoor one; a cost-effective step for the distribution of the sensors is 20 m. Such a step is able to minimise disturbance induced by a noisy received signal strength intensity. Interestingly, the solution proposed entails a low power consumption and a low cost. Assuming that the investment cost is 30 euro per anchor point, the selected distribution step ensures that an infrastructure can be equipped at a cost of 1500 euro/km, which is a reasonable investment cost.
Exploiting vehicle communication with infrastructures for accurate positioning
2013
10 Seiten, Bilder, Tabellen, 8 Quellen
Aufsatz (Konferenz)
Englisch
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