Map-based positioning using mobile phones
Ramm, Katrin, Renate Czommer and Volker Schwieger
The acquisition of road users to influence the traffic flow is known under the name of Floating Car Dataa and different services are offered on the market. Probably because of the high communication costs the GPS position has to be sent to a centre via the mobile telephone system the availability for an area-wide acquisition of traffic data is low and could not win recognition on the market yet. In the project Do-iT (Data Optimisation for Integrated Telematics) with grant of the BMWi (Federal Ministry of Economics and Technology) the possibility is investigated to carry out positioning with the use of the existing infrastructure of the mobile telephone system, so that the acquisition of traffic flow is enabled without additional communication costs even apart from motor-ways ((Floating Phone Dataa). High potential is given through the fact that almost everyone has a mobile phone and the high availability in downtown areas. However, the positioning accuracy is reduced in comparison to GPS. In this paper the authors present first results for positioning within the GSM network and matching to a digital map for assessing the road network. The measures used are timing advance value and signal strengths. The results and difficulties occurred are analysed and potential for further improvement is pointed out.
Event: XXIII International FIG Congress : Shaping the change
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