PPos-Taxi - efficient allocation of taxis based on precise vehicle positioning

01.02.2007 - 30.08.2008
Forschungsförderungsprojekt
The project PPos-Taxi represents an innovative contribution to an efficient allocation of taxis based on precise vehicle positioning. The booking office of Taxi 31300 plans to use the GPS positions, which are sent to the central office continuously, to automate the allocation of the taxis to the costumers. Therefore the exact position of the taxi must be known for a correct calculation of the arrival time at the costumer¿s place. Due to the currently achieved GPS positioning accuracy of 10 ¿ 15 m it is not possible to identify the driving lane and direction on bridges or highways. This can result in not calculable waiting times for the customer. The aim of the project is to provide a positioning accuracy of the taxis of approx. 2m. This will be achieved by two different approaches: 1.using EGNOS-corrections via internet: In urban areas the EGNOS satellites are not visible due to the obstructions by buildings etc., so the raw GPS positions, sent to the central office by the taxis, must be corrected in the booking office in near real-time. Additionally, some taxis will directly try to receive EGNOS-corrections from the geostationary satellites to provide test data for a comparison of the availability and the accuracy reached. 2.using correction data of a permanent GPS-station (DGPS): Here the raw GPS position of the taxi is also corrected in the central office, using corrections of the WEP (Wienstrom Echtzeit Positionierung). A positioning accuracy of the taxis of 1-2m is desired. Additionally, the independent problem of multipath effects will be reduced by analysis of the signal-noise-ratio of the GPS-signals. The disturbed signal, which has a time delay due to reflections on buildings, trees etc, can so be identified and removed, and the calculation of the position can be repeated. The aim of the project is to realize both solution strategies (EGNOS and DGPS) presented above and to test them regarding accuracy, availability, economic efficiency and operator convenience. At the end of the project Taxi 31300 has the opportunity to choose the most efficient service before upgrading the 800 vehicles in their fleet. The approach chosen can of course be used in general for fleet management in urban areas.

Personen

Projektleiter_in

Projektmitarbeiter_innen

Institut

Grant funds

  • FFG - Österr. Forschungsförderungs- gesellschaft mbH (National) Austrian Research Promotion Agency (FFG)

Forschungsschwerpunkte

  • Sustainable and Low Emission Mobility: 60%
  • Environmental Monitoring and Climate Adaptation: 40%

Schlagwörter

DeutschEnglisch
NavigationNavigation
GPSGPS
EGNOSEGNOS
präzise Positionierungprecise positioning
Flottenmanagementfleet management

Externe Partner_innen

  • Wienstrom GmbH
  • Austrosoft Weiss Datenverarbeitungs Ges.m.b.H
  • Funktaxi 31300 VermittlungsgmbH & Co KG

Publikationen