Predictive text: assessing the performance of Galileo

At the 2006 ITS World Congress, Jeremy Evans from Transport for London (TfL) stated that global positioning system (GPS) technology was sufficient for some forms of road pricing, but technical issues remained to be solved. Galileo, the EU's global navigation satellite system (GNSS) is likely to solve some of these. In combination with the European Space Agency (ESA), TfL has conducted tests to assess how much Galileo can improve GNSS performance in London. GMV's Polaris was used to assess performance. Predictions were qualified by comparing the actual performance of GPS in London with the performance predicted by simulation. There was a good correlation between actual and predicted performance in simple scenarios, but in the more complex scenarios, predicted performance varied 25% from actual performance. The Horizontal Accuracy and Horizontal Dilution of Precision (HDOP) were dependent on the inner workings of the specific GNNS device. Three maps were constructed to illustrate GPS performance improvement due to Galileo.

  • Availability:
  • Authors:
    • Edwards, G
    • APPELBE, H
  • Publication Date: 2007


  • English

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Filing Info

  • Accession Number: 01061064
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Sep 10 2007 2:10PM