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Kaj Grønbæk

Indoor Positioning Using GPS Revisited

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisKonferenceartikelForskningpeer review



  • Mikkel Baun Kjærgaard, Danmark
  • Henrik Blunck, Danmark
  • Torben Godsk, Danmark
  • Thomas Toftkjær, Danmark
  • Dan Lund Christensen, Alexandra Institutet A/S, Danmark
  • Kaj Grønbæk
  • Datalogisk Institut

It has been considered a fact that GPS performs too poorly inside

buildings to provide usable indoor positioning. We analyze results of a measurement

campaign to improve on the understanding of indoor GPS reception characteristics.

The results show that using state-of-the-art receivers GPS availability

is good in many buildings with standard material walls and roofs. The measured

root mean squared 2D positioning error was below five meters in wooden

buildings and below ten meters in most of the investigated brick and concrete

buildings. Lower accuracies, where observed, can be linked to either low signalto-

noise ratios, multipath phenomena or bad satellite constellation geometry. We

have also measured the indoor performance of embedded GPS receivers in mobile

phones which provided lower availability and accuracy than state-of-the-art ones.

Finally, we consider how the GPS performance within a given building is dependent

on local properties like close-by building elements and materials, number of

walls, number of overlaying stories and surrounding buildings.

BogserieLecture Notes in Computer Science
Sider (fra-til)38-56
Antal sider19
StatusUdgivet - 2010
BegivenhedThe 8th International Conference on Pervasive Computing - Helsinki, Finland
Varighed: 17 maj 201020 maj 2010
Konferencens nummer: 8


KonferenceThe 8th International Conference on Pervasive Computing

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