Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux

Type de document

COMMUNICATION AVEC ACTES INTERNATIONAL (ACTI)

Langue

anglais

Auteur

PIÑANA-DIAZ ; TOLEDO MOREO ; GOMEZ-SKARMETA ; BETAILLE ; PEYRET

Résumé / Abstract

Global Positioning Systems (GPS) may suffer severe errors in urban environments due to the lack of good coverage and the multipath propagation of the satellite signals caused mostly by buildings. Receivers not always are capable of removing multipath signals, especially when satellites are in non-line-of-sight (NLOS) and there are not the corresponding line-of-sight (LOS) signals to compare with and discriminate the faulty one. This leads to wrong pseudorange measurements and errors in the solution of the position computation. This paper presents a solution to the problem of detecting which GPS signals arrive at the receiver in NLOS, thus enabing multipath- free positioning estimates. To it so, elevation-enhanced maps (EEmaps) that model buildings’ positions and heights are exploited. The description of the EEmaps, the NLOS detection algorithm and the results obtained in a test campaign are presented in the paper.