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GNSS multipath detection using three-frequency signal-to-noise measurements / Philip R.R. Strode in GPS solutions, vol 20 n° 3 (July 2016)  

Public [article]  inGPS solutions > vol 20 n° 3 (July 2016) . - pp 399 - 412 Titre : GNSS multipath detection using three-frequency signal-to-noise measurements Type de document : Article/Communication Auteurs : Philip R.R. Strode, Auteur ; Paul D. Groves, Auteur Année de publication : 2016 Article en page(s) : pp 399 - 412 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] correction du trajet multiple [Termes IGN] diffraction [Termes IGN] rapport signal sur bruit [Termes IGN] récepteur GNSS [Termes IGN] récepteur trifréquence [Vedettes matières IGN] Traitement de données GNSS Résumé : (Auteur) A new technique for detecting GNSS multipath interference by comparing signal-to-noise (SNR) measurements on three frequencies is presented. Depending on the phase lag of the reflected signal with respect to the direct signal, multipath interference can be either constructive or destructive, with a commensurate effect on the measured SNR. However, as the phase lag is frequency dependent, the SNR is perturbed differently on each frequency. Thus, by differencing SNR measurements on different frequencies and comparing the result with that obtained in a low-multipath environment, multipath can be detected. Using three frequencies makes the process more robust. A three-frequency SNR-based multipath detector has been developed and calibrated using measurements from GPS Block IIF satellites in a low-multipath environment. The new detector has been tested in a range of urban environments and its multipath detection capability verified by showing that the MP observables oscillate when the new detection statistic is above a threshold value determined using data collected in a low-multipath environment. The new detector is also sensitive to diffraction. Numéro de notice : A2016-631 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s10291-015-0449-1 En ligne : http://dx.doi.org/10.1007/s10291-015-0449-1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81834 [article]