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TitreStatus of the existing monitoring and forecasts for GNSS systems
TéléchargerTéléchargements
AuteurNikitina, L; Danskin, D W; Ghoddousi-Fard, R; Prikryl, P
SourceCommission géologique du Canada, Dossier public 7941, 2015, 46 pages, https://doi.org/10.4095/296982
Année2015
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/296982
Mediaen ligne; numérique
Formatspdf
Sujetstélédétection; satellites; imagerie par satellite; systèmes de satellites de navigation; perturbations magnétiques; orages magnétiques; champ magnétique; géomagnétisme; champs géomagnétiques; variations géomagnétiques; ionosphère; courants ionosphériques; géophysique
Illustrationshistograms; graphs; diagrams; photographs
Consultation
Endroit
 
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
 
ProgrammeNord du Canada, risque géoscience, Géoscience pour la sécurité publique
Diffusé2015 11 18
Résumé(Sommaire disponible en anglais seulement)
This report is a review of the monitoring and forecasts services for global navigation satellite systems (GNSS) that were publically available on the internet at the end of 2014. GNSS signals can be affected by ionospheric scintillation and distribution of electron density in the ionosphere caused by space weather disturbances. The intent of this document is to give description of available services and models, which may be useful in evaluating space weather effects on GNSS. In addition, some models which are available to evaluate the electron density distribution are summarized. A brief background is presented to explain the terminology, methodology and context of the GNSS field.
Based on the review of the existing models we can conclude that
- some models include the long-term variation of the solar activity (like 27 - days variation and 11years solar cycle variation);
- some empirical statistical models include the solar activity using Sunspot number and F10.7;
- the authors of some TEC models discuss the possibility of including the geomagnetic indices into ionospheric forecast;
- probabilistic models of scintillation could provide an estimation of the probability of scintillation in the ionosphere based on anticipated/forecasted ionospheric conditions;
- the existing TEC models that include diurnal and seasonal time variation cannot describe disturbances of the ionosphere and their impact on the GPS systems during space weather events because they are based on typical values assumed in climatology.
The document concludes by considering what services existed at the end of 2014 that may be used to determine if GNSS signals may be subject to an irregular ionosphere and potential disruption.
Résumé(Résumé en langage clair et simple, non publié)
Ce rapport est un examen de la surveillance et les prévisions des services pour les systèmes mondiaux de navigation par satellite (GNSS). Les signaux GNSS peuvent être touchées par scintillation ionosphérique et la distribution de la densité d'électrons dans l'ionosphère causés par les perturbations en espace. L'objectif de ce document est de fournir des services disponibles et description des modèles, qui peut être utile dans l'évaluation de effets des conditions météorologiques de l'espace sur le GNSS.
GEOSCAN ID296982