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Navigation for precision approaches: robust integrity monitoring using GPS + Galileo / P. Misra in GPS world, vol 15 n° 4 (April 2004)

Public [article]  inGPS world > vol 15 n° 4 (April 2004) Titre : Navigation for precision approaches: robust integrity monitoring using GPS + Galileo Type de document : Article/Communication Auteurs : P. Misra, Auteur ; S. Bednarz, Auteur Année de publication : 2004 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] affaiblissement de la précision [Termes IGN] Galileo [Termes IGN] Global Navigation Satellite System [Termes IGN] Global Positioning System [Termes IGN] intégrité des données [Termes IGN] mesurage de pseudo-distance [Termes IGN] modèle d'erreur Résumé : (Auteur) The performance of any navigation systemsis characterized by its accuracy, availability, continuity, and integrity. From a safety point of view, integrity is arguably the most important factor. Without some assurance of a system's integrity, we have no way of knowing whether the navigation information we receive is correct : How are we to know whether a navigation system is actually achieving its advertised accuracy and not misleading us with faulty information ? Although standalone GPS provides a certain level of integrity through self-monitoring in the satellites and signal monitoring by the GPS control segment, it is insufficient for aircraft conducting precision approaches to airport runways.The wide and local area augmentation systems offer a much higher level of integrity than standalone GPS. This is achieved, in part, by the aircraft receiver computing a high-confidence upper bound on its position error from the data it receives from the augmentation signals. As long as the computed error bound is below a preset value, safe navigation is assured with an extremely high level of confidence. However, the error bound is based on the assumption that the errors are distributed according to a normal or Gaussian probability distribution. Unfortunately, the positions determined using corrections from the augmentation systems have errors which do not quite follow such a distribution. The current approach to handling this phenomenon is to overbound the errors with a protection limit which safely accounts for the occasional larger than "normal" errors. Here, is discussed a promising alternative integrity monitoring technique that needs no assumption on the error distribution - a technique that will see a marriage of GPS with the eagerly anticipated Galileo system. Numéro de notice : A2004-576 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27092 [article]

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