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On improving precision of GPS-derived height times series at GEONET stations / H. Munekane in Bulletin of the GeoSpatial Information authority of Japan, vol 58 (December 2010)  

Public [article]  inBulletin of the GeoSpatial Information authority of Japan > vol 58 (December 2010) . - pp 39 - 46 Titre : On improving precision of GPS-derived height times series at GEONET stations Type de document : Article/Communication Auteurs : H. Munekane, Auteur Année de publication : 2010 Article en page(s) : pp 39 - 46 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] altitude [Termes IGN] Japon [Termes IGN] positionnement par GPS [Termes IGN] réseau géodésique local [Termes IGN] série temporelle [Termes IGN] station permanente Résumé : (Auteur) This paper summarizes the effect of various noises on GEONET height times series and demonstrates how the state-of-art analysis technique can improve its quality with the results evaluated by simulations and actual observations. Three factors that may affect the GPS-derived height time series are investigated: 1) mismodeling of atmospheric delays; 2) load deformation by the atmosphere; and 3) load deformation by the ocean. It is found that : 1) the use of the conventional mapping functions that are used in the current GEONET routine analysis may introduce spurious annual height variations up to 3 mm, and these spurious signals can be considerably mitigated with the use of mapping functions based on numerical weather models; 2) annual height variations caused by the atmospheric loading are up to 3 mm ; and 3) the annual variations caused by oceanic loading deformation get larger toward the south, reaching 3 mm in the Nansei Islands. It confirmed that when corrections are applied in the GPS analysis of GEONET data, the annual height variations of GEONET stations are largely reduced. Hence, it may now be possible to detect even these small movements related to the earthquake/volcanic activities that were formally obscured by the annual height noises, offering a hope that more accurate disaster prevention information could be provided. Numéro de notice : A2010-580 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : https://www.gsi.go.jp/common/000058372.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30771 [article]