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PPP, Precise Point Positioning : constraints and opportunities / Katrin Huber (2010) 

Public Titre : PPP, Precise Point Positioning : constraints and opportunities Type de document : Article/Communication Auteurs : Katrin Huber, Auteur ; F. Heuberger, Auteur ; Christoph Abart, Auteur ; et al., Auteur Editeur : Fédération Internationale des Géomètres FIG - International Federation of Surveyors FIG Année de publication : 2010 Conférence : FIG 2010, international congress Facing the Challenges – Building the Capacity 11/04/2010 16/04/2010 Sydney Australie OA proceedings Importance : 17 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] convergence [Termes IGN] géonavigateur [Termes IGN] positionnement ponctuel précis [Termes IGN] récepteur GNSS Résumé : (Auteur) Precise Point Positioning (PPP) is a satellite based positioning technique aiming at highest accuracy in close to real-time. First investigations using dual frequency data from a single GPS receiver data for a few cm-positioning in post-processing mode have been published in 1997 by JPL. Utilizing the ionosphere free linear combination the remaining required model information like precise orbits and clocks issued by the IGS has been used. Within the last decade a number of approaches have been carried out to serve applications in close to realtime by this technique. In comparison with common techniques like DGPS or RTK, the costs are reduced, because no base stations and no simultaneous observations are necessary. On the other hand the necessary models have to be fetched either from globally acting services like IGS (orbits, satellite clocks) or from regional GNSS service providers (atmospheric delays) and standard interfaces (e.g. RTCM) have to be developed to forward this information to the rover. Further problems still to be solved are coordinate convergence periods of up to 2 hours as well as ambiguity resolution, which are harmed by non-integer calibration phase biases. These biases vanish only in difference mode and have to be determined a priori. The main focus of the research presented in this paper is to enhance the actual achievable accuracy of PPP and to reduce convergence time. Therefore detailed investigations on new PPP algorithms and methods are carried out within the project RA-PPP (Rapid Precise Point Positioning) focusing on the derivation of improved ionospheric models providing a better accuracy for single frequency users and on the use of “regional clocks” - a method to further enhance the positioning accuracy. Furthermore, linear combinations making use of new GNSS signals are investigated to improve the noise behavior with respect to commonly used linear combinations. Additionally, a PPP software module that applies the developed algorithms and techniques to real GNSS data is developed during the research project. PPP is performed by means of a commercial GNSS receiver supported by a small processing device, but much improved accuracies than operating in standard positioning mode can be achieved. Several testing and verification routines evaluate the performance of applied algorithms and individual calculation steps. Also a later modification with regard to GNSS modernization (new signals) is considered. Finally several fields of application, where the PPP technique is nowadays used and can be used in the future are presented. Numéro de notice : 14267 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Communication Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64329

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