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Co-seismic displacement estimation / M. Crespi in GIM international, vol 25 n° 5 (May 2011)
[article]
Titre : Co-seismic displacement estimation Type de document : Article/Communication Auteurs : M. Crespi, Auteur ; G. Colosimo, Auteur ; A. Mazzoni, Auteur ; T. Dautermann, Auteur Année de publication : 2011 Article en page(s) : pp 19 - 23 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] forme d'onde
[Termes IGN] onde sismique
[Termes IGN] phase
[Termes IGN] positionnement cinématique en temps réel
[Termes IGN] positionnement par GPS
[Termes IGN] séisme
[Termes IGN] surveillance géologique
[Termes IGN] tsunamiRésumé : (Auteur) Geomatics is not primarily aimed at investigating the causes and physical phenomena related to earthquake events. It has, however, over recent years established a fundamental role in monitoring and describing changes to the Earth’s surface. In particular, this article describes the state of the art of the GPS contribution to Seismology, and presents an innovative methodology, VADASE, that enables accurate estimation of co-seismic displacement waveforms in real time using standard broadcast products and high-rate carrier-phase observations collected by a unique GPS receiver. This represents a potential enhancement to GPS Seismology and an effective support for tsunami early warning systems. Numéro de notice : A2011-167 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30945
in GIM international > vol 25 n° 5 (May 2011) . - pp 19 - 23[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 061-2011051 RAB Revue Centre de documentation Revues en salle Disponible Doppler-aided positioning: Improving single-frequency in the urban environment / M. Bahrami in GPS world, vol 22 n° 5 (May 2011)
[article]
Titre : Doppler-aided positioning: Improving single-frequency in the urban environment Type de document : Article/Communication Auteurs : M. Bahrami, Auteur ; Marek Ziebart, Auteur Année de publication : 2011 Article en page(s) : pp 47 - 56 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] données Doppler
[Termes IGN] effet Doppler
[Termes IGN] géonavigateur
[Termes IGN] lissage de données
[Termes IGN] mesurage de pseudo-distance
[Termes IGN] milieu urbain
[Termes IGN] positionnement cinématique en temps réel
[Termes IGN] récepteur monofréquenceRésumé : (Editeur) What do a GPS receiver, a policeman’s speed gun, a weather radar, and some medical diagnostic equipment have in common? Give up? They all make use of the Doppler effect. First proposed in 1842 by the Austrian mathematician and physicist, Christian Doppler, it is the change in the perceived frequency of a wave when the transmitter and the receiver are in relative motion. Doppler introduced the concept in an attempt to explain the shift in the color of light from certain binary stars. Three years later, the effect was tested for sound waves by the Dutch scientist Christophorus Buys Ballot. [...] The beginning of the space age heralded a new application of the Doppler effect. By measuring the shift in the received frequency of the radio beacon signals transmitted by Sputnik 1 from a known location, scientists were able to determine the orbit of the satellite. And shortly thereafter, they determined that if the orbit of a satellite was known, then the position of a receiver could be determined from the shift. That realization led to the development of the United States Navy Navigation Satellite System, commonly known as Transit, with the first satellite being launched in 1961. Initially classified, the system was made available to civilians in 1967 and was widely used for navigation and precise positioning until it was shut down in 1996. The Soviet Union developed a similar system called Tsikada and a special military version called Parus. These systems are also assumed to be no longer in use — at least for navigation. GPS and other global navigation satellite systems use the Doppler shift of the received carrier frequencies to determine the velocity of a moving receiver. Doppler-derived velocity is far more accurate than that obtained by simply differencing two position estimates. But GPS Doppler measurements can be used in other ways, too. In this month’s column, we look at how Doppler measurements can be used to smooth noisy code-based pseudoranges to improve the precision of autonomous positioning as well as to improve the availability of single-frequency real-time kinematic positioning, especially in urban environments. Numéro de notice : A2011-180 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30958
in GPS world > vol 22 n° 5 (May 2011) . - pp 47 - 56[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-2011051 RAB Revue Centre de documentation En réserve L003 Disponible
[article]
Titre : GNSS algebraic structures Type de document : Article/Communication Auteurs : A. Lannes, Auteur ; Peter J.G. Teunissen, Auteur Année de publication : 2011 Article en page(s) : pp 273 - 290 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] double différence
[Termes IGN] erreur systématique
[Termes IGN] étalonnage d'instrument
[Termes IGN] mesurage de phase
[Termes IGN] phase GNSS
[Termes IGN] positionnement cinématique en temps réel
[Termes IGN] positionnement par GNSS
[Termes IGN] positionnement ponctuel précisRésumé : (Auteur) The first objective of this paper is to show that some basic concepts used in global navigation satellite systems (GNSS) are similar to those introduced in Fourier synthesis for handling some phase calibration problems. In experimental astronomy, the latter are at the heart of what is called phase closure imaging.' In both cases, the analysis of the related structures appeals to the algebraic graph theory and the algebraic number theory. For example, the estimable functions of carrier-phase ambiguities, which were introduced in GNSS to correct some rank defects of the undifferenced equations, prove to be closure-phase ambiguities:' the so-called closure-delay' (CD) ambiguities. The notion of closure delay thus generalizes that of double difference (DD). The other estimable functional variables involved in the phase and code undifferenced equations are the receiver and satellite pseudo-clock biases. A related application, which corresponds to the second objective of this paper, concerns the definition of the clock information to be broadcasted to the network users for their precise point positioning (PPP). It is shown that this positioning can be achieved by simply having access to the satellite pseudo-clock biases. For simplicity, the study is restricted to relatively small networks. Concerning the phase for example, these biases then include five components: a frequency-dependent satellite-clock error, a tropospheric satellite delay, an ionospheric satellite delay, an initial satellite phase, and an integer satellite ambiguity. The form of the PPP equations to be solved by the network user is then similar to that of the traditional PPP equations. As soon as the CD ambiguities are fixed and validated, an operation which can be performed in real time via appropriate decorrelation techniques, estimates of these float biases can be immediately obtained. No other ambiguity is to be fixed. The satellite pseudo-clock biases can thus be obtained in real time. This is not the case for the satellite-clock biases. The third objective of this paper is to make the link between the CD approach and the GNSS methods based on the notion of double difference. In particular, it is shown that the information provided by a maximum set of independent DDs may not reach that of a complete set of CDs. The corresponding defect is analyzed. One of the main results of the corresponding analysis concerns the DDCD relationship. In particular, it is shown that the DD ambiguities, once they have been fixed and validated, can be used as input data in the undifferenced CD equations.' The corresponding algebraic operations are described. The satellite pseudo-clock biases can therefore be also obtained via particular methods in which the notion of double differencing is involved. Numéro de notice : A2011-198 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-010-0435-x Date de publication en ligne : 05/01/2011 En ligne : https://doi.org/10.1007/s00190-010-0435-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30976
in Journal of geodesy > vol 85 n° 5 (May 2011) . - pp 273 - 290[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2011051 RAB Revue Centre de documentation En réserve L003 Disponible Position: 20 kilometers, heavy construction: world's longest immersed tunnel, 40 meters underwater / A. Jensen in GPS world, vol 22 n° 5 (May 2011)
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Titre : Position: 20 kilometers, heavy construction: world's longest immersed tunnel, 40 meters underwater Type de document : Article/Communication Auteurs : A. Jensen, Auteur ; D. Hermsmeyer, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 30 - 37 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] Allemagne
[Termes IGN] Danemark
[Termes IGN] niveau moyen des mers
[Termes IGN] positionnement cinématique en temps réel
[Termes IGN] réseau géodésique spécifique
[Termes IGN] station GNSS
[Termes IGN] système de référence local
[Termes IGN] tunnelRésumé : (Auteur) The Fehmarnbelt Positioning System between Denmark and Germany includes a geodetic basis, four permanent GNSS stations, and a real-time kinematic (RTK) service for construction of a road and rail causeway between the islands of Fehmarn, Germany, and Lolland, Denmark across the Fehmarnbelt, a 20-kilometer stretch of open water in the Baltic Sea. This homogeneous, consistent, coherent, highly accurate GNSS-based positioning system exemplifies comparable systems and services that can be established for any major construction site or infrastructure project. Now in use for environmental, geotechnical, and geophysical investigations, it provides cost-efficient operations and facilitates the precise navigation of large, costly offshore equipment. Numéro de notice : A2011-179 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30957
in GPS world > vol 22 n° 5 (May 2011) . - pp 30 - 37[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-2011051 RAB Revue Centre de documentation En réserve L003 Disponible
[article]
Titre : HIS: Golden Horn GIS Type de document : Article/Communication Auteurs : R. Alkan, Auteur ; Y. Kalkan, Auteur ; C. Erdogan, Auteur Année de publication : 2011 Article en page(s) : pp 21 - 25 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web
[Termes IGN] acquisition de données
[Termes IGN] base de données localisées
[Termes IGN] Istanbul (Turquie)
[Termes IGN] positionnement cinématique en temps réel
[Termes IGN] positionnement par GPS
[Termes IGN] SIG nomade
[Termes IGN] système d'information géographique
[Termes IGN] WebSIGRésumé : (Auteur) As part of an ongoing project to bring to city managers, citizens, tourists and other geo-data of the Golden Horn area of Istanbul, Turkey, the authors designed a geo-database accessible both via desktop computers connected to the internet and wireless handheld mobile GIS devices used in the field. Numéro de notice : A2011-065 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans En ligne : http://www.gim-international.com/content/article/his-golden-horn-gis Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30846
in GIM international > vol 25 n° 3 (March 2011) . - pp 21 - 25[article]Regional reference network augmented precise point positioning for instantaneous ambiguity resolution / X. Li in Journal of geodesy, vol 85 n° 3 (March 2011)PermalinkMeasurement accuracy in Network-RTK / R. Emardson in Bulletin of geodesy and geomatics BGG, vol 69 n° 2 - 3 (December 2010)PermalinkMobile laser scanning on the road / Riegl in GEO: Geoconnexion international, vol 9 n° 9 (october 2010)PermalinkRobust Kalman filtering with constraints: a case study for integrated navigation / Y. Yang in Journal of geodesy, vol 84 n° 6 (June 2010)PermalinkSingle receiver phase ambiguity resolution with GPS data / Willy I. Bertiger in Journal of geodesy, vol 84 n° 5 (May 2010)PermalinkReal-time adjustment underwater positioning system for submarines / W. Cheng in Marine geodesy, vol 33 n° 2-3 (April - September 2010)PermalinkReal-time registration of airborne laser with sub-decimeter accuracy / Jan Skaloud in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 2 (March - April 2010)PermalinkWide-area RTK: high precision positioning on a continental scale / Manuel Hernández-Pajares in Inside GNSS, vol 5 n° 2 (March - April 2010)PermalinkGNSS for vehicle control / D.M. Bevly (2010)PermalinkNavigation Signal Processing for GNSS Software Receivers / T. Pany (2010)Permalink