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Les représentations planes cylindriques de la terre / Françoise Duquenne in XYZ, n° 157 (décembre 2018 - février 2019)

Public [article]  inXYZ > n° 157 (décembre 2018 - février 2019) . - pp 45 - 50 Titre : Les représentations planes cylindriques de la terre Type de document : Article/Communication Auteurs : Françoise Duquenne, Auteur Année de publication : 2018 Article en page(s) : pp 45 - 50 Note générale : bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Projections [Termes descripteurs IGN] canevas de projection [Termes descripteurs IGN] convergence des méridiens [Termes descripteurs IGN] facteur d'échelle [Termes descripteurs IGN] latitude [Termes descripteurs IGN] ligne géodésique [Termes descripteurs IGN] module linéaire [Termes descripteurs IGN] projection cylindrique [Termes descripteurs IGN] projection Universal Transverse Mercator Résumé : (auteur) The purpose of this paper is to recall th fundamental concept of the plane cylindrical representations of the earth, especially those which are conformal. Amongst these, the most known and used projection throughout the world is the Universal Transverse Mercator (UTM). The algorithm of calculation presented here, developed by French IGN, has the advantage of using exact formulas and not limited developments like many others, and thus of beeing easily computerized. Numéro de notice : A2018-534 Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91579 [article]

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Characterizing noise in daily GPS position time series with overlapping Hadamard variance and maximum likelihood estimation / Chang Xu in Survey review, vol 49 n° 355 (October 2017)  

Public [article]  inSurvey review > vol 49 n° 355 (October 2017) . - pp 239 - 248 Titre : Characterizing noise in daily GPS position time series with overlapping Hadamard variance and maximum likelihood estimation Type de document : Article/Communication Auteurs : Chang Xu, Auteur ; D. Yue, Auteur Année de publication : 2017 Article en page(s) : pp 239 - 248 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] bruit (théorie du signal) [Termes descripteurs IGN] bruit blanc [Termes descripteurs IGN] bruit rose [Termes descripteurs IGN] caractérisation [Termes descripteurs IGN] Chine [Termes descripteurs IGN] coordonnées GPS [Termes descripteurs IGN] latitude [Termes descripteurs IGN] méthode du maximum de vraisemblance (estimation) [Termes descripteurs IGN] série temporelle [Termes descripteurs IGN] signal aléatoire [Termes descripteurs IGN] station permanente [Termes descripteurs IGN] variance [Vedettes matières IGN] Traitement de données GNSS Résumé : (Auteur) We assess the noise characteristics of daily position time series (Jet Propulsion Laboratory global solutions) from 12 International GNSS Service sites located in China, using both overlapping Hadamard variance (OHVAR) and maximum likelihood estimation (MLE). The result shows that OHVAR is computationally cheap, and the dominate power-law noise inferred is in good agreement with the ones inferred by comparing MLE values. However, OHVAR is insufficient to assess the long-period noise characteristics [e.g., random walk noise (RW)]. From the MLE analysis, the RW contribution is likely to be present in 14% of the time series, while the noise of most sites are characterized by a combination of white and flicker (or power law) noise (i.e., FL + WH or PL + WH). Moreover, sites near the northern crest of the equatorial ionization anomaly have larger amplitudes of WH in the vertical component, while no clear latitude dependency is observed in FL amplitudes. Numéro de notice : A2017-547 Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/00396265.2016.1163830 En ligne : https://doi.org/10.1080/00396265.2016.1163830 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86602 [article]

Performance evaluation of ionospheric time delay forecasting models using GPS observations at a low-latitude station / G. Sivavaraprasad in Advances in space research, vol 60 n° 2 (15 July 2017)  

Public [article]  inAdvances in space research > vol 60 n° 2 (15 July 2017) . - pp 475 - 490 Titre : Performance evaluation of ionospheric time delay forecasting models using GPS observations at a low-latitude station Type de document : Article/Communication Auteurs : G. Sivavaraprasad, Auteur ; D. Venkata Ratman, Auteur Année de publication : 2017 Article en page(s) : pp 475 - 490 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] données GPS [Termes descripteurs IGN] données météorologiques [Termes descripteurs IGN] Inde [Termes descripteurs IGN] International Reference Ionosphere [Termes descripteurs IGN] latitude [Termes descripteurs IGN] modèle de simulation [Termes descripteurs IGN] modèle ionosphérique [Termes descripteurs IGN] retard ionosphèrique [Termes descripteurs IGN] teneur totale en électrons [Termes descripteurs IGN] teneur verticale totale en électrons [Termes descripteurs IGN] test de performance [Vedettes matières IGN] Traitement de données GNSS Résumé : (auteur) Ionospheric delay is one of the major atmospheric effects on the performance of satellite-based radio navigation systems. It limits the accuracy and availability of Global Positioning System (GPS) measurements, related to critical societal and safety applications. The temporal and spatial gradients of ionospheric total electron content (TEC) are driven by several unknown priori geophysical conditions and solar-terrestrial phenomena. Thereby, the prediction of ionospheric delay is challenging especially over Indian sub-continent. Therefore, an appropriate short/long-term ionospheric delay forecasting model is necessary. Hence, the intent of this paper is to forecast ionospheric delays by considering day to day, monthly and seasonal ionospheric TEC variations. GPS-TEC data (January 2013–December 2013) is extracted from a multi frequency GPS receiver established at K L University, Vaddeswaram, Guntur station (geographic: 16.37°N, 80.37°E; geomagnetic: 7.44°N, 153.75°E), India. An evaluation, in terms of forecasting capabilities, of three ionospheric time delay models – an Auto Regressive Moving Average (ARMA) model, Auto Regressive Integrated Moving Average (ARIMA) model, and a Holt-Winter's model is presented. The performances of these models are evaluated through error measurement analysis during both geomagnetic quiet and disturbed days. It is found that, ARMA model is effectively forecasting the ionospheric delay with an accuracy of 82–94%, which is 10% more superior to ARIMA and Holt-Winter’s models. Moreover, the modeled VTEC derived from International Reference Ionosphere, IRI (IRI-2012) model and new global TEC model, Neustrelitz TEC Model (NTCM-GL) have compared with forecasted VTEC values of ARMA, ARIMA and Holt-Winter’s models during geomagnetic quiet days. The forecast results are indicating that ARMA model would be useful to set up an early warning system for ionospheric disturbances at low latitude regions. Numéro de notice : A2017-252 Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern En ligne : https://doi.org/10.1016/j.asr.2017.01.031 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85254 [article]

Performance evaluation of GNSS-TEC estimation techniques at the grid point in middle and low latitudes during different geomagnetic conditions / O. E. Abe in Journal of geodesy, vol 91 n° 4 (April 2017)  

Public [article]  inJournal of geodesy > vol 91 n° 4 (April 2017) . - pp 409 - 417 Titre : Performance evaluation of GNSS-TEC estimation techniques at the grid point in middle and low latitudes during different geomagnetic conditions Type de document : Article/Communication Auteurs : O. E. Abe, Auteur ; X. Otero Villamide, Auteur ; C. Paparini, Auteur ; et al., Auteur Année de publication : 2017 Article en page(s) : pp 409 - 417 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes descripteurs IGN] champ géomagnétique [Termes descripteurs IGN] erreur systématique [Termes descripteurs IGN] Espagne [Termes descripteurs IGN] estimation statistique [Termes descripteurs IGN] étalonnage [Termes descripteurs IGN] évaluation [Termes descripteurs IGN] Ghana [Termes descripteurs IGN] latitude [Termes descripteurs IGN] performance [Termes descripteurs IGN] signal GNSS [Termes descripteurs IGN] teneur totale en électrons [Termes descripteurs IGN] traitement du signal Résumé : (auteur) Global Navigation Satellite Systems (GNSS) have become a powerful tool use in surveying and mapping, air and maritime navigation, ionospheric/space weather research and other applications. However, in some cases, its maximum efficiency could not be attained due to some uncorrelated errors associated with the system measurements, which is caused mainly by the dispersive nature of the ionosphere. Ionosphere has been represented using the total number of electrons along the signal path at a particular height known as Total Electron Content (TEC). However, there are many methods to estimate TEC but the outputs are not uniform, which could be due to the peculiarity in characterizing the biases inside the observables (measurements), and sometimes could be associated to the influence of mapping function. The errors in TEC estimation could lead to wrong conclusion and this could be more critical in case of safety-of-life application. This work investigated the performance of Ciraolo’s and Gopi’s GNSS-TEC calibration techniques, during 5 geomagnetic quiet and disturbed conditions in the month of October 2013, at the grid points located in low and middle latitudes. The data used are obtained from the GNSS ground-based receivers located at Borriana in Spain (40∘N, 0∘E; mid latitude) and Accra in Ghana (5.50∘N, −0.20∘E; low latitude). The results of the calibrated TEC are compared with the TEC obtained from European Geostationary Navigation Overlay System Processing Set (EGNOS PS) TEC algorithm, which is considered as a reference data. The TEC derived from Global Ionospheric Maps (GIM) through International GNSS service (IGS) was also examined at the same grid points. The results obtained in this work showed that Ciraolo’s calibration technique (a calibration technique based on carrier-phase measurements only) estimates TEC better at middle latitude in comparison to Gopi’s technique (a calibration technique based on code and carrier-phase measurements). At the same time, Gopi’s calibration was also found more reliable in low latitude than Ciraolo’s technique. In addition, the TEC derived from IGS GIM seems to be much reliable in middle-latitude than in low-latitude region. Numéro de notice : A2017-107 Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern En ligne : http://dx.doi.org/10.1007/s00190-016-0972-z Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84497 [article]

From the portolan chart to the latitude chart / Joaquim Alves Gaspar in Cartes & Géomatique, n° 216 (juin 2013)  

Public [article]  inCartes & Géomatique > n° 216 (juin 2013) . - pp 67 - 77 Titre : From the portolan chart to the latitude chart Type de document : Article/Communication Auteurs : Joaquim Alves Gaspar, Auteur Année de publication : 2013 Article en page(s) : pp 67 - 77 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie ancienne [Termes descripteurs IGN] carte marine [Termes descripteurs IGN] latitude [Termes descripteurs IGN] navigation maritime [Termes descripteurs IGN] portulan [Termes descripteurs IGN] précision cartographique [Termes descripteurs IGN] précision du positionnement [Termes descripteurs IGN] Renaissance [Termes descripteurs IGN] seizième siècle Résumé : (Auteur) This paper explains how, following the introduction of astronomical navigation, the transition between the portolan-type chart of the Mediterranean and the latitude chart of the Atlantic was facilitated by the small values of the magnetic declination occurring in western Europe during the Renaissance. The results of two preliminary cartometric studies of a sample of charts of the sixteenth century are presented, focused on the latitude accuracy in the representation of northern Europe and on the evolution of the longitudinal width of the Mediterranean and Africa Numéro de notice : A2013-431 Thématique : GEOMATIQUE Nature : Article DOI : sans En ligne : http://www.lecfc.fr/new/articles/216-article-6.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32569 [article]

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Geolocation and time: an evolution of the millennial pair, Part 1 / J. Triglav in Geoinformatics, vol 12 n° 7 (01/10/2009)

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N48°26'58" : le plus long parallèle de France / K. Drame in XYZ, n° 106 (mars - mai 2006)

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Des longitudes et des mers : la genèse de la navigation (1/3) / Frédéric Bretar in XYZ, n° 102 (mars - mai 2005)

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Accuracy of the coefficient expansion of the transverse Mercator projection / E. Enriquez in International journal of geographical information science IJGIS, vol 18 n° 6 (october 2004)

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L'aventure cartographique / Jean Lefort (2004)

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Une histoire du point en mer / A. Gillet (2000)

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Collected papers of Raimundo O. Vicente on geodynamics, geodesy and astronomy / R.O. Vicente (1998)

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Astronomie / Françoise Duquenne (1997)

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GPS made easy / L. Letham (1996)

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Analyse de données astrométriques et climatiques / Marie-Noëlle Bouin (1994)

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