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Distant positioning for GNSS securing / Marc Revol in Navigation aérienne, maritime, spatiale, terrestre, vol 62 n° 247 (mai 2015)
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Titre : Distant positioning for GNSS securing Titre original : Le positionnement à distance pour la sécurisation des GNSS Type de document : Article/Communication Auteurs : Marc Revol, Auteur Année de publication : 2015 Article en page(s) : pp 36 - 47 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] Global Navigation Satellite System
[Termes IGN] positionnement par GNSS
[Termes IGN] sécurité
[Termes IGN] signal GNSSRésumé : (Auteur) [Introduction] In line with PTA recommendations [6] (Protect, Toughen and Augment) arising from the GNSS world, different classes of solutions can be foreseen in order to provide gradual consolidations of the relevant safety and security issues. In order to perform a position calculation on the basis of secure GNSS signals (Galileo PRS, GPS P(Y), a classical receiver must implement a certain number of complex, notably cryptographic, processing operations that substantially increase their complexity and their cost, and need secured interface for keys loading. [...] Numéro de notice : A2015-459 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77153
in Navigation aérienne, maritime, spatiale, terrestre > vol 62 n° 247 (mai 2015) . - pp 36 - 47[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 094-2015021 RAB Revue Centre de documentation En réserve L003 Disponible Eliminating diffraction effects during multi-frequency correction in global navigation satellite systems / M.V. Tinin in Journal of geodesy, vol 89 n° 5 (May 2015)
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Titre : Eliminating diffraction effects during multi-frequency correction in global navigation satellite systems Type de document : Article/Communication Auteurs : M.V. Tinin, Auteur Année de publication : 2015 Article en page(s) : pp 491 - 503 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] correction du signal
[Termes IGN] correction ionosphérique
[Termes IGN] diffraction
[Termes IGN] positionnement par GPS
[Termes IGN] résidu
[Termes IGN] signal GNSS
[Termes IGN] signal multidimensionnelRésumé : (auteur) In the geometrical optics approximation, the ionospheric part of error in measuring phase and code delays of the satellite signal may be represented as a rapidly decreasing series in inverse power of frequency. Such a simple frequency dependence allows us to use multi-frequency measurements for eliminating the error in such multi-frequency Global Navigation Satellite Systems as GPS, GLONASS, BeiDou, and Galileo. However, the elimination of errors is handicapped by diffraction effects during signal propagation through turbulent ionospheric plasma. The numerical simulation has shown that when using the spatial processing in the form of Fresnel inversion the transition from dual-frequency to triple-frequency measurements reduces the average error of measurement. Yet fluctuations of the error diminish only if the inner scale exceeds the Fresnel radius. In the opposite case of excess of the Fresnel radius over the inner scale, the random component of the residual error is growing during the transition to triple-frequency measurements. The numerical simulation results also suggest that the Fresnel spatial processing in dual-frequency measurements at the optimal distance to the virtual screen can reduce the average error from centimeter to submillimeter level, which renders the transition to triple-frequency measurements unnecessary. The study of the residual error dependence on the distance from the virtual screen to the observer has revealed that the optimum value of this distance may be found from the minimum condition of amplitude scintillation index of the processed signal. The signal thus processed may be utilized both in geodetic precise measurements and in diagnostics of the lower atmosphere. Numéro de notice : A2015-349 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-015-0794-4 En ligne : https://doi.org/10.1007/s00190-015-0794-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76723
in Journal of geodesy > vol 89 n° 5 (May 2015) . - pp 491 - 503[article]Ionospheric effects in uncalibrated phase delay estimation and ambiguity-fixed PPP based on raw observable model / Shengfeng Gu in Journal of geodesy, vol 89 n° 5 (May 2015)
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Titre : Ionospheric effects in uncalibrated phase delay estimation and ambiguity-fixed PPP based on raw observable model Type de document : Article/Communication Auteurs : Shengfeng Gu, Auteur ; Chuang Shi, Auteur ; Yidong Lou, Auteur ; Jingnan Liu, Auteur Année de publication : 2015 Article en page(s) : pp 447 - 457 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] correction ionosphérique
[Termes IGN] modèle ionosphérique
[Termes IGN] positionnement cinématique en temps réel
[Termes IGN] positionnement ponctuel précis
[Termes IGN] propagation ionosphérique
[Termes IGN] résolution d'ambiguïté
[Termes IGN] retard ionosphèrique
[Termes IGN] signal GNSS
[Termes IGN] teneur totale en électronsRésumé : (auteur) Zero-difference (ZD) ambiguity resolution (AR) reveals the potential to further improve the performance of precise point positioning (PPP). Traditionally, PPP AR is achieved by Melbourne–Wübbena and ionosphere-free combinations in which the ionosphere effect are removed. To exploit the ionosphere characteristics, PPP AR with L1 and L2 raw observable has also been developed recently. In this study, we apply this new approach in uncalibrated phase delay (UPD) generation and ZD AR and compare it with the traditional model. The raw observable processing strategy treats each ionosphere delay as an unknown parameter. In this manner, both a priori ionosphere correction model and its spatio-temporal correlation can be employed as constraints to improve the ambiguity resolution. However, theoretical analysis indicates that for the wide-lane (WL) UPD retrieved from L1/L2 ambiguities to benefit from this raw observable approach, high precision ionosphere correction of better than 0.7 total electron content unit (TECU) is essential. This conclusion is then confirmed with over 1 year data collected at about 360 stations. Firstly, both global and regional ionosphere model were generated and evaluated, the results of which demonstrated that, for large-scale ionosphere modeling, only an accuracy of 3.9 TECU can be achieved on average for the vertical delays, and this accuracy can be improved to about 0.64 TECU when dense network is involved. Based on these ionosphere products, WL/narrow-lane (NL) UPDs are then extracted with the raw observable model. The NL ambiguity reveals a better stability and consistency compared to traditional approach. Nonetheless, the WL ambiguity can be hardly improved even constrained with the high spatio-temporal resolution ionospheric corrections. By applying both these approaches in PPP-RTK, it is interesting to find that the traditional model is more efficient in AR as evidenced by the shorter time to first fix, while the three-dimensional positioning accuracy of the RAW model outperforms the combination model by about 7.9%. This reveals that, with the current ionosphere models, there is actually no optimal strategy for the dual-frequency ZD ambiguity resolution, and the combination approach and raw approach each has merits and demerits. Numéro de notice : A2015-345 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-015-0789-1 Date de publication en ligne : 15/02/2015 En ligne : https://doi.org/10.1007/s00190-015-0789-1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76717
in Journal of geodesy > vol 89 n° 5 (May 2015) . - pp 447 - 457[article]Local GNSS monitoring / A. Guilloton in Navigation aérienne, maritime, spatiale, terrestre, vol 62 n° 247 (mai 2015)
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Titre : Local GNSS monitoring Type de document : Article/Communication Auteurs : A. Guilloton, Auteur ; B. Montagne, Auteur Année de publication : 2015 Article en page(s) : pp 26 - 35 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] Global Navigation Satellite System
[Termes IGN] interférence
[Termes IGN] qualité du signal
[Termes IGN] signal GNSSRésumé : (Auteur) [Introduction] Nowadays, GPS are used in many applications such as GBAS, SBAS, EGNOS and WAAS aircraft landing systems, unmanned road or aerial vehicles, wireline and wireless telecommunications networks, financial trading, electricity generation and supply, telematics insurance, tracking of assets, fleet vehicles and people, road user charging, geofenced applications... etc. GPS applications are vulnerable to jamming and spoofing, the former being intentional or not. [...] Numéro de notice : A2015-458 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77151
in Navigation aérienne, maritime, spatiale, terrestre > vol 62 n° 247 (mai 2015) . - pp 26 - 35[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 094-2015021 RAB Revue Centre de documentation En réserve L003 Disponible
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Titre : Predicting floods with GPS Type de document : Article/Communication Auteurs : Paul Grad, Auteur Année de publication : 2015 Article en page(s) : pp 24 - 26 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Australian Regional GPS Network ARGN
[Termes IGN] Australie
[Termes IGN] données GPS
[Termes IGN] inondation
[Termes IGN] réflectométrie par GNSS
[Termes IGN] teneur en vapeur d'eau
[Termes IGN] vapeur d'eauRésumé : (documentaliste) L'Australie recourt aux techniques spatiales comme le positionnement par GNSS et la réflectométrie par GNSS pour prévenir les inondations. Numéro de notice : A2015-370 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76845
in Position > n° 76 (April - May 2015) . - pp 24 - 26[article]Tsunami-wave parameter estimation using GNSS-based sea surface height measurement / Kegen Yu in IEEE Transactions on geoscience and remote sensing, vol 53 n° 5 (mai 2015)
PermalinkVegetation sensing using GPS-interferometric reflectometry: theoretical effects of canopy parameters on signal-to-noise ratio data / C.C. Chew in IEEE Transactions on geoscience and remote sensing, vol 53 n° 5 (mai 2015)
PermalinkCarrier-phase ambiguity resolution: Handling the biases for improved triple-frequency PPP convergence / Denis Laurichesse in GPS world, vol 26 n° 4 (April 2015)
PermalinkGalileo E1 and E5a Performance for multi-frequency, multi-constellation GBAS / Mihaela-Simona Circiu in GPS world, vol 26 n° 4 (April 2015)
PermalinkSHPTS: towards a new method for generating precise global ionospheric TEC map based on spherical harmonic and generalized trigonometric series functions / Zishen Li in Journal of geodesy, vol 89 n° 4 (April 2015)
PermalinkThree-Corner Hat for the assessment of the uncertainty of non-linear residuals of space-geodetic time series in the context of terrestrial reference frame analysis / Claudio Abbondanza in Journal of geodesy, vol 89 n° 4 (April 2015)
PermalinkEstimating ionospheric delay using GPS/Galileo signals in the E5 band / Olivier Julien in Inside GNSS, vol 10 n° 2 (March - April 2015)
PermalinkDevelopment and evaluation of GNSS/INS data processing software for position and orientation systems / X. Niu in Survey review, vol 47 n° 341 (March 2015)
PermalinkPermalinkLevelling co-located GNSS and tide gauge stations using GNSS reflectometry / Alvaro Santamaria Gomez in Journal of geodesy, vol 89 n° 3 (March 2015)
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