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GPS IIF-1 satellite: Antenna phase center and attitude modeling / F. Dilssner in Inside GNSS, vol 5 n° 6 (September 2010)
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Titre : GPS IIF-1 satellite: Antenna phase center and attitude modeling Type de document : Article/Communication Auteurs : F. Dilssner, Auteur Année de publication : 2010 Article en page(s) : 6 p. ; pp 59 - 64 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] antenne GPS
[Termes IGN] centre de phase
[Termes IGN] orientation du capteur
[Termes IGN] phase GPS
[Termes IGN] satellite GPSRésumé : (Auteur) Calculating the distances between satellites and user equipment is a basic operation for GNSS positioning. More precisely, these ranges are measured from the antenna phase centers of the satellites’ transmitting antenna. However, phase centers vary among types and generations of spacecraft and, further, the calculation requires knowledge of a satellite’s orientation or attitude. A researcher at the European Space Operations Center has analyzed the initial performance of the first GPS Block IIF space vehicle and found some expected - and unexpected - results. Numéro de notice : A2010-672 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33454
in Inside GNSS > vol 5 n° 6 (September 2010) . - 6 p. ; pp 59 - 64[article]Documents numériques
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GPS IIF-1 satellite ... - scanAdobe Acrobat PDFInteger ambiguity resolution in precise point positionning : method comparison / J. Geng in Journal of geodesy, vol 84 n° 9 (September 2010)
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Titre : Integer ambiguity resolution in precise point positionning : method comparison Type de document : Article/Communication Auteurs : J. Geng, Auteur ; X. Meng, Auteur ; A. Dodson, Auteur ; Felix Norman Teferle, Auteur Année de publication : 2010 Article en page(s) : pp 569 - 581 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] ambiguïté entière
[Termes IGN] analyse comparative
[Termes IGN] positionnement par GNSS
[Termes IGN] positionnement ponctuel précis
[Termes IGN] précision millimétrique
[Termes IGN] résolution d'ambiguïtéRésumé : (Auteur) Integer ambiguity resolution at a single receiver can be implemented by applying improved satellite products where the fractional-cycle biases (FCBs) have been separated from the integer ambiguities in a network solution. One method to achieve these products is to estimate the FCBs by averaging the fractional parts of the float ambiguity estimates, and the other is to estimate the integer-recovery clocks by fixing the undifferenced ambiguities to integers in advance. In this paper, we theoretically prove the equivalence of the ambiguity-fixed position estimates derived from these two methods by assuming that the FCBs are hardware-dependent and only they are assimilated into the clocks and ambiguities. To verify this equivalence, we implement both methods in the Position and Navigation Data Analyst software to process 1 year of GPS data from a global network of about 350 stations. The mean biases between all daily position estimates derived from these two methods are only 0.2, 0.1 and 0.0 mm, whereas the standard deviations of all position differences are only 1.3, 0.8 and 2.0 mm for the East, North and Up components, respectively. Moreover, the differences of the position repeatabilities are below 0.2 mm on average for all three components. The RMS of the position estimates minus those from the International GNSS Service weekly solutions for the former method differs by below 0.1 mm on average for each component from that for the latter method. Therefore, considering the recognized millimeter-level precision of current GPS-derived daily positions, these statistics empirically demonstrate the theoretical equivalence of the ambiguity-fixed position estimates derived from these two methods. In practice, we note that the former method is compatible with current official clock-generation methods, whereas the latter method is not, but can potentially lead to slightly better positioning quality. Numéro de notice : A2010-416 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-010-0399-x Date de publication en ligne : 06/08/2010 En ligne : https://doi.org/10.1007/s00190-010-0399-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30609
in Journal of geodesy > vol 84 n° 9 (September 2010) . - pp 569 - 581[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2010091 SL Revue Centre de documentation Revues en salle Disponible Interface control : GNSS update / Huibert-Jan Lekkerkerk in Geoinformatics, vol 13 n° 6 (01/09/2010)
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Titre : Interface control : GNSS update Type de document : Article/Communication Auteurs : Huibert-Jan Lekkerkerk, Auteur Année de publication : 2010 Article en page(s) : pp 32 - 33 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] BeiDou
[Termes IGN] géonavigateur
[Termes IGN] Global Navigation Satellite System
[Termes IGN] positionnement par Galileo
[Termes IGN] positionnement par GPS
[Termes IGN] récepteur mixteRésumé : (Auteur) A joint workgroup from US and Eu annouced in early august that combined GPS plus Galileo receivers offer significant benefits when compared to single-systems receivers. That said, the benefits will of course only materialize when both systems are operational. According to the latest news, that moment may still lie more than a few years in the future. Meanwhile, development of Compass / Beidou inChina progresses with two new satellites and the publication of the new signal structure. Numéro de notice : A2010-345 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30539
in Geoinformatics > vol 13 n° 6 (01/09/2010) . - pp 32 - 33[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 262-2010061 SL Revue Centre de documentation Revues en salle Disponible Spoofing detection and mitigation with a moving handheld receiver / J. Nielsen in GPS world, vol 21 n° 9 (September 2010)
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Titre : Spoofing detection and mitigation with a moving handheld receiver Type de document : Article/Communication Auteurs : J. Nielsen, Auteur ; Ali Broumandan, Auteur ; Gérard Lachapelle, Auteur Année de publication : 2010 Article en page(s) : pp 27 - 33 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] anti-leurrage
[Termes IGN] géonavigateur
[Termes IGN] prévention
[Termes IGN] protection civile
[Termes IGN] récepteur GNSS
[Termes IGN] sécurité informatiqueRésumé : (Auteur) [introduction] Ubiquitous adoption of and reliance upon GPS makes national and commercial infrastructures increasingly vulnerable to attack by criminals, terrorists, or hackers. Some GNSS signals such as GPS P(Y) and M-code, GLONASS P-code, and Galileo’s Public Regulated Service have been encrypted to deny unauthorized access; however, the security threat of corruption of civilian GNSS signals increases constantly and remains an unsolved problem. We present here an efficient approach for the detection and mitigation of spoofed GNSS signals, as a proposed countermeasure to add to the existing system. Numéro de notice : A2010-373 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30567
in GPS world > vol 21 n° 9 (September 2010) . - pp 27 - 33[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-2010091 RAB Revue Centre de documentation En réserve L003 Disponible A first look at the effects of ionospheric signal bending on a globally processed GPS network / E. Petrie in Journal of geodesy, vol 84 n° 8 (August 2010)
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Titre : A first look at the effects of ionospheric signal bending on a globally processed GPS network Type de document : Article/Communication Auteurs : E. Petrie, Auteur ; M. King, Auteur ; P. Moore, Auteur ; David Lavallée, Auteur Année de publication : 2010 Article en page(s) : pp 491 - 499 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] atténuation du signal
[Termes IGN] correction ionosphérique
[Termes IGN] propagation ionosphérique
[Termes IGN] réfraction atmosphérique
[Termes IGN] retard troposphérique zénithal
[Termes IGN] signal GPSRésumé : (Auteur) This study provides a first attempt at quantifying potential signal bending effects on the GPS reference frame, coordinates and zenith tropospheric delays (ZTDs). To do this, we homogeneously reanalysed data from a global network of GPS sites spanning 14 years (1995.0–2009.0). Satellite, Earth orientation, tropospheric and ground station coordinate parameters were all estimated. We tested the effect of geometric bending and dTEC bending corrections, which were modelled at the observation level based, in part, on parameters from the International Reference Ionosphere 2007 model. Combined, the two bending corrections appear to have a minimal effect on site coordinates and ZTDs except for low latitude sites. Considering five days (DOY 301–305, 28 October–1 November 2001) near ionospheric maximum in detail, they affect mean ZTDs by up to ~1.7 mm at low latitudes, reducing to negligible levels at high latitudes. Examining the effect on coordinates in terms of power-spectra revealed the difference to be almost entirely white noise, with noise amplitude ranging from 0.3 mm (high latitudes) to 2.4 mm (low latitudes). The limited effect on station coordinates is probably due to the similarity in the elevation dependence of the bending term with that of tropospheric mapping functions. The smoothed z-translation from the GPS reference frame to ITRF2005 changes by less than 2 mm, though the effect combines positively with that from the second order ionospheric refractive index term. We conclude that, at the present time, and for most practical purposes, the geometric and dTEC bending corrections are probably negligible at current GPS/reference frame precisions. Numéro de notice : A2010-440 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-010-0386-2 Date de publication en ligne : 01/06/2010 En ligne : https://doi.org/10.1007/s00190-010-0386-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30633
in Journal of geodesy > vol 84 n° 8 (August 2010) . - pp 491 - 499[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2010081 SL Revue Centre de documentation Revues en salle Disponible Aviation grade : New GPS signals, chips off the block IIF / R.E. Phelts in Inside GNSS, vol 5 n° 5 (July - August 2010)
PermalinkGLONASS CDMA: Some proposals on signal formats for future GNSS air interface / V. Ipatov in Inside GNSS, vol 5 n° 5 (July - August 2010)
PermalinkInteger least-squares theory for the GNSS compass / Peter J.G. Teunissen in Journal of geodesy, vol 84 n° 7 (July 2010)
PermalinkContributions of the French Institut Géographique National (IGN) to the International DORIS Service / Pascal Willis in Advances in space research, vol 45 n° 12 (15/06/2010)
PermalinkThe crustal dynamics data information system: a resource to support scientific analysis using space geodesy / Carey E. Noll in Advances in space research, vol 45 n° 12 (15/06/2010)
PermalinkThe international DORIS service (IDS): toward maturity / Pascal Willis in Advances in space research, vol 45 n° 12 (15/06/2010)
PermalinkAnalyse des séries temporelles SLR du géocentre et des EOP basées sur les mesures des satellites LAGEOS1/2 et Starlette / Bachir Gourine in Bulletin des sciences géographiques, n° 25 (juin 2010)
PermalinkAssessing the accuracy of GEOID03 and GEOID09 in Connecticut / Thomas H. Meyer in SaLIS Surveying and land information science, vol 70 n° 2 (Summer 2010)
PermalinkPermalinkGPS, GLONASS, and more: multiple constellation processing in the International GNSS Service / Tim A. Springer in GPS world, vol 21 n° 6 (June 2010)
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