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GNSS RF Compatibility assessment: Interference among GPS, Galileo and Compass / W. Liu in GPS world, vol 21 n° 12 (December 2010)
[article]
Titre : GNSS RF Compatibility assessment: Interference among GPS, Galileo and Compass Type de document : Article/Communication Auteurs : W. Liu, Auteur ; X. Zhan, Auteur ; L. Liu, Auteur ; M. Niu, Auteur Année de publication : 2010 Article en page(s) : pp 32 - 40 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] compatibilité
[Termes IGN] configuration (matériel informatique)
[Termes IGN] dégradation du signal
[Termes IGN] géonavigateur
[Termes IGN] interférence
[Termes IGN] rapport signal sur bruit
[Termes IGN] récepteur GNSS
[Termes IGN] récepteur mixte
[Termes IGN] signal BeiDou
[Termes IGN] signal Galileo
[Termes IGN] signal GNSS
[Termes IGN] signal GPSRésumé : (Auteur) A comprehensive methodology combines spectral-separation and code-tracking spectral-sensitivity coefficients to analyze interference among GPS, Galileo, and Compass. The authors propose determining the minimum acceptable degradation of effective carrier-to-noise-density ratio, considering all receiver processing phases, and conclude that each GNSS can provide a sound basis for compatibility with other GNSS with respect to the special receiver configuration. Numéro de notice : A2010-540 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30732
in GPS world > vol 21 n° 12 (December 2010) . - pp 32 - 40[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-2010121 RAB Revue Centre de documentation En réserve L003 Disponible Record, Replay, Rewind : Testing GNSS Receivers with Record and Playback Techniques / D. Hall in GPS world, vol 21 n° 10 (October 2010)
[article]
Titre : Record, Replay, Rewind : Testing GNSS Receivers with Record and Playback Techniques Type de document : Article/Communication Auteurs : D. Hall, Auteur Année de publication : 2010 Article en page(s) : pp 28 - 34 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] antenne GNSS
[Termes IGN] positionnement par GNSS
[Termes IGN] radiofréquence
[Termes IGN] récepteur GNSS
[Termes IGN] signal GLONASS
[Termes IGN] signal GPS
[Termes IGN] test de performanceRésumé : (Auteur) Is there a way to perform repeatable tests on GNSS receivers using real signals? This month’s column looks at how to use an RF vector signal analyzer to digitize and record live signals, and then play them back to a GNSS receiver with an RF vector signal generator. Numéro de notice : A2010-481 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30674
in GPS world > vol 21 n° 10 (October 2010) . - pp 28 - 34[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-2010101 RAB Revue Centre de documentation En réserve L003 Disponible Friendly reflections: monitoring water level with GNSS / A. Egido in GPS world, vol 21 n° 9 (September 2010)
[article]
Titre : Friendly reflections: monitoring water level with GNSS Type de document : Article/Communication Auteurs : A. Egido, Auteur ; M. Caparrini, Auteur Année de publication : 2010 Article en page(s) : pp 50 - 55 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] diffusion du rayonnement
[Termes IGN] hydrographie de surface
[Termes IGN] niveau de l'eau
[Termes IGN] récepteur GNSS
[Termes IGN] réflectométrie par GNSSRésumé : (Editeur) Why is the sky blue? This is an age-old question, interesting to anyone with a curiosity about his or her surroundings. But what has it got to do with global navigation satellite systems? Believe it or not, there is a connection.
Some of you might remember the explanation of the sky’s color from your Physics 101 course but to bring everyone up to the same level, let’s review. Everything we see is the result of the interaction of light and matter. And by matter, we mean the atoms, molecules, and particles making up matter. Light causes matter to vibrate. And vibrating matter (due to its electrical charges) in turn emits light, which combines with the original light. But matter not only re-emits light in the forward direction, it re-emits light in all other directions. This is called scattering.
Now, the light from the sun includes all colors and so if look directly at the sun when it is high in the sky (don’t try this at home), it looks white or slightly yellowish. We are seeing the light propagating directly toward our eyes. When we look at the sky away from the sun, we are seeing scattered light. And this scattered light is predominantly blue. Why? It turns out that scattering is proportional to the fourth power of frequency. Light that is of a higher frequency, say a factor of two, is sixteen times more intensely scattered. So, blue light, which has about twice the frequency of light from the red end of the visible spectrum, is scattered much more than red light. Violet light is scattered even more but our eyes are not as sensitive to violet light as they are to blue light. Hence the sky looks blue.
So what has this got to do with GNSS? As we know, for the best positioning and navigation results, we need the satellite signals to travel along a direct path to the receiver’s antenna. There may be slight changes in the speed and direction of propagation of these direct-path signals caused by the interaction of the electromagnetic waves with the matter making up the ionosphere and the neutral atmosphere, but these are readily accounted for in the position fixes.
However, once they reach the Earth’s surface, the signals can be reflected by buildings, vegetation, the ground, water surfaces, and so on. The signals are actually being scattered by the matter they encounter. A receiver can selectively acquire the scattered signals and the resulting measurements can be interpreted to reveal certain characteristics of the source of the scattering.
In this month’s column, we learn about the design and application of a GNSS instrument that uses scattered signals for monitoring the level and roughness of inland and coastal water surfaces–yet one more use of GNSS signals for the betterment of planet Earth.Numéro de notice : A2010-375 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30569
in GPS world > vol 21 n° 9 (September 2010) . - pp 50 - 55[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-2010091 RAB Revue Centre de documentation En réserve L003 Disponible Level Crossing Rate Estimation (LCRE): a new technique for finding GNSS carrier-to-noise ratios / Elena Simona Lohan in Inside GNSS, vol 5 n° 6 (September 2010)
[article]
Titre : Level Crossing Rate Estimation (LCRE): a new technique for finding GNSS carrier-to-noise ratios Type de document : Article/Communication Auteurs : Elena Simona Lohan, Auteur ; D. Skournetou, Auteur Année de publication : 2010 Article en page(s) : 10 p. ; pp 36 - 47 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] phase GNSS
[Termes IGN] rapport signal sur bruit
[Termes IGN] récepteur GNSSRésumé : (Auteur) The authors propose a new carrier-to-noise ratio (CNR) estimation method - an important metric in GNSS receiver operation - based on use of the level crossing rate of a receiver’s correlation function. Numéro de notice : A2010-673 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33455
in Inside GNSS > vol 5 n° 6 (September 2010) . - 10 p. ; pp 36 - 47[article]Documents numériques
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Level Crossing Rate Estimation ... - scanAdobe Acrobat PDF Spoofing detection and mitigation with a moving handheld receiver / J. Nielsen in GPS world, vol 21 n° 9 (September 2010)
[article]
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 [Testing multi-GNSS equipment part 2] GNSS simulators: Everything you wanted to know ... but were afraid to ask / I. Petrovski in Inside GNSS, vol 5 n° 6 (September 2010)PermalinkTesting multi-GNSS equipment: systems, simulators and the production pyramid [part 1] / I. Petrovski in Inside GNSS, vol 5 n° 5 (July - August 2010)PermalinkGPS, GLONASS, and more: multiple constellation processing in the International GNSS Service / Tim A. Springer in GPS world, vol 21 n° 6 (June 2010)PermalinkThe GPS assimilator: Upgrading receivers via benign spoofing / T. Humphreys in Inside GNSS, vol 5 n° 4 (June 2010)PermalinkGALILEO test user receiver: status, key results, performance / A. Van Den Berg in GPS world, vol 21 n° 4 (April 2010)PermalinkReady to navigate: a methodology for the estimation of the time-to-first-fix / M. Anghileri in Inside GNSS, vol 5 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)PermalinkDévelopper avec les API Google maps / F. Goblet (2010)PermalinkNavigation Signal Processing for GNSS Software Receivers / T. Pany (2010)PermalinkPermalink