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Mitigating the impact of ionospheric cycle slips in GNSS observations / Simon Banville in Journal of geodesy, vol 87 n° 2 (February 2013)  

Public [article]  inJournal of geodesy > vol 87 n° 2 (February 2013) . - pp 179 - 193 Titre : Mitigating the impact of ionospheric cycle slips in GNSS observations Type de document : Article/Communication Auteurs : Simon Banville, Auteur ; R. Langley, Auteur Année de publication : 2013 Article en page(s) : pp 179 - 193 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] Canada [Termes IGN] données GNSS [Termes IGN] positionnement ponctuel précis [Termes IGN] propagation ionosphérique [Termes IGN] scintillation [Termes IGN] traitement de données GNSS Résumé : (Auteur) Processing of data from global navigation satellite systems (GNSS), such as GPS, GLONASS and Galileo, can be considerably impeded by disturbances in the ionosphere. Cycle-slip detection and correction thus becomes a crucial component of robust software. Still, dealing with ionospheric cycle slips is not trivial due to scintillation effects in both the phase and the amplitude of the signals. In this contribution, a geometry-based approach with rigorous handling of the ionosphere is presented. A detailed analysis of the cycle-slip correction process is also tackled by examining its dependence on phase and code noise, non-dispersive effects and, of course, the ionosphere. The importance of stochastic modeling in validating the integer cycle-slip candidates is emphasized and illustrated through simulations. By examining the relationship between ionospheric bias and ionospheric constraint, it is shown that there is a limit in the magnitude of ionospheric delay variation that can be handled by the cycle-slip correction process. Those concepts are applied to GNSS data collected by stations in northern Canada, and show that enhanced cycle-slip detection can lead to decimeter-level improvements in the accuracy of kinematic PPP solutions with a 30-s sampling interval. Cycle-slip correction associated with ionospheric delay variations exceeding 50 cm is also demonstrated, although there are risks with such a procedure and these are pointed out. Numéro de notice : A2013-100 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-012-0604-1 Date de publication en ligne : 04/11/2012 En ligne : https://doi.org/10.1007/s00190-012-0604-1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32238 [article]

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Galileo IOV-3 broadcasts E1, E5, E6 signals / Oliver Montenbruck in GPS world, vol 24 n° 1 (January 2013)

Public [article]  inGPS world > vol 24 n° 1 (January 2013) . - pp 18 - 27 Titre : Galileo IOV-3 broadcasts E1, E5, E6 signals Type de document : Article/Communication Auteurs : Oliver Montenbruck, Auteur ; R. Langley, Auteur Année de publication : 2013 Article en page(s) : pp 18 - 27 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] ionosphère [Termes IGN] phase [Termes IGN] signal Galileo Résumé : (documentaliste) Le satellite IOV-3 de Galiléo a commencé à émettre son signal. Numéro de notice : A2013-025 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32163 [article]

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Multipath minimization method: mitigation through adaptive filtering for machine automation applications / L. Serrano in GPS world, vol 22 n° 7 (July 2011)

Public [article]  inGPS world > vol 22 n° 7 (July 2011) . - pp 42 - 48 Titre : Multipath minimization method: mitigation through adaptive filtering for machine automation applications Type de document : Article/Communication Auteurs : L. Serrano, Auteur ; D. Kim, Auteur ; R. Langley, Auteur Année de publication : 2011 Article en page(s) : pp 42 - 48 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal [Termes IGN] antenne GNSS [Termes IGN] appariement de formes [Termes IGN] filtrage du rayonnement [Termes IGN] guidage de véhicules [Termes IGN] phase GPS [Termes IGN] trajet multiple Résumé : (Auteur) [...] The best way to reduce the effects of multipath is to try avoiding it in the first place by siting the receiver's antenna as low as possible and far away from potential reflectors. But that's not always feasible. [...] At a static site, with an unchanging multipath environment, the signal reflection geometry repeats day to day and the effect of multipath can be reduced by sidereal filtering or "stacking" of coordinate or carrier-phase-residual time series. However, this approach is not viable for scenarios where the receiver and antenna are moving such as in machine control applications. Here an alternative approach is needed. In this month's column, I am joined by two of my UNB colleagues as we look at a technique that uses a pair of antennas on a moving vehicle together with a sophisticated mathematical model, to reduce the level of multipath on carrier-phase observations and thereby improve the accuracy of the vehicle's position. Numéro de notice : A2011-326 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31105 [article]

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The SVN49 pseudorange error / R. Langley in GPS world, vol 20 n° 8 (August 2009)

Public [article]  inGPS world > vol 20 n° 8 (August 2009) . - pp 8 - 12 Titre : The SVN49 pseudorange error Type de document : Article/Communication Auteurs : R. Langley, Auteur Année de publication : 2009 Article en page(s) : pp 8 - 12 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] erreur de mesure [Termes IGN] mesurage de pseudo-distance [Termes IGN] signal GPS Résumé : (Auteur) Not expected was the effect of the L5 filter and its associated cable run on the L1 and L2 signals. Copyright Questex Media Group Numéro de notice : A2009-307 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29937 [article]

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Where is GIOVE-A exactly? Using microwaves and laser ranging for precise orbit determination / Erik Schönemann in GPS world, vol 20 n° 7 (July 2009)

Public [article]  inGPS world > vol 20 n° 7 (July 2009) . - pp 42 - 50 Titre : Where is GIOVE-A exactly? Using microwaves and laser ranging for precise orbit determination Type de document : Article/Communication Auteurs : Erik Schönemann, Auteur ; Tim A. Springer, Auteur ; R. Langley, Auteur ; et al., Auteur Année de publication : 2009 Article en page(s) : pp 42 - 50 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] constellation Galileo [Termes IGN] GIOVE (satellite) [Termes IGN] orbitographie [Termes IGN] télémétrie laser sur satellite Résumé : (Auteur) We use them for listening to music, for routine surgeries, for making a point in a presentation, and even for hanging pictures straight. Of course, I'm talking about lasers. Invented in 1960, the laser (an acronym for light amplification by the stimulated emission of radiation) has become ubiquitous in modem society. Every CD and DVD player has one. Many printers use them. But lasers are also used in a wide range of industrial and scientific applications including determining the orbits of satellites through satellite laser ranging (SLR). In the SLR technique, pulses of laser light from a ground reference station are directed at satellites equipped with an array of coner-cube retroreflectors, which direct the pulses back towards a collocated receiving, telescope. By accurately measuring the two-way travel times of the pulses and knowing location of the station and other operating parameters, the positions of the satellites can be determined. A network of SLR reference stations around the globe is used to monitor the orbits of satellites over time and their variations have been used by scientists to improve our knowledge of the Earth's gravity field ; to study the long term dynamics of the solid Earth, oceans, and atmosphere; and even to verify predictions of the General Theory of Relativity. The first SLR measurements were obtained from the Beacon Explorer-B satellite which launched in october 1964. Since then, dozens of satellite equipped with corner-cube retroreflectors have been launched including a number of radio-navigation satellites. Every GLONASS satellite is equipped with retroreflectors and two GPS satellite have been equipped - SVN35/PRN05 and SVN36/PNR06. The COMPASS-M1 satellite in medium earth orbit carries retroreflectors, as do both GIOVE-A and -B, the Galileo test satellites. Precise orbit determination of radio-navigation satellites using SLR has the advantage of being unaffected by any onboard satellite electronics and associated signal biases. Radiometric observations of a satellite's microwave signals, on the other hand, are influenced by the satellite's clock, for example, and its effect must be estimated to obtain precise (and accurate) satellite orbits for navigation and positioning. Therefore, a comparison of SLR-and microwave derived orbits can be very useful for studying the performance of the data measurement and orbit-determination processes of both techniques. In this month's column, we take a look at some work being carried out to precisely determine the orbit of the GIOVE-A test satellite using SLR and microwave observations. This preliminary investigation will benefit the procedures to be implemented for the future Galileo constellation. Copyright Questex Media Group Numéro de notice : A2009-282 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29912 [article]

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