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Kinematic-PPP using single/dual frequency observations from (GPS, GLONASS and GPS/GLONASS) constellations for hydrography / Ashraf Farah in Artificial satellites, vol 53 n° 1 (March 2018)  

Public [article]  inArtificial satellites > vol 53 n° 1 (March 2018) . - pp 37 - 46 Titre : Kinematic-PPP using single/dual frequency observations from (GPS, GLONASS and GPS/GLONASS) constellations for hydrography Type de document : Article/Communication Auteurs : Ashraf Farah, Auteur Année de publication : 2018 Article en page(s) : pp 37 - 46 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] Assouan [Termes IGN] données GLONASS [Termes IGN] données GPS [Termes IGN] Nil (fleuve) [Termes IGN] positionnement cinématique [Termes IGN] positionnement par GLONASS [Termes IGN] positionnement par GPS [Termes IGN] positionnement ponctuel précis [Termes IGN] récepteur bifréquence [Termes IGN] récepteur monofréquence Résumé : (auteur) Global Positioning System (GPS) technology is ideally suited for inshore and offshore positioning because of its high accuracy and the short observation time required for a position fix. Precise point positioning (PPP) is a technique used for position computation with a high accuracy using a single GNSS receiver. It relies on highly accurate satellite position and clock data that can be acquired from different sources such as the International GNSS Service (IGS). PPP precision varies based on positioning technique (static or kinematic), observations type (single or dual frequency) and the duration of observations among other factors. PPP offers comparable accuracy to differential GPS with safe in cost and time. For many years, PPP users depended on GPS (American system) which considered the solely reliable system. GLONASS's contribution in PPP techniques was limited due to fail in maintaining full constellation. Yet, GLONASS limited observations could be integrated into GPS-based PPP to improve availability and precision. As GLONASS reached its full constellation early 2013, there is a wide interest in PPP systems based on GLONASS only and independent of GPS. This paper investigates the performance of kinematic PPP solution for the hydrographic applications in the Nile river (Aswan, Egypt) based on GPS, GLONASS and GPS/GLONASS constellations. The study investigates also the effect of using two different observation types; single-frequency and dual frequency observations from the tested constellations. Numéro de notice : A2018-174 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.2478/arsa-2018-0004 Date de publication en ligne : 24/03/2018 En ligne : https://doi.org/10.2478/arsa-2018-0004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89814 [article]

Code single point positioning using nominal GNSS constellations (future perception) / Ashraf Farah in Artificial satellites. Planetary geodesy, vol 42 n° 3 (September 2007)    

Public [article]  inArtificial satellites. Planetary geodesy > vol 42 n° 3 (September 2007) . - pp 149 - 153 Titre : Code single point positioning using nominal GNSS constellations (future perception) Type de document : Article/Communication Auteurs : Ashraf Farah, Auteur Année de publication : 2007 Article en page(s) : pp 149 - 153 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] constellation Galileo [Termes IGN] constellation GLONASS [Termes IGN] constellation GPS [Termes IGN] positionnement ponctuel précis Résumé : (Auteur) Global Navigation Satellite Systems (GNSS) have an endless number of applications in industry, science, military, transportation and recreation & sports. Two systems are currently in operation namely GPS (the USA Global Positioning System) and GLONASS (the Russian GLObal NAvigation Satellite System), and a third is planned, the European satellite navigation system GALILEO. The potential performance improvements achievable through combining these systems could be significant and expectations are high. The need is inevitable to explore the future of positioning from different nominal constellations. In this research paper, Bernese 5.0 software could be modified to simulate and process GNSS observations from three different constellations (GPS, Glonass and Galileo) using different combinations. This study presents results of code single point positioning for five stations using the three constellations and different combinations. Copyright Artificial satellites Numéro de notice : A2007-648 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.2478/v10018-008-0007-y Date de publication en ligne : 23/06/2008 En ligne : https://doi.org/10.2478/v10018-008-0007-y Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28995 [article]

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