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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]

Evaluation of quad-constellation GNSS precise point positioning in Egypt / Emad El Manaily in Artificial satellites, vol 52 n° 1 (March 2017)  

Public [article]  inArtificial satellites > vol 52 n° 1 (March 2017) . - pp 9 - Titre : Evaluation of quad-constellation GNSS precise point positioning in Egypt Type de document : Article/Communication Auteurs : Emad El Manaily, Auteur ; Mahmoud Abd Rabbou, Auteur ; Adel El-Shazly, Auteur ; Moustafa Baraka, Auteur Année de publication : 2017 Article en page(s) : pp 9 - Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] Alexandrie [Termes IGN] Assouan [Termes IGN] Le Caire [Termes IGN] positionnement par BeiDou [Termes IGN] positionnement par Galileo [Termes IGN] positionnement par GNSS [Termes IGN] positionnement ponctuel précis [Termes IGN] zone urbaine Résumé : (auteur) Commonly, relative GPS positioning technique is used in Egypt for precise positioning applications. However, the requirement of a reference station is usually problematic for some applications as it limits the operational range of the system and increases the system cost and complexity. On the other hand, the single point positioning is traditionally used for low accuracy applications such as land vehicle navigation with positioning accuracy up to 10 meters in some scenarios which caused navigation problems especially in downtown areas. Recently, high positioning accuracy can be obtained through Precise Point Positioning (PPP) technique in which only once GNSS receiver is used. However, the major drawback of PPP is the long convergence time to reach to the surveying grade accuracy compared to the existing relative techniques. Moreover, the PPP accuracy is significantly degraded due to shortage in satellite availability in urban areas. To overcome these limitations, the quad constellation GNSS systems namely GPS, GLONASS, Galileo and BeiDou can be combined to increase the satellite availability and enhance the satellite geometry which in turn reduces the convergence time. In Egypt, at the moment, the signals of both Galileo and BeiDou could be logged with limited number of satellites up to four and six satellites for both Systems respectively. In this paper, we investigated the performance of the Quad-GNSS positioning in both dual- and single-frequency ionosphere free PPP modes for both high accurate and low cost navigation application, respectively. The performance of the developed PPP models will be investigated through GNSS data sets collected at three Egyptian cities namely, Cairo, Alexandria and Aswan. Numéro de notice : A2017-268 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1515/arsa-2017-0002 En ligne : https://doi.org/10.1515/arsa-2017-0002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85292 [article]

Aswan high dam / Sadd el aali authority (1964)

Public Titre : Aswan high dam : diversion of Nile Type de document : Monographie Auteurs : Sadd el aali authority, Auteur ; Aswan high dam authority, Auteur Editeur : Le Caire : Aswan High Dam Authority Année de publication : 1964 Importance : 76 p. Format : 22 x 23 cm Langues : Français (fre) Descripteur : [Vedettes matières IGN] Géographie mondiale [Termes IGN] Assouan [Termes IGN] barrage [Termes IGN] canal [Termes IGN] Egypte [Termes IGN] Le Caire [Termes IGN] tunnel Numéro de notice : 46310 Affiliation des auteurs : non IGN Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=58500

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
46310-01	60.12	Livre	Centre de documentation	En réserve M-103	Disponible

Egypte - Palestine / M.T. Gadala (1932)

Public Titre : Egypte - Palestine : du sphinx à la croix Type de document : Roman/Récit Auteurs : M.T. Gadala, Auteur Editeur : Paris, Grenoble : Arthaud Année de publication : 1932 Importance : 190 p. Format : 17 x 23 cm Langues : Français (fre) Descripteur : [Vedettes matières IGN] Géographie mondiale [Termes IGN] Assouan [Termes IGN] Egypte [Termes IGN] Jérusalem [Termes IGN] Le Caire [Termes IGN] Palestine [Termes IGN] Thèbes (Egypte antique) Numéro de notice : 26150 Affiliation des auteurs : non IGN Nature : Roman / récit Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=42005

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
26150-01	160.12	Livre	Centre de documentation	En réserve L-101	Fonds ancien - consultable sur RdV Exclu du prêt