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Airborne kinematic positioning using precise point positioning methodology / Yang Gao in Geomatica, vol 59 n° 1 (January 2005)  

Public [article]  inGeomatica > vol 59 n° 1 (January 2005) . - pp 29 - 36 Titre : Airborne kinematic positioning using precise point positioning methodology Type de document : Article/Communication Auteurs : Yang Gao, Auteur ; A. Wojciechowski, Auteur Année de publication : 2005 Article en page(s) : pp 29 - 36 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] analyse comparative [Termes IGN] GPS en mode cinématique [Termes IGN] GPS en mode différentiel [Termes IGN] instrument aéroporté [Termes IGN] international GPS service for geodynamics [Termes IGN] positionnement cinématique [Termes IGN] positionnement différentiel [Termes IGN] positionnement ponctuel précis [Termes IGN] précision centimétrique [Termes IGN] précision de localisation Résumé : (Auteur) Currently, high precision kinematic GPS positioning with centimetre-level accuracy can only be carried out using a differential GPS (DGPS) positioning approach which requires the deployment of a GPS receiver at each base station. The DGPS approach, spatially limits the operating range of the rover receiver to about 20 km from the base stations. As a result, it increases not only the operational cost of equipment and human resources but also the logistical complexity of many applications such as land and geodetic surveying, and airborne mapping. With the increased availabiliiy of precise GPS satellite orbit and clock data with reduced latency from the International GPS Service (IGS) and many other organizations, high precision kinematic at centimetre to decimetre-level is now possible using a single GPS receiver. This paper describes a method known as precise point positioning and its application to airborne kinematic positioning. Different from the conventional DGPS approach, the new method does not need a base station since the positioning determination is based on the processing of un-differenced code and carrier-phase observations from a single GPS receiver. It therefore eliminates the dependency on base station and the rover range limitation associated with conventional methods, resulting in instant advantages in field operations. A software system that has been developed at the University of Calgary will also be described in this paper along with numerical results to demonstrate the positioning accuracy obtainable. Numéro de notice : A2005-240 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.5623/geomat-2005-0005 En ligne : https://doi.org/10.5623/geomat-2005-0005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27377 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
035-05011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Collocation-based multiple reference station positioning using the covariance of the corrections / P. Alves in Geomatica, vol 59 n° 1 (January 2005)  

Public [article]  inGeomatica > vol 59 n° 1 (January 2005) . - pp 37 - 47 Titre : Collocation-based multiple reference station positioning using the covariance of the corrections Type de document : Article/Communication Auteurs : P. Alves, Auteur ; Gérard Lachapelle, Auteur ; M.E. Cannon, Auteur Année de publication : 2005 Article en page(s) : pp 37 - 47 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] Alberta (Canada) [Termes IGN] collocation par moindres carrés [Termes IGN] correction atmosphérique [Termes IGN] correction du signal [Termes IGN] covariance [Termes IGN] positionnement cinématique en temps réel [Termes IGN] positionnement différentiel [Termes IGN] réfraction atmosphérique [Termes IGN] réseau géodésique local [Termes IGN] restitution d'orbite [Termes IGN] station de référence Résumé : (Auteur) The multiple reference station approach is a method of integrating the information from multiple near-reference stations to further improve precise carrier-phase positioning relative to the traditional single reference station approach. Network RTK uses data from a network of reference stations to model the corelated atmospheric and orbital errors to predict the errors at the location of a rover within the network. One method for predicting the errors is using least squares collocation. Multiple reference station positioning is currently somewhat limited due to the processing options of off-the-shelf receivers. Network RTK corrections are converted into a single reference station corrections format so that a roving receiver can interpret them. Due to this limitation, focus has been on calculating the value of the corrections and ignoring any stochastic information because it could not be used. This paper examines the performance of the collocation-based multiple reference station approach using both the value and estimated variance-covariance of the correction. Tests on the Southern Alberta Network, Canada, show that this approach reduces L1 and L2 carrier-phase -measurement residuals by 13 to 35 percent and 3D position errors by 16 to 35 percent. Numéro de notice : A2005-241 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.5623/geomat-2005-0006 En ligne : https://doi.org/10.5623/geomat-2005-0006 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27378 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
035-05011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Using GPS for augmenting deformation monitoring systems in open pit mines: problems and solutions / J. Bond in Geomatica, vol 59 n° 1 (January 2005)  

Public [article]  inGeomatica > vol 59 n° 1 (January 2005) . - pp 73 - 82 Titre : Using GPS for augmenting deformation monitoring systems in open pit mines: problems and solutions Type de document : Article/Communication Auteurs : J. Bond, Auteur ; A. Chrzanowski, Auteur ; et al., Auteur Année de publication : 2005 Article en page(s) : pp 73 - 82 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] déformation de la croute terrestre [Termes IGN] détection de cible [Termes IGN] mine [Termes IGN] positionnement par GPS [Termes IGN] précision millimétrique [Termes IGN] surveillance géologique [Termes IGN] tachéomètre électronique Résumé : (Auteur) Large open pit mines require continuous monitoring of the stability of the bench walls. In most cases, sub-centimetre accuracy at the 95% confidence level is required in displacement detection of hundreds of targets. Presently, robotic total stations (RTSs) with automatic target recognition provide the most efficient solution for the monitoring problem. In large open pit mines it may be necessary to place the RTS near the bottom of the pit in unstable conditions without visibility to stable reference points. Extensive testing has been performed in a large open pit mine to evaluate the use of GPS in controlling the stability of the RTSs. The goal was to achieve GPS corrections to the position of RTSs with a standard deviation of Numéro de notice : A2005-242 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.5623/geomat-2005-0009 En ligne : https://doi.org/10.5623/geomat-2005-0009 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27379 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
035-05011	RAB	Revue	Centre de documentation	En réserve L003	Disponible