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positionnement différentielSynonyme(s)positionnement relatif ;localisation relative navigation différentielleVoir aussi |
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New results in airborne vector gravimetry using strapdown INS/DGPS / M. Senobari in Journal of geodesy, vol 84 n° 5 (May 2010)
[article]
Titre : New results in airborne vector gravimetry using strapdown INS/DGPS Type de document : Article/Communication Auteurs : M. Senobari, Auteur Année de publication : 2010 Article en page(s) : pp 277 - 291 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] estimation statistique
[Termes IGN] GPS en mode différentiel
[Termes IGN] GPS-INS
[Termes IGN] gravimétrie aérienneRésumé : (Auteur) A method for airborne vector gravimetry has been developed. The method is based on developing the error dynamics equations of the INS in the inertial frame where the INS system errors are estimated in a wave estimator using inertial GPS position as update. Then using the error-corrected INS acceleration and the GPS acceleration in the inertial frame, the gravity disturbance vector is extracted. In the paper, the focus is on the improvement of accuracy for the horizontal components of the airborne gravity vector. This is achieved by using a decoupled model in the wave estimator and decorrelating the gravity disturbance from the INS system errors through the estimation process. The results of this method on the real strapdown INS/DGPS data are promising. The internal accuracy of the horizontal components of the estimated gravity disturbance for repeated airborne lines is comparable with the accuracy of the down component and is about 4–8 mGal. Better accuracy (2–4 mGal) is achieved after applying a wave-number correlation filter (WCF) to the parallel lines of the estimated airborne gravity disturbances. Numéro de notice : A2010-181 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-010-0366-6 Date de publication en ligne : 01/03/2010 En ligne : https://doi.org/10.1007/s00190-010-0366-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30376
in Journal of geodesy > vol 84 n° 5 (May 2010) . - pp 277 - 291[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 266-2010051 SL Revue Centre de documentation Revues en salle Disponible Single receiver phase ambiguity resolution with GPS data / Willy I. Bertiger in Journal of geodesy, vol 84 n° 5 (May 2010)
[article]
Titre : Single receiver phase ambiguity resolution with GPS data Type de document : Article/Communication Auteurs : Willy I. Bertiger, Auteur ; Shailen Desai, Auteur ; Bruce J. Haines, Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : pp 327 - 337 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] données GPS
[Termes IGN] GIPSY-OASIS
[Termes IGN] mesurage de phase
[Termes IGN] phase GPS
[Termes IGN] positionnement cinématique
[Termes IGN] positionnement par GPS
[Termes IGN] positionnement ponctuel précis
[Termes IGN] positionnement statique
[Termes IGN] résolution d'ambiguïté
[Termes IGN] traitement de données GNSSRésumé : (Auteur) Global positioning system (GPS) data processing algorithms typically improve positioning solution accuracy by fixing double-differenced phase bias ambiguities to integer values. These “double-difference ambiguity resolution” methods usually invoke linear combinations of GPS carrier phase bias estimates from pairs of transmitters and pairs of receivers, and traditionally require simultaneous measurements from at least two receivers. However, many GPS users point position a single local receiver, based on publicly available solutions for GPS orbits and clocks. These users cannot form double differences. We present an ambiguity resolution algorithm that improves solution accuracy for single receiver point-positioning users. The algorithm processes dual- frequency GPS data from a single receiver together with wide-lane and phase bias estimates from the global network of GPS receivers that were used to generate the orbit and clock solutions for the GPS satellites. We constrain (rather than fix) linear combinations of local phase biases to improve compatibility with global phase bias estimates. For this precise point positioning, no other receiver data are required. When tested, our algorithm significantly improved repeatability of daily estimates of ground receiver positions, most notably in the east component by approximately 30% with respect to the nominal case wherein the carrier biases are estimated as real values. In this “static” test for terrestrial receiver positions, we achieved daily repeatability of 1.9, 2.1 and 6.0 mm in the east, north and vertical (ENV) components, respectively. For kinematic solutions, ENV repeatability is 7.7, 8.4, and 11.7 mm, respectively, representing improvements of 22, 8, and 14% with respect to the nominal. Results from precise orbit determination of the twin GRACE satellites demonstrated that the inter-satellite baseline accuracy improved by a factor of three, from 6 to 2 mm up to a long-term bias. Jason-2/Ocean Surface Topography Mission precise orbit determination tests results implied radial orbit accuracy significantly below the 10 mm level. Stability of time transfer, in low-Earth orbit, improved from 40 to 7 ps. We produced these results by applying this algorithm within the Jet Propulsion Laboratory’s (JPL’s) GIPSY/OASIS software package and using JPL’s orbit and clock products for the GPS constellation. These products now include a record of the wide-lane and phase bias estimates from the underlying global network of GPS stations. This implies that all GIPSY–OASIS positioning users can now benefit from this capability to perform single-receiver ambiguity resolution. Numéro de notice : A2010-185 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-010-0371-9 Date de publication en ligne : 21/03/2010 En ligne : https://doi.org/10.1007/s00190-010-0371-9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30380
in Journal of geodesy > vol 84 n° 5 (May 2010) . - pp 327 - 337[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 266-2010051 SL Revue Centre de documentation Revues en salle Disponible Real-time adjustment underwater positioning system for submarines / W. Cheng in Marine geodesy, vol 33 n° 2-3 (April - September 2010)
[article]
Titre : Real-time adjustment underwater positioning system for submarines Type de document : Article/Communication Auteurs : W. Cheng, Auteur ; J. Jhou, Auteur Année de publication : 2010 Article en page(s) : pp 117 - 134 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] compensation
[Termes IGN] ligne de base
[Termes IGN] modèle géométrique
[Termes IGN] modèle numérique de terrain
[Termes IGN] onde acoustique
[Termes IGN] positionnement cinématique en temps réel
[Termes IGN] relief sous-marin
[Termes IGN] sous-marin
[Termes IGN] temps réel
[Termes IGN] traitement automatique de données
[Termes IGN] vitesseRésumé : (Auteur) A rapid real-time adjustment scheme is proposed for improving the precision of the conventional short-base line (SBL) positioning fix system used by submarines and other underwater vehicles. In the proposed approach, an initial position estimate is obtained by solving the conventional SBL tracking equations of the submarine given the assumptions of a constant speed of sound in water and a straight-line propagation path. In the first stage of the real-time adjustment procedure, this initial estimate is corrected using an iterative computation scheme based on a 3D geometry model. The improved position estimate is then used to compute a new, more accurate value of the speed of sound in water. Finally, in the second stage of the real-time adjustment procedure, the corrected speed of sound in water and the discrepancy between the original and corrected position estimates obtained in the first adjustment procedure are applied to update the coordinates of the submarine based on the second signal received from the pinger. The numerical results show that the proposed real-time adjustment system yields a significant improvement in the accuracy of the positioning fix estimates compared to those obtained from the conventional SBL method or the SBL method with the first adjustment procedure only. Numéro de notice : A2010-555 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/01490419.2010.492279 Date de publication en ligne : 16/05/2011 En ligne : https://doi.org/10.1080/01490419.2010.492279 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30747
in Marine geodesy > vol 33 n° 2-3 (April - September 2010) . - pp 117 - 134[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 230-2010021 RAB Revue Centre de documentation En réserve L003 Disponible Real-time registration of airborne laser with sub-decimeter accuracy / Jan Skaloud in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 2 (March - April 2010)
[article]
Titre : Real-time registration of airborne laser with sub-decimeter accuracy Type de document : Article/Communication Auteurs : Jan Skaloud, Auteur ; Philipp Schaer, Auteur ; P. Tome, Auteur ; Yannick Stebler, Auteur Année de publication : 2010 Article en page(s) : pp 208 - 217 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] covariance
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] GPS en mode différentiel
[Termes IGN] GPS-INS
[Termes IGN] lasergrammétrie
[Termes IGN] mesurage de phase
[Termes IGN] positionnement cinématique en temps réel
[Termes IGN] précision absolue
[Termes IGN] précision décimétrique
[Termes IGN] précision du positionnement
[Termes IGN] semis de points
[Termes IGN] télémétrie laser aéroporté
[Termes IGN] temps réelRésumé : (Auteur) This paper presents a methodology for the precise registering of airborne laser data directly in flight with an accuracy that is sufficient for the majority of derived products, such as digital terrain models. We first present the strategy that integrates GPS/INS/LiDAR data for generating laser point clouds directly in flight and analyzes their accuracy. The latter requires the implementation of a functional covariance propagation on-line for all the system components (i.e. trajectory, laser, system calibration) to which influences of scanning geometry are added at the end of a flight line. The study of scanning geometry necessitates the classification of vegetation and coarse estimation of the terrain normal. This is achieved by a method that we formerly proposed for off-line quality analysis. The second part of the paper focuses on the positioning component. In high resolution scanning performed close to the terrain, the absolute accuracy of the resulting point cloud depends mainly on the quality of the trajectory which is related to the type of GPS solution (e.g. absolute positioning, DGPS, RTK). To reach sub-decimeter accuracy for the point cloud in the real-time, an RTK-GPS solution is needed. This requires the establishment of a communication link for the transmission of GPS corrections (or measurements). We analyze the usability of RTK-GPS/ALS acquired during several flights using different communication methods in the particular context of helicopter based missions. We focus mainly on the exploitation of nation-wide reference GNSS networks and confirm experimentally that the real-time registration of airborne laser data is feasible with sub-decimeter accuracy. Such quality is sufficient not only for a wide range of applications, but it also opens new opportunities for monitoring missions that require a short reaction time. Finally, we concentrate on situations when the phase and code corrections cannot be transmitted, and the quality of the differential carrier-phase positioning needs to be predicted. We validate the previously introduced indicators of positioning quality by simulated degradation of the input data. Copyright ISPRS Numéro de notice : A2010-093 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2009.12.003 En ligne : https://doi.org/10.1016/j.isprsjprs.2009.12.003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30289
in ISPRS Journal of photogrammetry and remote sensing > vol 65 n° 2 (March - April 2010) . - pp 208 - 217[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 081-2010021 SL Revue Centre de documentation Revues en salle Disponible Wide-area RTK: high precision positioning on a continental scale / Manuel Hernández-Pajares in Inside GNSS, vol 5 n° 2 (March - April 2010)
[article]
Titre : Wide-area RTK: high precision positioning on a continental scale Type de document : Article/Communication Auteurs : Manuel Hernández-Pajares, Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : 12 p. ; pp 35 - 46 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] atmosphère terrestre
[Termes IGN] correction du signal
[Termes IGN] modèle ionosphérique
[Termes IGN] positionnement cinématique en temps réel
[Termes IGN] propagation ionosphérique
[Termes IGN] récepteur GNSS
[Termes IGN] traitement de données GNSSRésumé : (Auteur) Real-time corrections at the decimeter level over an entire continent? The challenge lies in minimizing the ranging errors from signals propagating through the Earth’s atmosphere. European researchers describe how it can be done using a Wide Area Real-Time Kinematic concept that exploits the full geometry of the observations, a central processing facility, and undifferenced processing of measurements from widely space GNSS reference receivers to create a real-time ionospheric model of the signal slant delays. Copyright Gibbons Media & Research LLC Numéro de notice : A2010-619 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33569
in Inside GNSS > vol 5 n° 2 (March - April 2010) . - 12 p. ; pp 35 - 46[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 159-2010021 SL Revue Centre de documentation Revues en salle Disponible Documents numériques
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