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Geolocation and pointing accuracy analysis for the WindSat sensor / W.E. Purdy in IEEE Transactions on geoscience and remote sensing, vol 44 n° 3 (March 2006)
[article]
Titre : Geolocation and pointing accuracy analysis for the WindSat sensor Type de document : Article/Communication Auteurs : W.E. Purdy, Auteur ; P.W. Gaiser, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 496 - 505 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] capteur spatial
[Termes IGN] erreur systématique
[Termes IGN] polarimétrie
[Termes IGN] précision du positionnement
[Termes IGN] radiométrie
[Termes IGN] WINDSATRésumé : (Auteur) Geolocation and pointing accuracy analyses of the WindSat flight data are presented. The two topics were inter-twined in the flight data analysis and will be addressed together. WindSat has no unusual geolocation requirements relative to other sensors, but its beam pointing knowledge accuracy is especially critical to support accurate polarimetric radiometry. Pointing accuracy was improved and verified using geolocation analysis in conjunction with scan bias analysis. Two methods were needed to properly identify and differentiate between data time tagging and pointing knowledge errors. Matchups comparing coastlines indicated in imagery data with their known geographic locations were used to identify geolocation errors. These coast-line matchups showed possible pointing errors with ambiguities as to the true source of the errors. Scan bias analysis of U, the third Stokes parameter, and of vertical and horizontal polarizations provided measurement of pointing offsets resolving ambiguities in the coastline matchup analysis. Several geolocation and pointing bias sources were incrementally eliminated resulting in pointing knowledge and geolocation accuracy that met all design requirements. Numéro de notice : A2006-136 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2005.858415 En ligne : https://doi.org/10.1109/TGRS.2005.858415 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27863
in IEEE Transactions on geoscience and remote sensing > vol 44 n° 3 (March 2006) . - pp 496 - 505[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-06031 RAB Revue Centre de documentation En réserve L003 Disponible GPS + modernized GPS + Galileo signal timing biases / C. Hegarty in GPS world, vol 17 n° 3 (March 2006)
[article]
Titre : GPS + modernized GPS + Galileo signal timing biases Type de document : Article/Communication Auteurs : C. Hegarty, Auteur ; E. Powers, Auteur ; B. Fonville, Auteur Année de publication : 2006 Article en page(s) : pp 49 - 54 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] analyse comparative
[Termes IGN] erreur systématique
[Termes IGN] fréquence
[Termes IGN] mesurage de pseudo-distance
[Termes IGN] polarisation
[Termes IGN] récepteur GPS
[Termes IGN] signal Galileo
[Termes IGN] signal GPS
[Termes IGN] système de positionnement par satellitesRésumé : (Editeur) GPS timing and navigation user solutions are based on pseudo-range measurements made by correlating user-receiver - generated replica signals broadcast by the GPS satellites. Any bias resulting from this correlation process within a user receiver tends to be common across all receiver channels when the signal characteristics - code type, modulation type and band-with - are identical. Such common biases will cancel out in the user navigation solution and appear as a fixed bias for timing solutions and some atmospheric signal analyses. New GPS signals and the future Galileo signals are somewhat different than the legacy signals broadcast by GPS satellites today, so new ways of accounting for biases will be needed. In this month's column, Chris Hegarty, Ed powers and Blair Fonville discuss this problem and quantify the timing biases of the different legacy and modernized GPS and Galileo signals broadcast on the L1 frequency and their dependencies on factors such as user-receiver filter band-with, filter transfer function and delay-locked loop correlator spacing. Numéro de notice : A2006-083 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27810
in GPS world > vol 17 n° 3 (March 2006) . - pp 49 - 54[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-06031 RAB Revue Centre de documentation En réserve L003 Disponible Corrections for cluster-plot slop / Harry T. Valentine in Forest science, vol 52 n° 1 (February 2006)
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Titre : Corrections for cluster-plot slop Type de document : Article/Communication Auteurs : Harry T. Valentine, Auteur ; Mark J. Ducey, Auteur ; Jeffrey H. Gove, Auteur ; Adrian Lanz, Auteur ; David L.R. Affleck, Auteur Année de publication : 2006 Article en page(s) : pp 55 - 66 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] erreur systématique
[Termes IGN] Etats-Unis
[Termes IGN] inventaire forestier (techniques et méthodes)
[Termes IGN] placette d'échantillonnage
[Vedettes matières IGN] Inventaire forestierRésumé : (auteur) Cluster-plot designs, including the design used by the Forest Inventory and Analysis program of the USDA Forest Service (FIA), are attended by a complicated boundary slopover problem. Slopover occurs where inclusion zones of objects of interest cross the boundary of the area of interest. The dispersed nature of inclusion zones that arise from the use of cluster plots precludes the use of most of the slopover-correction methods that apply to solitary plots. One exception is the walkthrough method, which corrects for slopover bias in radially symmetric cluster-plot designs. In this article, we provide a modification of the walkthrough method, the "walkabout method," which is applicable to some asymmetric cluster-plot designs, such as the one used by FIA. We also present two general correction methods, the "vectorwalk method" and the "reflection method," both of which are applicable to cluster-plot designs with satellite subplots assanged in a regular or irregular pattern. The reflection method has two sets of protocols, one that applies to radially symmetric designs and to asymmetric designs with random orientation; the other set applies to asymmetric designs with fixed orientation. Both the vectorwalk and reflection methods incorporate the walkthrough method on a subplot-by-subplot basis. All four methods correct for slopover bias for straight or curved boundaries, and where work outside the tract is impossible. Numéro de notice : A2006-663 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1093/forestscience/52.1.55 Date de publication en ligne : 01/01/2006 En ligne : https://doi.org/10.1093/forestscience/52.1.55 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89163
in Forest science > vol 52 n° 1 (February 2006) . - pp 55 - 66[article]Multi-technique comparison of tropospheric zenith delays derived during the CONT02 campaign / Pascal Willis in Journal of geodesy, vol 79 n° 10-11 (February 2006)
[article]
Titre : Multi-technique comparison of tropospheric zenith delays derived during the CONT02 campaign Type de document : Article/Communication Auteurs : Pascal Willis , Auteur ; K. Snajdrova, Auteur ; Johannes Böhm , Auteur ; Rüdiger Haas, Auteur Année de publication : 2006 Article en page(s) : pp 613 - 623 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] analyse comparative
[Termes IGN] distance zénithale
[Termes IGN] données WVR
[Termes IGN] écart type
[Termes IGN] erreur systématique
[Termes IGN] météorologie
[Termes IGN] positionnement par DORIS
[Termes IGN] positionnement par GPS
[Termes IGN] prévision météorologique
[Termes IGN] propagation troposphérique
[Termes IGN] traitement du signal
[Termes IGN] troposphèreRésumé : (Auteur) In October 2002, 15 continuous days of Very Long Baseline Interferometry (VLBI) data were observed in the Continuous VLBI 2002 (CONT02) campaign. All eight radio telescopes involved in CONT02 were co-located with at least one other space-geodetic technique, and three of them also with a Water Vapor Radiometer (WVR). The goal of this paper is to compare the tropospheric zenith delays observed during CONT02 by VLBI, Global Positioning System (GPS), Doppler Orbitography Radiopositioning Integrated by Satellite (DORIS) and WVR and te, compare them also with operational pressure level data from the European Centre for Medium-Range Weather Forecasts (ECMWF). We show that the tropospheric zenith delays from VLBI and GPS are in good agreement at the 3-7 mm level. However, while only small biases can be found for most of the stations, at Kokee Park (Hawaii, USA) and Westford (Massachusetts, USA) the zenith delays derived by GPS are larger by more than 5 mm than those from VLBI. At three of the four DORIS stations, there is also a fairly good agreement with GPS and VLBI (about 10 mm), but at Kokee Park the agreement is only at about 30 mm standard deviation, probably due to the much older installation and type of DORIS equipment. This comparison also allows testing of different DORIS analysis strategies with respect to their real impact on the precision of the derived tropospheric parameters. Ground truth information about the zenith delays can also be obtained from the ECMWF numerical weather model and at three sites using WVR measurements, allowing for comparisons with results from the space-geodetic techniques. While there is a good agreement (with some problems mentioned above about DORIS) among the space-geodetic techniques, the comparison with WVR and ECMWF is at a lower accuracy level. The complete CONT02 data set is sufficient to derive a good estimate of the actual precision and accuracy of each geodetic technique for applications in meteorology. Numéro de notice : A2006-088 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-005-0010-z En ligne : https://doi.org/10.1007/s00190-005-0010-z Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27815
in Journal of geodesy > vol 79 n° 10-11 (February 2006) . - pp 613 - 623[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-06011 RAB Revue Centre de documentation En réserve L003 Disponible 266-06012 RAB Revue Centre de documentation Revues en salle Disponible Systematic errors in the Z-geocenter derived using satellite tracking data: a case study from SPOT-4 DORIS data in 1998 / Pascal Willis in Journal of geodesy, vol 79 n° 10-11 (February 2006)
[article]
Titre : Systematic errors in the Z-geocenter derived using satellite tracking data: a case study from SPOT-4 DORIS data in 1998 Type de document : Article/Communication Auteurs : Pascal Willis , Auteur ; Jean-Paul Berthias, Auteur ; Yoaz E. Bar-Sever, Auteur Année de publication : 2006 Article en page(s) : pp 567 - 572 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] données DORIS
[Termes IGN] erreur systématique
[Termes IGN] géocentre
[Termes IGN] orbitographie
[Termes IGN] positionnement par DORIS
[Termes IGN] poursuite de satelliteRésumé : (Auteur) Within the scope of the Global Geodetic Observing System, Doppler Orbit Determination and Radiopositioning Integrated by Satellite - as a geodetic technique - can provide precise and continuous monitoring of the geocenter motion related to mass redistribution in the Earth, ocean and atmosphere system. We have reanalyzed 1998 DORIS/SPOT-4 (Satellite pour l'Observation de la Terre) data that were previously generating inconsistent geocenter positions (-65 cm offset). We show here that this error is due to an incorrect phase center correction provided with the DORIS preprocessed data resulting from a +12cm offset in the cross-track direction that has been confirmed since. We also conclude that a 1 mm error in the cross-track offset of non-yawing sun-synchronous SPOT satellites will generate a -6.5 mm error in the derived Z-geocenter. Other non-yawing satellites would also be affected by a similar effect whose amplitude could be easily estimated from the orbit inclination. Numéro de notice : A2006-086 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-005-0013-9 En ligne : https://doi.org/10.1007/s00190-005-0013-9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27813
in Journal of geodesy > vol 79 n° 10-11 (February 2006) . - pp 567 - 572[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-06011 RAB Revue Centre de documentation En réserve L003 Disponible 266-06012 RAB Revue Centre de documentation Revues en salle Disponible PermalinkPermalinkShuttle Radar Topography Mission elevation data error and its relationship to land cover / A. Shortridge in Cartography and Geographic Information Science, vol 33 n° 1 (January 2006)PermalinkLidar validation using GIS : a case study comparison between two Lidar collection methods / T.L. Webster in Geocarto international, vol 20 n° 4 (December 2005 - February 2006)PermalinkEffects of laser beam alignment tolerance on lidar accuracy / D. Latypov in ISPRS Journal of photogrammetry and remote sensing, vol 59 n° 6 (November 2005)PermalinkStratified sampling of satellite images with a systematic grid of points / F.J. Gallego in ISPRS Journal of photogrammetry and remote sensing, vol 59 n° 6 (November 2005)PermalinkBias-compensated RPCs [rational polynomial coefficient] for sensor orientation of high-resolution satellite imagery / Clive Simpson Fraser in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 8 (August 2005)PermalinkQuality assessment of digital surface models generated from Ikonos imagery / J. Poon in Photogrammetric record, vol 20 n° 110 (June - August 2005)PermalinkInfluence of system calibration on direct sensor orientation / N. Yastikli in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 5 (May 2005)PermalinkInteroperability on time: GPS-Galileo offset will bias position / A. Moudrak in GPS world, vol 16 n° 3 (March 2005)Permalink