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MBOC vs BOC (1,1): multipath comparison based on GIOVE-B data / A. Simsky in Inside GNSS, vol 3 n° 6 (September 2008)
[article]
Titre : MBOC vs BOC (1,1): multipath comparison based on GIOVE-B data Type de document : Article/Communication Auteurs : A. Simsky, Auteur ; D. Mertens, Auteur ; M. Hollreiser, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : 5 p. ; pp 36 - 40 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] analyse comparative
[Termes IGN] correction du trajet multiple
[Termes IGN] données Galileo
[Termes IGN] modulation du signal
[Termes IGN] phase
[Termes IGN] trajet multipleRésumé : (Editeur) In 2004 the United States and the European Union signed a ground-breaking agreement to provide common, interoperable signals for civil users of GPS and Galileo: a binary offset carrier (BOC) modulation with a 1.023 MHz sub-carrier frequency and a code rate of 1.023 mega-chips per second — BOC (1,1) — centered at 1575.42 MHz. Subsequent discussions by a US/EU technical working group produced what was considered — not without dissent — to be an even better signal structure: a multiplex BOC. With the GIOVE-B satellite now in orbit and broadcasting the new signals, a team of researchers have evaluated the actual improvement in multipath mitigation by MBOC relative to BOC(1,1). Copyright Gibbons Media & Research LLC Numéro de notice : A2008-676 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33521
in Inside GNSS > vol 3 n° 6 (September 2008) . - 5 p. ; pp 36 - 40[article]Documents numériques
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MBOC vs BOC (1,1) ... - pdf éditeurAdobe Acrobat PDF Doris satellite antenna maps derived from long-term residuals time series / Pascal Willis in Advances in space research, vol 36 n° 3 (March 2005)
[article]
Titre : Doris satellite antenna maps derived from long-term residuals time series Type de document : Article/Communication Auteurs : Pascal Willis , Auteur ; Shailen Desai, Auteur ; Willy I. Bertiger, Auteur ; Bruce J. Haines, Auteur ; Albert Auriol, Auteur Année de publication : 2005 Article en page(s) : pp 486 - 497 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] balise DORIS
[Termes IGN] DORIS
[Termes IGN] orbitographie
[Termes IGN] phase
[Termes IGN] récepteur DORIS
[Termes IGN] série temporelle
[Termes IGN] trajet multipleRésumé : (Auteur) Recent studies have shown that phase pattern models for the Jason1 GPS antenna significantly benefit GPSbased precise orbit determination (POD) for the satellite. We have used a similar technique to derive DORIS receiver antenna maps, using all available DORIS tracking data over long time periods (from 1993.0 to 2004.0). We demonstrate that the derived correction models are satellite specific. For a given satellite, yeartoyear estimations show clear systematic patterns. Some of these systematic patterns are attributable to the derivative of the multipath effects in the direction of the satellite velocity. For early SPOT data, the patterns can be explained by an offset in the TAI time tagging (typically 8 us). In a second step, we have applied the SPOT2 antenna correction models in precise orbit determination and in the positioning of ground beacons. Preliminary results on DORIS/SPOT2 show that application of the DORIS antenna maps lead to a slight improvement of the derived POD and geodetic results (typically less than 5%). Numéro de notice : A2005-603 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2005.03.095 Date de publication en ligne : 06/05/2005 En ligne : https://doi.org/10.1016/j.asr.2005.03.095 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33946
in Advances in space research > vol 36 n° 3 (March 2005) . - pp 486 - 497[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 38017-01 30.82 Tiré à part Centre de documentation Géodésie Disponible The GNSS integer ambiguities / S. Verhagen (2005)
Titre : The GNSS integer ambiguities : estimation and validation Type de document : Monographie Auteurs : S. Verhagen, Auteur Editeur : Delft : Netherlands Geodetic Commission NGC Année de publication : 2005 Collection : Netherlands Geodetic Commission Publications on Geodesy, ISSN 0165-1706 num. 58 Importance : 170 p. Format : 17 x 24 cm ISBN/ISSN/EAN : 978-90-6132-290-0 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] ambiguïté entière
[Termes IGN] axiome de Bayes
[Termes IGN] code GPS
[Termes IGN] contrôle qualité
[Termes IGN] distribution de Student
[Termes IGN] distribution, loi de
[Termes IGN] estimation statistique
[Termes IGN] Galileo
[Termes IGN] Global Navigation Satellite System
[Termes IGN] Global Orbitography Navigation Satellite System
[Termes IGN] Global Positioning System
[Termes IGN] mesurage de phase
[Termes IGN] méthode des moindres carrés
[Termes IGN] modèle fonctionnel
[Termes IGN] modèle stochastique
[Termes IGN] phase
[Termes IGN] propagation du signal
[Termes IGN] qualité des données
[Termes IGN] résidu
[Termes IGN] résolution d'ambiguïtéIndex. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Résumé : (Auteur) Fast and high precision relative positioning with a Global Navigation Satellite System (GNSS) is only possible by using the very precise carrier phase measurements. However, these carrier phases are ambiguous by an unknwon number of cycles. The knowledge that the ambiguities are integer-valued has been exploited in the past 15 years for the development of integer ambiguity resolution algorithms. Once the ambiguities are fixed to their integer values, the carrier phase measurements start to act as if they were very precise pseudorange measurements. [...] Nowadays, the non-trivial problem of integer ambiguity estimation can be considered solved. However, a parameter estimation theory is not complete without the appropriate measures to validate the solution. [...] Obviously, validation of the integer ambiguity solution is still an open problem. Two approaches are investigated here. The first method uses a new ambiguity estimator, the Best Integer Equivariant (BIE) estimator. [...] It was shown that the BIE estimator significantly outperforms the float or fixed solution only in a limited number of cases. Therefore, another new class of integer estimators is investigated : the class of Integer Aperture (IA) estimators. [...] IA estimation has several important advantages. [...] Finally, it is shown that the popular ratio test perform almost as good as the optimal IA estimator if the fixed fail rate approach is used. [...] Note de contenu : Summary
Notation and symbols
Acronyms
1 Introduction
1.1 Background
1.2 Objectives and contribution of this work
1.3 Outline
2 GNSS observation model and quality control
2.1 Global Navigation Satellite Systems
2.2 GNSS observation equations
2.3 GNSS functional model
2.4 GNSS stochastic model
2.5 Least-squares estimation and quality control
3 Integer ambiguity resolution
3.1Integer estimation
3.2Quality of the integer ambiguity solution
3.3 The ambiguity residuals .
3.4 Quality of the fixed baseline estimator
3.5 Validation of the fixed solution
3.6 The Bayesian approach
4 Best Integer Equivariant estimation
4.1 The BIE estimator
4.2 Approximation of the BIE estimator
4.3 Comparison of the float, fixed, and BIE estimators .
4.4 Summary . .
5 Integer Aperture estimation
5.1 Integer Aperture estimation
5.2 Ellipsoidal integer aperture estimation
5.3 Ratio test, difference test and projector test
5.4 Integer Aperture Bootstrapping and LeastSquares .
5.5 Penalized Integer Aperture estimation
5.6 Optimal Integer Aperture estimation
5.7 Implementation aspects
5.8 Comparison of the different IA estimators
5.9 Performance of IA estimation
5.10 Summary
6 Conclusions and recommendations
6.1 Integer estimation and validation
6.2 Quality of the baseline estimators
6.3 Reliability of the results
6.4 Bias robustness
A Mathematics and statistics
A.1 Kronecker product
A.2 Parameter distributions
A.3 Numerical root finding methods
B Simulation and examples
B.1 Simulation
B.2 Examples.
C Theory of BlE estimation
C.1 Integer equivariant ambiguity estimation
C.2 Integer equivarlant unbiased ambiguity estimation
C.3 Best integer equivariant unbiased ambiguity estimation
C.4 Best integer equivariant unbiased baseline estimation
D Implementation aspects of IALS estimationNuméro de notice : 15134 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=55070 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15134-01 30.61 Livre Centre de documentation Géodésie Disponible 15134-02 30.61 Livre Centre de documentation Géodésie Disponible A quantitative measure for the quality of InSAR interferograms based on phase differences / Z. Li in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 10 (October 2004)
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Titre : A quantitative measure for the quality of InSAR interferograms based on phase differences Type de document : Article/Communication Auteurs : Z. Li, Auteur ; W. Zou, Auteur ; X. Ding, Auteur ; Y. Chen, Auteur ; G. Liu, Auteur Année de publication : 2004 Article en page(s) : pp 1131 - 1137 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] image radar moirée
[Termes IGN] phase
[Termes IGN] qualité d'imageRésumé : (Auteur) It is well-known that interferometric SAR (INSAR) is a technology for the generation of high-precision digital elevation models (DEM) and the precise measurement of terrain surface deformation. The accuracy of DEM and deformation measurement is highly dependent on the quality of the interferogram generated. Such an interferogram is constructed by a pointwise complex multiplication of corresponding pixels in both datasets, which are respectively contained in master image and registered image. An exanimation of existing literature reveals that there is no, good, quantitative measure for the quality of interferograms, and visual inspection is still the best solutions available so far. By visual inspection, one recognizes those interferograms with continuous fringes as good ones and regards those with many discontinuous interferograms and speckles as being not good. As the pixels in the interferogram represent the phase value values, it is natural to think that, if the quality is good, the phase differences between neighbor pixels should be small, and thus the sum of all phase differences will still be small. This leads to the proposal of "sum of phase differences" (SPD) as a quantitative measure for the quality of interferogram. Two simulation tests have been conducted, and the results show that the SPD is a reliable measure. Numéro de notice : A2004-361 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.70.10.1131 En ligne : https://doi.org/10.14358/PERS.70.10.1131 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26888
in Photogrammetric Engineering & Remote Sensing, PERS > vol 70 n° 10 (October 2004) . - pp 1131 - 1137[article]A phase signature for detecting wet subsurface structures using polarimetric L-band SAR / Y. Lasne in IEEE Transactions on geoscience and remote sensing, vol 42 n° 8 (August 2004)
[article]
Titre : A phase signature for detecting wet subsurface structures using polarimetric L-band SAR Type de document : Article/Communication Auteurs : Y. Lasne, Auteur ; P. Paillou, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 1683 - 1694 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] bande L
[Termes IGN] dune
[Termes IGN] eau souterraine
[Termes IGN] équation intégrale
[Termes IGN] humidité du sol
[Termes IGN] image AIRSAR
[Termes IGN] paléosol
[Termes IGN] phase
[Termes IGN] sable
[Termes IGN] simulation numérique
[Termes IGN] traitement du signal
[Termes IGN] zone arideRésumé : (Auteur) In this paper, we investigate the ability of L-band synthetic aperture radar (SAR) systems to penetrate soils to retrieve information about subsurface wet structures. Our experiment site, the Pyla dune, is a bare sandy area allowing high radar penetration and known to have large wet subsurface structures (paleosoils) at varying depths. Buried paleosoils, which act as moisture tanks, are detectable with radar, since they present a high permittivity due to their water content. By analyzing airborne polarimetric SAR data, we established that a phase signature is correlated to the buried wet palesoils: a phase difference of 23° between the horizontal (HH) and vertical (V V) channels was clearly observed. It allows detection of the paleosoil down to a larger depth (5.2 m) than when only considering HH and HV amplitude signals (3.5 m). In order to confirm this result, field measurements were performed that led to the same observed phase difference. We could fit our observations to the semiempirical model proposed by Oh and Sarabandi, and we reproduced the observed phenomenon using a two-layer integral equation method (IEM) model of the Pyla dune, which was completed by finite-difference time-domain (FDTD) numerical simulations. We show that the soil moisture significantly influences the radar response in terms of phase difference between the copolarised modes. Our study also shows that the single-scattering IEM model reproduces the observed phase difference fairly well for a natural outdoor site when combined to FDTD simulation results. This phase signature could be used as a new tool to map subsurface moisture in arid regions. Numéro de notice : A2004-428 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2004.830645 En ligne : https://doi.org/10.1109/TGRS.2004.830645 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26955
in IEEE Transactions on geoscience and remote sensing > vol 42 n° 8 (August 2004) . - pp 1683 - 1694[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-04081 RAB Revue Centre de documentation En réserve L003 Disponible Satellites / Michel Capderou (2003)PermalinkModeling and reduction of SAR interferometric phase noise in the wavelet domain / C. Lopez-Martinez in IEEE Transactions on geoscience and remote sensing, vol 40 n° 12 (December 2002)PermalinkRéalisation d'un système d'information géographique dédié à l'étude des déformations de surface sur la ville de Paris / J.L. Kouame (2002)PermalinkEntwicklung und Erprobung eines abbildenden Laseraltimeters für den Flugeinsatz unter Verwendung des Mehrfrequenz- Phasenvergleichsverfahrens / C. Hug (1996)PermalinkSpotlight synthetic aperture radar / W.G. Carrara (1995)PermalinkEntwurf digitaler zweidimensionaler nichtrekursiver Filter / Dieter Fritsch (1982)PermalinkLe contraste de phase et le contraste par interférences, Colloque de la Commission internationale d'optique / Maurice Françon (1952)Permalink