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Modeling and sensing the vertical structure of the atmospheric path delay by microwave radiometry to correct SAR interferograms / Patrizia Basili in IEEE Transactions on geoscience and remote sensing, vol 52 n° 2 (February 2014)
[article]
Titre : Modeling and sensing the vertical structure of the atmospheric path delay by microwave radiometry to correct SAR interferograms Type de document : Article/Communication Auteurs : Patrizia Basili, Auteur ; Stefania Bonafoni, Auteur ; Piero Ciotti, Auteur ; Nazzareno Pierdicca, Auteur Année de publication : 2014 Article en page(s) : pp 1324 - 1335 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] correction atmosphérique
[Termes IGN] données localisées 3D
[Termes IGN] erreur de phase
[Termes IGN] image radar moirée
[Termes IGN] interféromètrie par radar à antenne synthétique
[Termes IGN] modèle atmosphérique
[Termes IGN] radiosondage
[Termes IGN] température de luminance
[Termes IGN] temps de propagation
[Termes IGN] teneur en vapeur d'eauRésumé : (Auteur) The vertical structure of the atmospheric water vapor induces phase errors in interferometric synthetic aperture radar (SAR) data. This paper presents a simulation study to investigate whether spaceborne submillimeter radiometric observations, which can be realized with fairly high spatial resolution, are able to derive the vertical structure of the atmospheric wet delay. The accuracy of the retrieved zenith wet delay (ZWD) trend as a function of surface height is assessed in order to correct the associated height dependence of the interferometric phase error in a SAR interferogram. Using a simulated benchmark, we evaluate the errors associated with the use of both a linear and an exponential model of the behavior of ZWD as a function of the surface height. This paper shows a fairly accurate reconstruction of the trend parameters estimated from radiometer brightness temperature images, with respect to realistic atmospheric profiles provided by radiosounding observations (RAOBs). The trend parameters that we consider in this paper are the slope K for the linear model and scale height H for the exponential one. An overall better accuracy is found for the exponential model, which is more representative of the actual behavior of ZWD with height, resulting in a residual uncertainty in the path delay due to the atmospheric stratification of approximately 0.2-0.3 cm and nearly zero bias, as compared to RAOBs. Numéro de notice : A2014-070 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2013.2250292 En ligne : https://doi.org/10.1109/TGRS.2013.2250292 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32975
in IEEE Transactions on geoscience and remote sensing > vol 52 n° 2 (February 2014) . - pp 1324 - 1335[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-2014021 RAB Revue Centre de documentation En réserve L003 Disponible Three-dimensional phase unwrapping for satellite radar interferometry, 1 : DEM generation / Batuhan Osmanoglu in IEEE Transactions on geoscience and remote sensing, vol 52 n° 2 (February 2014)
[article]
Titre : Three-dimensional phase unwrapping for satellite radar interferometry, 1 : DEM generation Type de document : Article/Communication Auteurs : Batuhan Osmanoglu, Auteur ; Timothy H. Dixon, Auteur ; Shimon Wdowinski, Auteur Année de publication : 2014 Article en page(s) : pp 1059 - 1075 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] filtre de Kalman
[Termes IGN] interféromètrie par radar à antenne synthétique
[Termes IGN] mesurage de phase
[Termes IGN] modèle numérique de terrainRésumé : (Auteur) Determining the Earth's surface topography and deformation with interferometric synthetic aperture radar involves measurement of phase, which, for a typical coherent radar signal, can only be done modulo 2?. The cycle of ambiguity inherent in the phase measurement has to be unwrapped over all observation dimensions (e.g., azimuth, range, and time) to remove the 2? ambiguity of the phase measurements. For a time series of SAR images, useful for reducing noise in topographic applications or measuring time-varying surface deformation, the necessary steps to connect ambiguous radar phase measurements are more challenging, and the operation may be termed 3-D phase unwrapping. We describe a 3-D unwrapping approach using an extended Kalman filter. Our approach readily exploits existing information, and is robust in the presence of noise. For all tested data sets, it provides improved accuracy compared to existing approaches. Numéro de notice : A2014-078 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2013.2247043 En ligne : https://doi.org/10.1109/TGRS.2013.2247043 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32983
in IEEE Transactions on geoscience and remote sensing > vol 52 n° 2 (February 2014) . - pp 1059 - 1075[article]Réservation
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Titre : Analysis of GNSS raw observations in PPP solutions Type de document : Thèse/HDR Auteurs : Erik Schönemann, Auteur Editeur : Darmstadt [Allemagne] : Technische Universität Darmstadt Année de publication : 2014 Collection : Schriftenreihe der Fachrichtung Geodäsie num. 42 Importance : 133 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-935631-31-0 Note générale : Vom Fachbereich Bau- und Umweltingenieurwissenschaften der Technischen Universität Darmstadt zur Erlangung des akademischen Grades eines Doktor-Ingenieurs (Dr.-Ing.) genehmigte Dissertation Langues : Anglais (eng) Descripteur : [Termes IGN] données GNSS
[Termes IGN] positionnement ponctuel précis
[Termes IGN] retard ionosphèrique
[Termes IGN] retard troposphérique
[Termes IGN] traitement de données GNSS
[Termes IGN] traitement du signal
[Vedettes matières IGN] Traitement de données GNSSIndex. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Résumé : (auteur) Global navigation satellite systems (GNSS) are an essential component in many areas of our daily life. They find application in diverse fields of private, commercial and scientific activities and are employed to meet the needs of police and military. Their fundamental importance for industrial countries is not the least the triggering point for the continuing modernisation of the existing and the development of new systems. The global satellite navigation systems are supplemented by regional satellite navigation systems (RNSS) and satellite based augmentation systems (SBAS). The diversity of systems, applied signal modulations and carrier frequencies, in particular in their combination, provide a broad range of opportunities along with new challenges.
The work presented herein focuses on the use of satellite navigation systems for precise positioning and timing applications and scientific analysis. For best and comprehensive results, an equivalent combination of all available systems and signals is a fundamental requirement. For these reasons, relative approaches based on observation differences are rather inappropriate. Hence, this thesis focuses primarily on the method of precise point positioning (PPP) by waiving linear combinations. The objective is the development of a universal PPP analysis approach for standalone PPP and network solutions. Raw observations conserve the physical properties of original observation. This allows a detailed analysis of individual signal characteristics, but leads to the necessity of handling them. The utilisation of raw observations comes along with maximum flexibility. It allows for the application of physical error models as well as individual weighting and edition of all individual observation types. The possibility of a joint processing of all observations and the estimation of all parameters in a single run results in a significant simplification of the processing procedure.
The first part of the thesis provides a general introduction to conventional GNSS analysis and highlights the limitations thereof. The second part introduces the technique of raw observations processing. It highlights the differences from the common ionosphere free processing approach and discusses the challenges. The concept presented for the analysis of GNSS raw observations is flexible and adjustable to any kind of GNSS application. This flexibility is attributed to a variety of different possible interpretations of the raw observation equation. In the frame of this thesis, a selection of different interpretations is introduced and demonstrated. One of the most important parameters for the analysis of raw observations is the so-called uncalibrated signal delays. The work presented exemplarily demonstrates their characteristics and discusses their implications for the analysis.
For maximum stability of the results, it is common practice to resolve and apply integer carrier phase ambiguities. The presented work discusses and demonstrates the feasibility of this methodology for the implemented approach. It shows that the new approach simplifies the resolution of inter-GNSS carrier phase ambiguities and extends the spectrum of resolvable ambiguities.
It is demonstrated that the proposed concept provides an “at least” equivalent alternative to the common processing strategies, applicable for highly precise standalone, as well as network PPP solutions, allowing for the simplified, consistent processing of different numbers of observation, suitable for an optimal, flexible, equivalent, joint processing of arbitrary GNSS observation types. It introduces a new dimension of analysis, with direct access to all individual observations and parameters.Note de contenu : 1 Introduction
1.1 Objectives of the research
1.2 External reference solutions
1.3 Outline of this thesis
2 Principles of Global Navigation Satellite Systems
2.1 General architecture
2.2 Geodetic reference systems and timescales
2.3 Navigation signals
3 Conventional GNSS analysis
3.1 Receiver system
3.2 GNSS observation modelling
3.3 Parameter estimation
3.4 Resolution of carrier phase ambiguities
4 Analysis of raw GNSS observations
4.1 Benefits of raw observation analyses
4.2 Challenges of raw observation analyses
4.3 Ambiguity resolution for raw observations
5 Implementation and general processing strategy
5.1 Software implementation
5.2 GNSS processing strategy applied
5.3 Parameter estimation setup
5.4 Observation weighting and screening criteria
6 Analysis of uncalibrated signal delays
6.1 Receiver-dependent signal delays
6.2 Satellite-related signal delays
6.3 Summary of analyses of uncalibrated signal delays
7 Applicability of raw observation processing
7.1 Applicability for global networks
7.2 Applicability for standalone PPP
7.3 Optimisation via bias calibration and ambiguity resolution
8 Conclusions
8.1 Challenges of raw observation analysis
8.2 Benefits and capabilities of raw observation analysis
8.3 Ambiguity fixing in the case of raw observations
8.4 Experiments and analyses
8.5 Future workNuméro de notice : 14900 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Note de thèse : PhD : Fachbereich Bau- und Umweltingenieurwissenschaften : Technische Universität Darmstadt : 2014 DOI : sans En ligne : http://tuprints.ulb.tu-darmstadt.de/3843/7/Schoenemann_Dissertation_TUD.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76785 Documents numériques
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14900 these 2014 SchnemannAdobe Acrobat PDF Atmospheric water vapour sensing by means of differential absorption spectrometry using solar and lunar radiation / Stefan Walter Münch (2014)
Titre : Atmospheric water vapour sensing by means of differential absorption spectrometry using solar and lunar radiation Type de document : Thèse/HDR Auteurs : Stefan Walter Münch, Auteur Editeur : Zurich : Schweizerischen Geodatischen Kommission / Commission Géodésique Suisse Année de publication : 2014 Collection : Geodätisch-Geophysikalische Arbeiten in der Schweiz, ISSN 0257-1722 num. 92 Importance : 210 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-908440-35-2 Note générale : bibliographie, thèse publiée
Diss., Eidgenössische Technische Hochschule ETH Zürich, Nr. 21491, 2013Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Atmosphère
[Termes IGN] correction troposphérique
[Termes IGN] détecteur à transfert de charge
[Termes IGN] pouvoir de résolution spectrale
[Termes IGN] rayonnement solaire
[Termes IGN] spectromètre
[Termes IGN] spectrométrie
[Termes IGN] teneur en vapeur d'eau
[Termes IGN] troposphèreIndex. décimale : 47.50 Atmosphère Résumé : (auteur) Tropospheric water vapour plays a crucial role in the understanding of a variety of different atmospheric processes, ranging from local weather phenomena to global climate change. Regarding satellite geodesy, water vapour acts as disturbing factor for various measurement methods, causing path delays of radio signals and consequently leads to considerable biases in the measurement results. The spatial and temporal concentration distribution can hardly be modelled and therefore has to be determined instrumentally to correct the influence computationally. The application of the principle of “Differential Optical Absorption Spectroscopy” (DOAS) using the sun as radiation source to locally determine integrated water vapour concentrations (PW), has proven itself as a very potent methodology, with good relative and absolute accuracy, high temporal resolution and comparably low calibration efforts. It also seems especially well suited for validation purposes for independent measurement methods.
The intention of the presented project is to implement the findings from the development of earlier prototype instruments and to contemplate several further aspects related with the DOAS approach to determine atmospheric water vapour: Improved temporal coverage of the measurement method through inclusion of night time measurements with the help of moonlight, which are enabled by means of a massively increased system sensitivity to deal with the up to six orders of magnitude lower intensity of the background radiation with respect to solar measurements. Further it is to investigate, how reliable acquisitions of sun transmission spectra can be achieved, when deploying the system on moving platforms, for possible future validation measurements of satellite-borne radiometer data on satellite ground tracks on the open sea. The prototype instruments developed should particularly feature high field versatility, requiring eased transportability, resistance to weather and not least the possibility of a fully automatic measurement procedure, including instrument self-calibration.
For this purpose two identically constructed compact measurement systems were built. The instruments dispose of a custom-built telescope (heliostat principle) and an optically directly coupled spectrometer unit. The whole system is enclosed in a rugged aluminium hull, including most of the steering electronics. The motorized telescope is able to follow the moving light source fully autonomously, also with the platform moderately moving. A quasi-monochromator with an echelle grating as main dispersion element is used as spectrometer unit, allowing a compact architecture, a great spectral resolution and efficiency at the same time. Together with a back-thinned CCD detector highly resolved images of water vapour absorption lines can be obtained. The primary wavelength range lies between 789 nm and 802 nm, the reciprocal linear dispersion amounts to 7.3 pm/px at a focal length of just 400 mm. A motorized deflection mirror in the spectrometer allows the observation of adjacent spectral windows and serves for the highly precise position stabilization of the spectrum on the CCD sensor.
Test measurements with the sun and the moon as background radiation source show the extraordinarily high system light throughput and the high spectral resolving power of the apparatus. However illumination dependent interference structures on the detector (etaloning) prevent the deduction of usable transmission spectra from the measured raw data. For that reason a variety of optical measures to homogenize the radiation entering the spectrometer with respect to field and aperture are examined. As a feasible solution, with sufficient radiation distribution and a still acceptable intensity attenuation, a short quartz light guiding fibre with a hexagonal cross section has been found and implemented.
For instrumental control a software package has been developed, which autonomously handles the measurement process including the various calibration processes and the interaction of the various sensors and actuators. Additionally a variety of algorithms have been provided, helping to eliminate various defective influences in the raw data, as the correction of stray and false light portions or the elimination of interspersed beat structures in lunar spectra. Furthermore procedures which serve in spectrum processing have been supplied, as for the computation of a holistic intensity baseline or the dynamic determination of apparatus profiles. For the determination of the water vapour concentrations from the measured spectroscopic data established computational procedures could be used mostly.
Various available spectroscopic databases have been analysed regarding the suitability of the listed absorption line parameters for the deduction of reliable water vapour concentrations. Comparison between the two identically built solar spectrometers yield considerable deviations of up to 1.5 kg/m 2 in the zenith integral concentrations which are presumably ascribable to systematic influences likely caused by unrecognized stray light influence. The mean value of the stochastic deviations amounts to about 1.1 % of the slant PW concentration. The cross-comparison with an independent measurement method, in this case GPS meteorology, however also shows significant divergences and thus point to the various further systematic effects which have to be examined more closely, as e.g. the uncertainty of the published spectroscopic parameters regarding line strength and line broadening as well as the baseline determination in the measured spectra.
Despite the considerable sensitivity losses with respect to the originally planned design due to beam homogenization, the methodology has been successfully applied to lunar measurements, albeit with reduced accuracy as stated in stochastic appraisals and with considerably lower temporal resolution.
The project presented here confirms and clarifies the possibilities of the application of DOAS for ground- based remote sensing of integral water vapour concentrations, but also gives clear indication on the different systematic biases which have to be examined more closely, e.g. regarding the accuracy of the spectroscopic parameters (both, for line strength and line broadening), as well as the determination procedure of the baseline in the measured spectra. This work also points out the chances as well as the serious difficulties which arise from the design, construction and deployment of highly integrated DOAS spectrometers of high performance. Regarding the application of various optical components and detectors for the development of similar instruments valuable insights have been gathered.Numéro de notice : 14913 Affiliation des auteurs : non IGN Autre URL associée : URL ETH Zurich Thématique : POSITIONNEMENT Nature : Thèse étrangère Note de thèse : PhD : Sciences : ETH Zurich : 2013 DOI : 10.3929/ethz-a-010006561 En ligne : http://e-collection.library.ethz.ch/view/eth:7591 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76813 Réservation
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Titre : Blind tropospheric model for Austria Type de document : Mémoire Auteurs : Paoline Prevost, Auteur Editeur : Champs-sur-Marne : Ecole nationale des sciences géographiques ENSG Année de publication : 2014 Importance : 36 p. Format : 21 x 30 cm Note générale : bibliographie
Rapport de projet pluridisciplinaire, cycle Ingénieur 2e annéeLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] Autriche
[Termes IGN] correction troposphérique
[Termes IGN] données météorologiques
[Termes IGN] international GPS service for geodynamics
[Termes IGN] modèle numérique
[Termes IGN] propagation troposphérique
[Termes IGN] retard troposphérique
[Termes IGN] signal GNSS
[Termes IGN] station GNSS
[Termes IGN] teneur en vapeur d'eau
[Termes IGN] traitement de données GNSS
[Termes IGN] traitement du signalIndex. décimale : PROJET Mémoires : Rapports de projet - stage des ingénieurs de 2e année Résumé : (auteur) Lors de la traversée de l’atmosphère, les signaux GNSS sont retardés. Ces retards peuvent être séparés en deux parties : la partie humide et l’autre dite hydrostatique (Saastamoinen, 1972). Ces délais peuvent être très importants, c’est pourquoi il est très important de savoir les modéliser. Pour cela, des modèles de correction troposphérique peuvent être utilisés. Le but de ce stage est de développer un modèle régional numérique de correction troposphérique pour l’Autriche. Une grille d’une très bonne résolution était nécessaire à cause des nombreuses régions montagneuses que comporte l’Autriche. Après avoir traité les données météorologiques pour les rendre utilisables dans nos calculs, les paramètres nécessaires aux calculs des deux parties du retard troposphérique ont été calculés comme suggéré dans (Nafisi, 2012) et (Pain, 2013). Puis, le délai total a été comparé pour trois stations IGS avec GPT2w, un modèle numérique mondial des corrections troposphériques également développé par l’université technologique de Vienne. Note de contenu : Introduction
1 Context
1.1 Technical definitions
1.1.1 Blind model
1.1.2 Zenith delay
1.2 The existing
1.3 Objectives
2 Method
2.1 Preparation of the data
2.1.1 Presentation of the data
2.1.2 Treatment of the data
2.2 Calculation of the parameters
2.2.1 Define the useful parameters
2.2.2 Harmonic decomposition – Least square calculation
3 Results
3.1 Internal validation
3.1.1 Pressure
3.1.2 Water vapor decrease factor
3.1.3 Hydrostatic mapping function coefficient
3.1.4 Temperature lapse rate
3.2 External validation
ConclusionNuméro de notice : 22178 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Mémoire de projet pluridisciplinaire Organisme de stage : Université Technique de Vienne Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74681 Réservation
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