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Дисертації з теми "Radar sounders"

Автор: Grafiati

Опубліковано: 11 березня 2023

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1

Leonardo, Carrer. "Advanced Signal Processing Methods for Planetary Radar Sounders Data." Doctoral thesis, Università degli studi di Trento, 2018. https://hdl.handle.net/11572/368977.

Повний текст джерела

Анотація:

Radar sounders are spaceborne electromagnetic sensors specifically designed for subsurface investigations. They operate in the HF/VHF part of the electromagnetic spectrum and are widely employed for applications such as monitoring changes to the polar ice sheets of the Earth and for the study of planetary bodies (e.g. Mars) from satellite. Radar sounding of planetary bodies is a relatively young discipline both in terms of system design and data processing architectures. As a result of the current state of the art in system design, the data recorded by radar sounders are typically affected by

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2

Gerekos, Christopher. "Advanced Backscattering Simulation Methods for the Design of Spaceborne Radar Sounders." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/261416.

Повний текст джерела

Анотація:

Spaceborne radar sounders are an important class of remote sensing instruments which operate by recording backscattered electromagnetic waves in the vicinity of a solid planetary body. The incoming waves are generally transmitted by the radar itself (active sounding), although external signals of opportunity can also be used (passive sounding). There are currently two major planetary radar sounders under development, both headed to the Jovian icy moons (Europa, Ganymede and Callisto). Designing a radar sounder is a very challenging process involving careful leveraging of heritage and predictiv

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3

Gerekos, Christopher. "Advanced Backscattering Simulation Methods for the Design of Spaceborne Radar Sounders." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/261416.

Повний текст джерела

Анотація:

Spaceborne radar sounders are an important class of remote sensing instruments which operate by recording backscattered electromagnetic waves in the vicinity of a solid planetary body. The incoming waves are generally transmitted by the radar itself (active sounding), although external signals of opportunity can also be used (passive sounding). There are currently two major planetary radar sounders under development, both headed to the Jovian icy moons (Europa, Ganymede and Callisto). Designing a radar sounder is a very challenging process involving careful leveraging of heritage and predictiv

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4

Sbalchiero, Elisa. "Advanced Methods for Generating and Processing Simulated Radar Sounder Data for Planetary Missions." Doctoral thesis, Università degli studi di Trento, 2022. https://hdl.handle.net/11572/355183.

Повний текст джерела

Анотація:

Radar sounders (RS) are active instruments that have proved to be able to profile the subsurface of planetary bodies. The design of RS instruments, as well as the interpretation of the acquired data, is a non-trivial task due to the complexity of the scenario of acquisition and the limited amount of information on the targets (especially in planetary exploration). In this context, data simulations are necessary to support the design of the radar, the development of the related processing chain, and the definition of algorithms for the automatic analysis of data. However, state-of-the-art RS s

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5

Ferro, Adamo. "Advanced Methods for the Analysis of Radar Sounder and VHR SAR Signals." Doctoral thesis, Università degli studi di Trento, 2011. https://hdl.handle.net/11572/368915.

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Анотація:

In the last decade the interest in radar systems for the exploration of planetary bodies and for Earth Observation (EO) from orbit increased considerably. In this context, the main goal of this thesis is to present novel methods for the automatic analysis of planetary radar sounder (RS) signals and very high resolution (VHR) synthetic aperture radar (SAR) images acquired on the Earth. Both planetary RSs and VHR SAR systems are instruments based on relatively recent technology which make it possible to acquire from orbit new types of data that before were available only in limited areas from ai

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6

Thakur, Sanchari. "Advanced Methods for Simulation and Performance Analysis of Planetary Radar Sounder Data." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/259173.

Повний текст джерела

Анотація:

Radar sounders (RS) are low frequency remote sensing instruments that profile the shallow subsurface of planetary bodies providing valuable scientific information. The prediction of the RS performance and the interpretation of the target properties from the RS data are challenging due to the complex electromagnetic interaction between many acquisition variables. RS simulations address this issue by forward modeling this complex interaction and simulating the radar response. However, existing simulators require detailed and subjective modeling of the target in order to produce realistic radargr

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7

Thakur, Sanchari. "Advanced Methods for Simulation and Performance Analysis of Planetary Radar Sounder Data." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/259173.

Повний текст джерела

Анотація:

Radar sounders (RS) are low frequency remote sensing instruments that profile the shallow subsurface of planetary bodies providing valuable scientific information. The prediction of the RS performance and the interpretation of the target properties from the RS data are challenging due to the complex electromagnetic interaction between many acquisition variables. RS simulations address this issue by forward modeling this complex interaction and simulating the radar response. However, existing simulators require detailed and subjective modeling of the target in order to produce realistic radargr

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8

Donini, Elena. "Advanced methods for simulation-based performance assessment and analysis of radar sounder data." Doctoral thesis, Università degli studi di Trento, 2021. http://hdl.handle.net/11572/304147.

Повний текст джерела

Анотація:

Radar Sounders (RSs) are active sensors that transmit in the nadir electromagnetic (EM) waves with a low frequency in the range of High-Frequency and Very-High-Frequency and relatively wide bandwidth. Such a signal penetrates the surface and propagates in the subsurface, interacting with dielectric interfaces. This interaction yields to backscattered echoes detectable by the antenna that are coherently summed and stored in radargrams. RSs are used for planetary exploration and Earth observation for their value in investigating subsurface geological structures and processes, which reveal the pa

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9

Donini, Elena. "Advanced methods for simulation-based performance assessment and analysis of radar sounder data." Doctoral thesis, Università degli studi di Trento, 2021. http://hdl.handle.net/11572/304147.

Повний текст джерела

Анотація:

Radar Sounders (RSs) are active sensors that transmit in the nadir electromagnetic (EM) waves with a low frequency in the range of High-Frequency and Very-High-Frequency and relatively wide bandwidth. Such a signal penetrates the surface and propagates in the subsurface, interacting with dielectric interfaces. This interaction yields to backscattered echoes detectable by the antenna that are coherently summed and stored in radargrams. RSs are used for planetary exploration and Earth observation for their value in investigating subsurface geological structures and processes, which reveal the pa

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10

Ilisei, Ana-Maria. "Advanced Methods for the Analysis of Radar Sounder Data Acquired at the Ice Sheets." Doctoral thesis, Università degli studi di Trento, 2016. https://hdl.handle.net/11572/367890.

Повний текст джерела

Анотація:

The World Climate Research Programme (WCRP) has recently reconfirmed the importance of a better understanding of the Cryosphere for advancing the analysis, modeling and prediction of climate change and its impact on the environment and society. One of the most complete collection of information about the ice sheets and glaciated areas is contained in the data (radargrams) acquired by Radar Sounder (RS) instruments. The need to better understand the structure of the ice sheets and the availability of enourmous quantities of radargrams call for the development of automatic techniques for an effi

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11

Berquin, Yann. "Assessing the performances and optimizing the radar sounder design parameters for the EJSM mission (Ganymede and Europa)." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENU001/document.

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Анотація:

On se propose dans un premier temps d'étudier des jeux de données topographiques sur la lune glacée de Jupiter Ganymède et d'estimer l'impact de la topographie sur les performances du futur radar sondeur. Les principaux résultats sont présentés dans [1]. Une seconde partie est dédiée à l'expression mathématique du problème direct du sondage radar planétaire (physique et instrumentation). On rappelle ainsi comment dériver à partir des formulations de Stratton-Chu les formulations volumiques classiques et surfaciques (i.e. Huygens-Fresnel). On s'attache ensuite à détailler un algorithme performa

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12

Ford, Felicity Valerie. "The Domestic Soundscape and beyond : presenting everyday sounds to audiences." Thesis, Oxford Brookes University, 2010. http://radar.brookes.ac.uk/radar/items/7e50609e-9838-91b2-a2fc-86103493075a/1.

Повний текст джерела

Анотація:

This PhD submission contains a select portfolio of practical works that have been created in answer to my research questions. This Thesis contextualises those works in a theoretical framework, linking them explicitly to the academic discourses with which they are inexorably bound. The introduction of this Thesis examines the research context in which research questions were formed. Evaluating a complicated previous project and describing a seminal, difficult encounter with the realm of sound art, this section explores some of the problems involved with presenting everyday sounds to audiences a

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13

Sandford, David J. "Dynamics of the stratosphere, mesosphere and thermosphere." Thesis, University of Bath, 2008. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.512300.

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Анотація:

This thesis presents observations of the dynamical features of the stratosphere, mesosphere and lower thermosphere. These are made from various observational techniques and model comparisons. A focus of the work is the two-day wave at high latitudes in the MLT region. This has revealed significant wave amplitudes in both summer and winter. However, these waves are shown to have very different origins. Using satellite data, the summertime wave is found to be the classic quasi-two-day wave which maximises at mid-latitudes in the MLT region. The wintertime wave is found to be a mesospheric manife

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14

Edel, Léo. "Vers une meilleure connaissance des précipitations en Arctique : utilisation de la télédétection spatiale micro-ondes." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLX108.

Повний текст джерела

Анотація:

Parce que l’incertitude des mesures des précipitations solides est importante en Arctique, les taux de chutes de neige montrent des différences marquées entre les jeux de données disponibles. Afin de caractériser plus précisément les précipitations arctiques, la télédétection spatiale micro-ondes s’avère être un outil idéal. Les observations collectées par le radar à bord du satellite CloudSat ont permis d’obtenir les taux de chutes de neige à la surface pour quatre années complètes. Ces estimations ont été validées avec des données de stations météorologiques, et comparées à diverses climatol

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15

Hawkinson, James A. "A comparison study using the goes sounder cloud top pressure product and cloud lidar and radar." 2003. http://catalog.hathitrust.org/api/volumes/oclc/53142756.html.

Повний текст джерела

Анотація:

Thesis (M.S.)--University of Wisconsin--Madison, 2003.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 32-33).

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