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Author: Annabelle Ollivier
Publisher:
ISBN:
Category :
Languages : fr
Pages : 189
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Book Description
Les radars altimètres embarqués à bord de satellites à 1000 km d'altitude permettent d'étudier des variations du niveau de la mer de l'ordre du centimètre! Ils permettent aussi d'estimer la hauteur des vagues et la vitesse du vent de long des traces des satellites. Ces paramètres sont estimés à partir des échos radar qui possèdent une forme significative de la surface sur laquelle ils se réfléchissent. La précision, la résolution et la qualité de ces estimations sont des préoccupations permanentes pour "exploitation des mesures. Nous proposons dans cette thèse de réduire le niveau de bruit des mesures avant l'étape d'estimation c'est-à-dire sur les échos altimétriques. Pour cela, nous exploitons leur corrélation spatiale en travaillant sur des matrices d'échos consécutifs. Cette approche matricielle constitue une nouveauté dans le traitement du signal altimétrique. Son principal atout est de définir des sous-espaces vectoriels permettant d'isoler "information utile du bruit qui l'altère. Elle permet de définir des échos très peu bruités sans perdre l'information géophysique et avec une résolution maximale. Nous établissons un traitement optimal au sens des moindres carrés en s'appuyant sur des simulations et une validation sur les données réelles de plusieurs altimètres. Grâce aux échos débruités obtenus, les paramètres géophysiques sont extraits avec une précision accrue. En réduisant le bruit haute fréquence, nous mettons en évidence une variabilité spatiale plus fine échelle, jusqu'à présent noyée dans le bruit de mesure. Cette méthode simple et efficace permet d'affiner la précision et la résolution des paramètres estimés le long des traces des satellites.
Author: Annabelle Ollivier
Publisher:
ISBN:
Category :
Languages : fr
Pages : 189
Get Book Here
Book Description
Les radars altimètres embarqués à bord de satellites à 1000 km d'altitude permettent d'étudier des variations du niveau de la mer de l'ordre du centimètre! Ils permettent aussi d'estimer la hauteur des vagues et la vitesse du vent de long des traces des satellites. Ces paramètres sont estimés à partir des échos radar qui possèdent une forme significative de la surface sur laquelle ils se réfléchissent. La précision, la résolution et la qualité de ces estimations sont des préoccupations permanentes pour "exploitation des mesures. Nous proposons dans cette thèse de réduire le niveau de bruit des mesures avant l'étape d'estimation c'est-à-dire sur les échos altimétriques. Pour cela, nous exploitons leur corrélation spatiale en travaillant sur des matrices d'échos consécutifs. Cette approche matricielle constitue une nouveauté dans le traitement du signal altimétrique. Son principal atout est de définir des sous-espaces vectoriels permettant d'isoler "information utile du bruit qui l'altère. Elle permet de définir des échos très peu bruités sans perdre l'information géophysique et avec une résolution maximale. Nous établissons un traitement optimal au sens des moindres carrés en s'appuyant sur des simulations et une validation sur les données réelles de plusieurs altimètres. Grâce aux échos débruités obtenus, les paramètres géophysiques sont extraits avec une précision accrue. En réduisant le bruit haute fréquence, nous mettons en évidence une variabilité spatiale plus fine échelle, jusqu'à présent noyée dans le bruit de mesure. Cette méthode simple et efficace permet d'affiner la précision et la résolution des paramètres estimés le long des traces des satellites.
Author: Télesphore Sime-Ngando
Publisher: Springer
ISBN: 3319399616
Category : Science
Languages : en
Pages : 422
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Book Description
This book represents the first multidisciplinary scientific work on a deep volcanic maar lake in comparison with other similar temperate lakes. The syntheses of the main characteristics of Lake Pavin are, for the first time, set in a firmer footing comparative approach, encompassing regional, national, European and international aquatic science contexts. It is a unique lake because of its permanently anoxic monimolimnion, and furthermore, because of its small surface area, its substantially low human influence, and by the fact that it does not have a river inflow. The book reflects the scientific research done on the general limnology, history, origin, volcanology and geological environment as well as on the geochemistry and biogeochemical cycles. Other chapters focus on the biology and microbial ecology whereas the sedimentology and paleolimnology are also given attention. This volume will be of special interest to researchers and advanced students, primarily in the fields of limnology, biogeochemistry, and aquatic ecology.
Author: Antony Joseph
Publisher: Newnes
ISBN: 0123914280
Category : Science
Languages : en
Pages : 447
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Book Description
Measuring Ocean Currents: Tools, Technologies, and Data covers all major aspects of ocean current measurements in view of the implications of ocean currents on changing climate, increasing pollution levels, and offshore engineering activities. Although more than 70% of the Earth is covered by ocean, there is limited information on the countless fine- to large-scale water motions taking place within them. This book fills that information gap as the first work that summarizes the state-of-the-art methods and instruments used for surface, subsurface, and abyssal ocean current measurements. Readers of this book will find a wealth of information on Lagrangian measurements, horizontal mapping, imaging, Eulerian measurements, and vertical profiling techniques. In addition, the book describes modern technologies for remote measurement of ocean currents and their signatures, including HF Doppler radar systems, satellite-borne sensors, ocean acoustic tomography, and more. Crucial aspects of ocean currents are described in detail as well, including dispersion of effluents discharged into the sea and transport of beneficial materials—as well as environmentally hazardous materials—from one region to another. The book highlights several important practical applications, showing how measurements relate to climate change and pollution levels, how they affect coastal and offshore engineering activities, and how they can aid in tsunami detection. - Coverage of measurement, mapping and profiling techniques - Descriptions of technologies for remote measurement of ocean currents and their signatures - Reviews crucial aspects of ocean currents, including special emphasis on the planet-spanning thermohaline circulation, known as the ocean's "conveyor belt," and its crucial role in climate change
Author: Collectif
Publisher: IRD Éditions
ISBN: 2709922207
Category : Nature
Languages : en
Pages : 736
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Book Description
This book has been published by Allenvi (French National Alliance for Environmental Research) to coincide with the 22nd Conference of Parties to the United Nations Framework Convention on Climate Change (COP22) in Marrakesh. It is the outcome of work by academic researchers on both sides of the Mediterranean and provides a remarkable scientific review of the mechanisms of climate change and its impacts on the environment, the economy, health and Mediterranean societies. It will also be valuable in developing responses that draw on “scientific evidence” to address the issues of adaptation, resource conservation, solutions and risk prevention. Reflecting the full complexity of the Mediterranean environment, the book is a major scientific contribution to the climate issue, where various scientific considerations converge to break down the boundaries between disciplines.
Author: Stephan Krall
Publisher: Springer Science & Business Media
ISBN: 9783764354428
Category : Technology & Engineering
Languages : en
Pages : 560
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Book Description
In the late eighties large-scale control operations were carried out to control a major desert locust upsurge in Africa. For the first time since the banning of organochlorine pesticides these operations relied mainly on non-persistent pesticides such as organophosphates and pyrethroids. The amount of pesticides sprayed and the area covered were probably the highest in the history of locust control and raised criticism with respect to efficacy, economic viability and environmental impact. As a consequence, applied research into the problem was intensified, both at the national and the international level, with the goal of finding new and environmentally sound approaches and solutions to locust and grasshopper control. Emphasis was laid on developing new control agents and techniques.
Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Mission Systems Panel. Symposium
Publisher:
ISBN:
Category : Command and control systems
Languages : en
Pages : 202
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Book Description
Author: Fernando P¿rez Font¿n
Publisher: John Wiley & Sons
ISBN: 0470751738
Category : Technology & Engineering
Languages : en
Pages : 268
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Book Description
A practical tool for propagation channel modeling with MATLAB® simulations. Many books on wireless propagation channel provide a highly theoretical coverage, which for some interested readers, may be difficult to follow. This book takes a very practical approach by introducing the theory in each chapter first, and then carrying out simulations showing how exactly put the theory into practice. The resulting plots are analyzed and commented for clarity, and conclusions are drawn and explained from the obtained results. Key features include: A unique approach to propagation channel modeling with accompanying MATLAB® simulations to demonstrate the theory in practice Contains step by step commentary and analysis of the obtained simulation results in order to provide a comprehensive and structured learning tool Covers a wide range of topics including shadowing effects, coverage and interference, Multipath Narrowband channel, Multipath Wideband channel, propagation in micro and pico-cells, the land mobile satellite (LMS) channel, the directional Multipath channel and MIMO and propagation effects in fixed radio links (terrestrial and satellite) The book comes with an accompanying website that contains the MATLAB® simulations and allows readers to try them out themselves Well suited for lab-use, as reference and as a self-learning tool both for advanced students and professionals Modeling the Wireless Propagation Channel: A simulation approach with MATLAB® will be best suited for postgraduate (Masters and PhD) students and practicing engineers in telecommunications and electrical engineering fields, who are seeking to familiarise themselves with the topic without too many formulas. The book will also be of interest to network engineers, system engineers and researchers
Author: Gert A. Schultz
Publisher: Springer Science & Business Media
ISBN: 3642595839
Category : Science
Languages : en
Pages : 498
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Book Description
The book provides comprehensive information on possible applications of remote sensing data for hydrological monitoring and modelling as well as for water management decisions. Mathematical theory is provided only as far as it is necessary for understanding the underlying principles. The book is especially timely because of new programs and sensors that are or will be realised. ESA, NASA, NASDA as well as the Indian and the Brazilian Space Agency have recently launched satellites or developed plans for new sensor systems that will be especially pertinent to hydrology and water management. New techniques are presented whose structure differ from conventional hydrological models due to the nature of remotely sensed data.
Author: Alison Sharrock
Publisher:
ISBN: 9781383005493
Category : Didactic poetry, Latin
Languages : en
Pages : 0
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Book Description
"The Art of Love" or "Ars Amatoria" is a poem about sex as poetry, and poetry as sex. This reading of the poem focuses on the relationship between the poet and reader, the lover and the seduced - both here and elsewhere in Latin poetry. The book translates all Latin quotations.
Author: Sven Boermeester
Publisher:
ISBN: 9781949677072
Category :
Languages : en
Pages :
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Book Description
Innovate Bristol highlights and celebrates those companies and individuals that are actively working at building a better tomorrow for all. Innovation Ecosystems thrive through the involvement and support of companies and individuals from all industries, which is why the Innovate series not only focuses on the innovators but also those people whom the Innovation Ecosystem, would not be able to thrive without.
