Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 32 for “"European Space Agency"”.
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Optical and Quasi-Optical Design and Analysis of Astronomical Instrumentation including a Prototype SAFARI Pixel
… work were a Technology Research Programme of the European Space Agency, the optical payload design of the future proposed Space Infrared-Telescope for Cosmology and Astrophysics mission and work on the Atacama Large Millimeter Array. Once the simulation tools were developed and proven an analysis …
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Formal failure analyses for effective fault management: an aerospace perspective
… in collaboration with engineers from the European Space Agency, demonstrating the practicality of the contributions.
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Multilayer Micromachined RF MEMS Filters at Ka and L/S Band For On-Board Satellite Communication Systems
… The work has been inspired and supported by the European Space Agency (ESA) Contract No. 22706/09/NL/GLC of the ARTES 5 Workplan 2008 “Micro-machined Filters in Multi-layer Technology for Satellite On-board Communication Systems†(MIGNON Project). The main purpose of the project is the …
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Novel Design Solutions for High Reliability RF MEMS Switches
… System (MEMS) switches for space applications. The work was inspired and supported by the European Space Agency (ESA) Contract No. ITT AO/1-5288/06/NL/GLC ?High Reliability Redundancy Switch?. The main purpose of the project is the design and realization of high-reliability …
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A Formal Foundation of FDI Design via Temporal Epistemic Logic
… Motivated by industrial case-studies from the European Space Agency, this thesis proposes a formal foundation for FDI design that covers specification, validation, verification, and synthesis. The Alarm Specification Language (ASLk) is introduced in order to formally capture a set of …
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Comparison of Random Forests, Support Vector Machine and Artificial Neural Network Methods for Agriculture Land Cover Classification
… Sentinel-2, which is a publicly data from the European Space Agency. In total, 133,080 samples were analyzed using stratified random sampling, divided into training (70%) and test (30%) subsets. The accuracy is assessed by a variety of indicators. It is found that RF has the highest overall …
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Data acquisition and control system for the OLYMPUS propagation experiments
… with the OLYMPUS satellite. OLYMPUS is a European Space Agency experimental satellite that broadcasts coherent at 12, 20 and 30 GHz and is viewed from Blacksburg, Virginia at an elevation angle of 13.9°. This low elevation angle yields a relatively long atmospheric path which serves to …
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Decision tree application to satellite measurement and analysis of exospheric neutral densities
… are generally two types of models to simulate space science parameters: physics-based models and statistics-based models. The first type of model makes predictions based on physical assumptions and mathematical expressions. The second type does so based on past data, applying linear regression …
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Analysis and Measurement of Horn Antennas for CMB Experiments
… of the High Frequency Instrument (HFI) of the European Space Agency (ESA) Planck satellite using mode matching techniques to model their farfield beam patterns. To undertake this analysis the existing in-house software was upgraded to address issues associated with the stability of the …
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Electromagnetic Techniques for Analysis and Design of Ultra Sensitive Receivers for Far-Infrared Astronomy
… Spica Far-Infrared Instrument) on the proposed space based telescope SPICA (Space Infrared Telescope for Cosmology and Astrophysics). The computational methods required for modelling SAFARI-like receivers are described, and sophisticated conical waveguide mode matching theory is derived. Generic …
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Designing a safety management support system using open architecture databases: the requirements of information representation in the support of managers' risk-related decision-making
This research was conducted at the Space Research and Technology Centre o the European Space Agency at Noordvijk in the Netherlands. ESA is an international organisation that brings together a range of scientists, engineers and managers from 14 European member states. The motivation for the work …
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Source modelling at the dawn of gravitational-wave astronomy
… has begun. Gravitational waves are propagating spacetime perturbations ($\textit{“ripples in the fabric of space-time”}$) predicted by Einstein’s theory of General Relativity. These signals propagate at the speed of light and are generated by powerful astrophysical events, such as the merger of …
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Conceptos relacionados con estrella. Lingüística de corpus de astronomía
… words: a text of Astronomy made by the Hubble European Space Agency Information Centre (ESA/ESO) for Secondary Education. The frequency data of the lexical units obtained with the PAFE software is used to propose a mathematical way of obtaining frequent vocabularies based on the analysis of the …
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Accurate Characterisation of Refractive Components for Future CMB Missions
… dielectric lenses. These were made as part of a European Space Agency contract to further the refractive technology in the terahertz band of the frequency spectrum. Two different types of prototype lens were made for this project in Cardiff University and testing performed at Maynooth University …
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Validation and application of the MERIS Terrestrial Chlorophyll Index.
… climatic change at local to global scales. The European Space Agency (ESA) uses data recorded by the Medium Resolution Imaging Spectrometer (MERlS) in red I near infrared spectral bands to produce an operational product called the MERlS Terrestrial Chlorophyll Index (MTCI). The MTCI is related …
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‘Powellsnakes’, a fast Bayesian approach to discrete object detection in multi-frequency astronomical data sets
… successfully applied the methodology to ESA’s (European Space Agency) Planck satellite data [Planck Collaboration et al., 2011d]. This data set is large, complex and typical of the contemporary precision observational cosmology state-of-the-art. Two catalogue products are already released: (i) A …
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Satellite Constellation Optimization for In-Situ Sampling and Reconstruction of Tides in the Thermospheric Gap
… for predicting atmospheric shifts relevant for spaceflight, the evolution of Earth's climate, radio communications, and other practical applications. In-situ observations of a critical altitude region within Earth's atmosphere from 100-200 km in altitude, a subset of a larger 90 – 400 km …
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System of Systems conceptual design methodology for space exploration
… tools, to support the decision makers during the space exploration scenarios design and evaluation activity in line with the concurrent design philosophy. Considering all combinations of system parameters (such as crew size, orbits, launchers, spacecraft, ground and space infrastructures), a large …
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