Searched for: subject%3A%22satellite%22
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Follis, Patrick (author)
Maximum Power Point Tracking (MPPT) is commonly used to optimize the power output of solar arrays for LEO satellites. Traditional MPPT techniques such as Perturb & Observe often struggle when the satellite is rotating and the temperature and incident irradiance are rapidly changing. This scenario frequently occurs with miniaturized...
master thesis 2024
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Orbons, Sander (author)
Future Very High-Throughput Satellites are foreseen to implement optical ground-to-satellite feeder links to achieve multi-terabit-per-second data rates. Optical links however, are highly susceptible to atmospheric losses caused by turbulence, absorption, and scattering, especially at low elevation angles. Despite prior confirmation of the...
master thesis 2024
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Kljaić, Korina (author)
The thesis focuses on creating a solution aimed at reducing suffering in earthquake prone regions. The research done resulted in the development of Embrace, a wearable communication device designed to alleviate human suffering during seismic events in seismically active regions like Zagreb. Commencing with an exploration of challenges faced by...
master thesis 2024
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Yarce Botero, A. (author)
When considering air quality, notably in South America, it seems that we are falling behind more developed regions in exacerbating the issue. This shortfall serves not just as observation, but as a warning, as air quality problems here are rapidly escalating. Nevertheless, by examining how other countries have addressed similar issues, we can...
doctoral thesis 2024
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Mast, Anne (author)
Sand waves can have a significant impact on offshore activities, and with the global push for sustainability and more renewable energy sources, these negative impacts will become more prevalent. Sand waves in the North Sea have a height up to a couple of meters and a wavelength between 100 and 1000 meters. The migration or change in asymmetry of...
master thesis 2024
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Gheorghiu, Irina (author)
Global Navigation Satellite System is a spatial data acquisition technique, mostly used in navigation and positioning. One of the main components of this technique is the satellite visibility, which refers to the connection between the satellite and the ground receiver. It is known that the GNSS positioning systems are not as performing in urban...
master thesis 2024
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El Hajj, Marcel M. (author), Steele-Dunne, S.C. (author), Almashharawi, Samer K. (author), Tian, X. (author), Johansen, Kasper (author), Camargo, Omar A.Lopez (author), Amezaga-Sarries, Adria (author), Mas-Vinolas, Andreu (author), McCabe, Matthew F. (author)
Soil moisture (SM) is an important state variable in land surface models. Here, we investigate the potential of a ground-based global navigation satellite system receiver with two linearly polarized antennas that measure the interference power (IP) of direct and reflected signals in horizontal polarization (H-pol) and vertical polarization (V...
journal article 2024
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Rowther, Sahl (author), Nealon, Rebecca (author), Meru, Farzana (author), Wurster, James (author), Aly, H.A. (author), Alexander, Richard (author), Rice, Ken (author), Booth, Richard A (author)
We carry out three-dimensional smoothed particle hydrodynamics simulations to study the role of gravitational and drag forces on the concentration of large dust grains (St > 1) in the spiral arms of gravitationally unstable protoplanetary discs, and the resulting implications for planet formation. We find that both drag and gravity play an...
journal article 2024
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Visser, P.M. (author), Eijt, S.W.H. (author), de Nijs, J.V. (author)
Context. Modified Newtonian dynamics (MOND) is a promising alternative to dark matter. To further test the theory, there is a need for fluid- and particle-dynamics simulations. The force in MOND is not a direct particle-particle interaction, but derives from a potential for which a nonlinear partial differential equation (PDE) needs to be...
journal article 2024
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Daras, I. (author), March, G. (author), Pail, R. (author), Hughes, C. W. (author), Braitenberg, C. (author), Guntner, A. (author), Eicker, A. (author), Wouters, B. (author), Heller-Kaikov, B. (author)
The joint ESA/NASA Mass-change And Geosciences International Constellation (MAGIC) has the objective to extend time-series from previous gravity missions, including an improvement of accuracy and spatio-temporal resolution. The long-term monitoring of Earth’s gravity field carries information on mass change induced by water cycle, climate...
journal article 2024
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Bockelée-Morvan, D. (author), Lellouch, E. (author), Poch, O. (author), Quirico, E. (author), Cazaux, S.M. (author), de Pater, I. (author), Fouchet, T. (author), Fry, P. M. (author), Rodriguez-Ovalle, P. (author)
Context. We present the first spectroscopic observations of Ganymede by the James Webb Space Telescope undertaken in August 2022 as part of the proposal "ERS observations of the Jovian system as a demonstration of JWST's capabilities for Solar System science". Aims. We aimed to investigate the composition and thermal properties of the surface...
journal article 2024
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Bij de Vaate, I. (author), Slobbe, D.C. (author), Verlaan, M. (author)
Multi-mission satellite altimetry data have been used to study the spatial and temporal variability in global storm surge water levels. This was done by means of a time-dependent extreme value analysis applied to the monthly maximum detided water levels. To account for the limited temporal resolution of the satellite data, the data were first...
journal article 2024
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Psychas, D.V. (author), Khodabandeh, A. (author), Teunissen, P.J.G. (author)
PPP-RTK corrections, aiding GNSS users to achieve single-receiver integer ambiguity-resolved parameter solutions, are often estimated in a recursive manner by a provider. Such recursive, multi-epoch, estimation of the corrections relies on a set of S-basis parameters that are chosen by the provider so as to make the underlying measurement...
journal article 2024
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Hernandez-Burgos, Sergi (author), Gibert, Ferran (author), Broquetas, Antoni (author), Kleinherenbrink, M. (author), De la Cruz, Adrian Flores (author), Gomez-Olive, Adria (author), Garcia-Mondejar, Albert (author), Aparici, Monica Roca i. (author)
The 2-D frequency-based omega-K method is known to be a suitable algorithm for fully focused SAR (FF-SAR) radar altimeter processors, as its computational efficiency is much higher than equivalent time-based alternatives without much performance degradation. In this article, we provide a closed-form description of a 2-D frequency-domain omega...
journal article 2024
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van Woerkom, Q.B. (author), Kleisioti, E. (author)
Context. Though efforts to detect them have been made with a variety of methods, no technique can claim a successful, confirmed detection of a moon outside the Solar System yet. Moon detection methods are restricted in capability to detecting moons of masses beyond what formation models would suggest, or they require surface temperatures...
journal article 2024
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Song, Yanjie (author), Ou, Junwei (author), Pedrycz, Witold (author), Suganthan, Ponnuthurai Nagaratnam (author), Wang, X. (author), Xing, Lining (author), Zhang, Yue (author)
Multitype satellite observation, including optical observation satellites, synthetic aperture radar (SAR) satellites, and electromagnetic satellites, has become an important direction in integrated satellite applications due to its ability to cope with various complex situations. In the multitype satellite observation scheduling problem ...
journal article 2024
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Fayolle-Chambe, M.S. (author), Dirkx, D. (author), Cimo, G. (author), Gurvits, L. (author), Lainey, V. (author), Visser, P.N.A.M. (author)
In the coming decade, JUICE and Europa Clipper radio-science will yield the most accurate estimation to date of the Galilean moons’ physical parameters and ephemerides. JUICE's PRIDE (Planetary Radio Interferometry and Doppler Experiment) will help achieve such a solution by providing VLBI (Very Long Baseline Interferometry) observations of...
journal article 2024
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Zenk, Kai (author)
Owing to the assumed presence of sub-surface oceans, the Galilean satellites - Io, Europa, Ganymede, and Callisto - are among the most promising candidates for potential extraterrestrial habitats within our Solar System. To this end, the moons are going to be extensively studied by the upcoming JUICE and Europa Clipper missions. Ultimately,...
master thesis 2023
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Srikanth, Vikram (author)
Small satellite systems such as CubeSats and PocketQubes have strict requirements in terms of size, weight, and power available onboard. In light of these constraints, small satellite systems typically omit the inclusion of a ranging system due to its power and specialized hardware requirements. However, new research in satellite ranging...
master thesis 2023
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Palings, Tijs (author)
As space technology continues to advance, the landscape of telecommunication is witnessing a transition from traditional radio frequency to laser communication technology, driven by its enhanced efficiency. Notably, laser communication offers the potential for achieving millimeter-level ranging accuracy, thanks to its significantly higher data...
master thesis 2023
Searched for: subject%3A%22satellite%22
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