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Frijns, Jesper (author)Laser satellite communications for ground-to-ground and ground-to space links is influenced by atmospheric turbulence. Typically, theoretical models are used to predict link performance and the influence of the atmosphere on variables such as beam wander, spot size and scintillation at the receiver. These variables are used as input for system...master thesis 2023
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van Capel, Michaja (author), Chontos, Christos (author), Gheorghiu, Irina (author), Mbwanda, Tendai (author)<br/>The NMCAs (National Mapping and Cadastral Agencies) of European countries have different cadastral survey accuracy standards (European Global Navigation Satellite Systems Agency, 2019). In order to meet these standards, the appropriate equipment and services should be determined. The augmentation service Galileo High Accuracy Service (HAS),...student report 2023
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Narayana, S. (author)The Internet of Things (IoT), a recent technology that has enabled many innovative applications, has dominated the world by creating smart systems and applications. It is predicted that the number of connected gadgets in IoT will double by 2030 compared to 2020. Thus, it is essential to address the key challenges, such as scalability, ubiquitous...doctoral thesis 2023
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Haakman, Koen (author)Ocean currents play a crucial role in many scientific and industrial applications. Contemporary measurement techniques are limited in spatial coverage or spatial resolution. This study presents a proof-of-concept for a new measurement principle that merges optical satellite imagery of Kelvin wakes with data from the Automatic Identification...master thesis 2023
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Oberg, N.O. (author), Kamp, I. (author), Cazaux, S.M. (author), Rab, Ch (author), Czoske, O. (author)Context. Gaining a full understanding of the planet and moon formation process calls for observations that probe the circumplanetary environment of accreting giant planets. The mid-infrared ELT imager and spectrograph (METIS) will provide a unique capability to detect warm-gas emission lines from circumplanetary disks. Aims. We aim to...journal article 2023
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Veefkind, j. Pepijn (author), Serrano Calvo, R. (author), de Gouw, J. (author), Dix, B. (author), Schneising, O. (author), Buchwitz, M. (author), Barré, J. (author), van der A, R. J. (author), Liu, M. (author), Levelt, Pieternel Felicitas (author)Emissions of methane (CH<sub>4</sub>) in the Permian basin (USA) have been derived for 2019 and 2020 from satellite observations of the Tropospheric Monitoring Instrument (TROPOMI) using the divergence method, in combination with a data driven method to estimate the background column densities. The resulting CH<sub>4</sub> emission data,...journal article 2023
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Simons, W.J.F. (author), Naeije, M.C. (author), Ghazali, Zaki (author), Darani Rahman, Wan (author), Cob, Sanusi (author), Kadir, Majid (author), Bin Mustafar, M.A. (author), Din, Ami Hassan (author), Efendi, Joni Efendi (author), Noppradit, Prakrit (author)Absolute sea-level rise has become an important topic globally due to climate change. In addition, relative sea-level rise due to the vertical land motion in coastal areas can have a big societal impact. Vertical land motion (VLM) in Southeast Asia includes a tectonically induced component: uplift and subsidence in plate boundary zones where...journal article 2023
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Khodabandeh, A. (author), Teunissen, P.J.G. (author), Psychas, D. (author)To obtain single-receiver Global Navigation Satellite System (GNSS) parameter solutions, the PPP-RTK user-filter combines measurements with time-correlated corrections that are separately computed by the filter of an external provider. The consequence of exercising such double-filtering is that the Kalman filter’s standard assumption of...journal article 2023
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Kartal, S. (author)Spatiotemporal time series prediction plays a crucial role in a wide range of applications. However, in most of the studies, spatial information was ignored and predictions were carried out either on a few points or on average values. In this study, 37 different configurations of 4 traditional ML models and 3 Neural Network (NN) based models...journal article 2023
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Khodabandeh, A. (author), Teunissen, P.J.G. (author)Carrier phase signals are considered among the key observations in global navigation satellite systems (GNSSs) and several other high-precision interferometric measurement systems. However, these ultra-precise measurements are not fully exploited when the integerness of their inherent ambiguities is discarded during the estimation process....journal article 2023
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Chang, Guobin (author), Qian, N. (author), Bian, Shaofeng (author)Point-mass inversion is widely employed in GRACE level-2 data processing. Conventionally, the spherical harmonic (SH) coefficients are used indirectly: a set of pseudo measurements is generated first using the SH coefficients through SH synthesis; then the point-mass inversion is done with these pseudo measurements. To be statistically optimal,...journal article 2023
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Estebanez Camarena, M. (author), Taormina, R. (author), van de Giesen, N.C. (author), ten Veldhuis, Marie-claire (author)Food and economic security in West Africa rely heavily on rainfed agriculture and are threatened by climate change and demographic growth. Accurate rainfall information is therefore crucial to tackling these challenges. Particularly, information about the occurrence and length of droughts as well as the onset date of the rainy season is...journal article 2023
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Hou, P. (author), Zha, Jiuping (author), Liu, Teng (author), Zhang, Baocheng (author)Precise point positioning-real-time kinematic (PPP-RTK), otherwise known as integer ambiguity resolution-enabled precise pointing positioning, has attracted much attention in recent years and has become state-of-the-art in the global navigation satellite system (GNSS) high-precision positioning community. This work reviews several PPP-RTK...journal article 2023
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Visser, P.M. (author)Context. In a Keplerian system, a large number of bodies orbit a central mass. Accretion disks, protoplanetary disks, asteroid belts, and planetary rings are examples. Simulations of these systems require algorithms that are computationally efficient. The inclusion of collisions in the simulations is challenging but important. Aims. We intend...journal article 2023
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Berthier, Etienne (author), Floriciou, Dana (author), Gardner, Alex (author), Gourmelen, Noel (author), Jakob, Livia (author), Paul, Frank (author), Treichler, Désirée (author), Wouters, B. (author), Belart, Joaquín M C (author)Glaciers distinct from the Greenland and Antarctic ice sheets are currently losing mass rapidly with direct and severe impacts on the habitability of some regions on Earth as glacier meltwater contributes to sea-level rise and alters regional water resources in arid regions. In this review, we present the different techniques developed during...review 2023
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Mahapatra, G. (author), Abiad, F. (author), Rossi, L. (author), Stam, D.M. (author)Context. Terrestrial-type exoplanets in or near stellar habitable zones appear to be ubiquitous. It is, however, unknown which of these planets have temperate, Earth-like climates or for example, extreme Venus-like climates. Aims. Technical tools to distinguish different kinds of terrestrial-type planets are crucial for determining whether a...journal article 2023
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Schreiter, Lucas (author), Stolle, Claudia (author), Rauberg, Jan (author), Kervalishvili, Guram (author), van den IJssel, J.A.A. (author), Arnold, Daniel (author), Xiong, Chao (author), Callegare, Andyara (author)Satellites in Low Earth Orbit (LEO) are essential for sounding the topside ionosphere. In this work, we present and validate a data set of Total Electron Content (TEC) and in situ electron density observations from the Gravity Recovery And Climate Experiment (GRACE) and GRACE-Follow-On missions as well as a TEC data set from the CHAllenging...journal article 2023
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Oberg, N.O. (author), Cazaux, S.M. (author), Kamp, I. (author), Bründl, T. (author), Thi, W. F. (author), Immerzeel, C. (author)Context. The subsurface oceans of icy satellites are among the most compelling among the potentially habitable environments in our Solar System. The question of whether a liquid subsurface layer can be maintained over geological timescales depends on its chemical composition. The composition of icy satellites is linked to that of the...journal article 2023
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Schlembach, Florian (author), Ehlers, F. (author), Kleinherenbrink, M. (author), Passaro, Marcello (author), Dettmering, Denise (author), Seitz, Florian (author), Slobbe, D.C. (author)Estimating the three geophysical variables significant wave height (SWH), sea surface height, and wind speed from satellite altimetry continues to be challenging in the coastal zone because the received radar echoes exhibit significant interference from strongly reflective targets such as sandbanks, sheltered bays, ships etc. Fully focused...journal article 2023
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Guarneri, H. (author), Verlaan, M. (author), Slobbe, D.C. (author), Veenstra, J. (author), Zijl, F. (author), Pietrzak, J.D. (author), Snellen, M. (author), Keyzer, L.M. (author), Afrasteh, Y. (author), Klees, R. (author)Both empirical and assimilative global ocean tidal models are significantly more accurate in the deep ocean than in shelf and coastal waters. In this study, we answered whether this is due to the quality of the models used to reduce tide and surge or the general approach to treat tide and surge as two separate components of the water level...journal article 2023