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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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Brouwer, W.S. (author), Hanssen, R.F. (author)The estimation of displacement vectors for (objects on) the Earth's surface using satellite InSAR requires geometric transformations of the observables based on orbital viewing geometries. Usually, there are insufficient viewing geometries available for full 3-D reconstruction, leading to nonunique solutions. Currently, there is no...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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Estebanez Camarena, M. (author), Curzi, Fabio (author), Taormina, R. (author), van de Giesen, N.C. (author), ten Veldhuis, Marie-claire (author)West African food systems and rural socio-economics are based on rainfed agriculture, which makes society highly vulnerable to rainfall uncertainty and frequent floods and droughts. Reliable rainfall information is currently missing. There is a sparse and uneven rain gauge distribution and, despite continuous efforts, rainfall satellite products...journal article 2023
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Hart-Davis, Michael G. (author), Laan, Stendert (author), Schwatke, Christian (author), Backeberg, Björn (author), Dettmering, Denise (author), Zijl, Firmijn (author), Verlaan, M. (author), Passaro, Marcello (author), Seitz, Florian (author)With the continued rise in global mean sea level, operational predictions of tidal height and total water levels have become crucial for accurate estimations and understanding of sea level processes. The Dutch Continental Shelf Model in Delft3D Flexible Mesh (DCSM-FM) is developed at Deltares to operationally estimate the total water levels...journal article 2023
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Vaughan, Sophia R. (author), Gebhard, Timothy D. (author), Cowan, N.J.P. (author), Doelman, D.S. (author), Kenworthy, M.A. (author), Trees, V.J.H. (author), Stam, D.M. (author), Brandl, B.R. (author), Kleisioti, E. (author)NASA is engaged in planning for a Habitable Worlds Observatory (HabWorlds), a coronagraphic space mission to detect rocky planets in habitable zones and establish their habitability. Surface liquid water is central to the definition of planetary habitability. Photometric and polarimetric phase curves of starlight reflected by an exoplanet can...journal article 2023
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Kleisioti, E. (author), Dirkx, D. (author), Rovira Navarro, M. (author), Kenworthy, M.A. (author)Context. Exomoons are expected to orbit gas giant exoplanets just as moons orbit Solar System planets. Tidal heating is present in Solar System satellites, and it can heat up their interior, depending on their orbital and interior properties. Aims. We aim to identify a tidally heated exomoon's (THEM) orbital parameter space that would make it...journal article 2023
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Narin, O.G. (author), Gullu, Mevlut (author)Digital elevation models (DEM) are an essential data source in many professional disciplines, with the help of gridded height information and values such as slope and aspect produced from that information. In this study, Ice, Cloud and land Elevation Satellite-2 (ICESat-2) and Global Ecosystem Dynamics Investigation (GEDI) satellite-altimetry...journal article 2023
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Serrano Calvo, R. (author), Veefkind, j. Pepijn (author), Dix, Barbara (author), de Gouw, Joost (author), Levelt, Pieternel Felicitas (author)COVID-19 caused a historic collapse in fossil fuel demand, a general decline in economic activity, and hydrocarbon price volatility. This resulted in an unprecedented scenario to evaluate the contribution of the O&G (Oil and Gas) industry NO<sub>2</sub> (nitrogen dioxide) emissions in the Permian basin (United States), currently the...journal article 2023
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Fayolle-Chambe, M.S. (author), Lainey, V. (author), Dirkx, D. (author), Gurvits, L. (author), Cimo, G. (author), Bolton, S. J. (author)Context. Stellar occultations currently provide the most accurate ground-based measurements of the positions of natural satellites (down to a few kilometres for the Galilean moons). However, when using these observations in the calculation of satellite ephemerides, the uncertainty in the planetary ephemerides dominates the error budget of the...journal article 2023
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Fayolle-Chambe, M.S. (author), Magnanini, A. (author), Lainey, V. (author), Dirkx, D. (author), Zannoni, M. (author), Tortora, P. (author)Context. The upcoming JUICE and Europa Clipper missions targeting Jupiter s Galilean satellites will provide radio science tracking measurements of both spacecraft. Such data are expected to significantly help estimating the moons ephemerides and related dynamical parameters (e.g. tidal dissipation parameters). However, the two missions will...journal article 2023
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Broekens, K.A. (author), Klop, Wimar (author), Moens, Thijs (author), Eschen, M. (author), Castro do Amaral, G. (author), Silverstri, Fabrizio (author), Visser, Martijn (author), Kaffa, Lauren (author), Saathof, R. (author)For the next generation of very high throughput communication satellites, free-space optical (FSO) communication between ground stations and geostationary telecommunication satellites is a potential solution to overcome the limitations of RF links. To mitigate atmospheric turbulence effects, TNO proposes Adaptive Optics (AO) to apply uplink...conference paper 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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Regnerija, Kim S.C.N.A. (author), Bagchus, F.M. (author), Speretta, S. (author), Uludag, M.S. (author)The Da Vinci Satellite project is a non-profit initiative started at the Delft University of Technology to inspire and enthuse the youth to learn more about technology and space travel. The team does this by focussing on demystifying space and making it a fun and engaging subject. The non-profit student team is divided into different sub teams,...conference paper 2023
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Turan, E. (author), Speretta, S. (author), Gill, E.K.A. (author)In recent years, there has been a growing interest in lunar missions, particularly with the growing role of small satellites facilitated by piggyback launch opportunities. Typically, ground-based radiometric tracking is the workhorse to establish the necessary navigation solution in these missions, however, this could be expensive, while small...conference paper 2023
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Theodosiou, A. (author), Kleinherenbrink, M. (author), López-Dekker, Paco (author)Estimating sea surface height using cross-track interferometry (XTI) requires high sensitivity because the ocean surface signal is in the order of 10 cm. In addition, the interferometer requires a temporal delay of a few milliseconds to ensure the coherency of the moving ocean surface. We show that a squinted line of sight (LoS), in...journal article 2023
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Piaggio, Benedetto (author), Garofano, V. (author), Donnarumma, Silvia (author), Alessandri, Angelo (author), Negenborn, R.R. (author), Martelli, Michele (author)A novel follow-the-leader approach for azimuth-driven vessels is devised and experimentally tested in a model-scale outdoor scenario. The vessels are equipped with global navigation satellite and inertial navigation systems. A line-of-sight algorithm ensures the yaw-check ability of the follower vessel along the leader's path, while a speed...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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Yan, Jingye (author), Wu, Ji (author), Gurvits, L. (author), Wu, Lin (author), Deng, Li (author), Zhao, Fei (author), Zhou, Li (author), Lan, Ailan (author), Fan, Wenjie (author)This paper introduces the first results of observations with the Ultra-Long-Wavelength (ULW) —- Low Frequency Interferometer and Spectrometer (LFIS) on board the selenocentric satellite Longjiang-2. We present a brief description of the satellite and focus on the LFIS payload. The in-orbit commissioning confirmed a reliable operational status...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