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Nitijevskis, Arsenijs (author)The railway industry is constantly growing to meet the demand of society for stable, accessible and sustainable transportation. With this growth, the need for the railway to be reliable increases, requiring frequent surveying and maintenance. Fugro's RILA (Rail Infrastructure aLignment Acquisition) mobile mapping system contributes by making the...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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Gill, E.K.A. (author), Akos, D. M. (author)This paper proposes a novel concept of using highly efficient Snapshot Global Navigation Satellite Systems (GNSS) receivers to provide precise position fixes of single or multiple satellites in Low-Earth Orbit (LEO) to improve upper atmospheric modeling and thus contribute to superior space situational awareness (SSA). While tracking of LEO...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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Hehenberger, S.P. (author), Caizzone, Stefano (author), Yarovoy, Alexander (author)The utilization of low-cost hybrid additive manufacturing equipment for creating a fully integrated patch antenna system is demonstrated. A miniaturized stacked dual-band patch antenna for GNSS applications with integrated feed, amplifier, matching, and bias network is considered. Design and manufacturing challenges due to the peculiarities of...conference paper 2024
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Siemes, C. (author), van den IJssel, J.A.A. (author), Visser, P.N.A.M. (author)Thermosphere mass density and crosswind can be derived from accelerometer and GNSS tracking data. However, present datasets are often provided without comprehensive uncertainty specifications. We present a newly developed method that propagates measurement noise and errors in the satellite specification, thermosphere models, and radiation flux...journal article 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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Khodabandeh, A. (author), Teunissen, P.J.G. (author)To accommodate the presence of bounded biases in mixed-integer models, Khodabandeh (2022) extended integer estimation theory by introducing a new admissible integer estimator. The estimator follows the principle of integer least squares estimation and is computed via the integer search method of BEAT. In this contribution, we present the...journal article 2024
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Salehi-Dorcheabedi, Milad (author), Asgari, Jamal (author), Amiri Simkooei, A. (author), Fatemi Nasrabadi, Sayyed Bagher (author)Although Light Detection and Ranging (LiDAR) technology is currently one of the most efficient methods for acquiring high-density point cloud, there are still challenges in terms of data reliability. In particular, the accuracy assessment of LiDAR data, especially in the height component, is one of the main issues in this context. This study...journal article 2024
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Hiemstra, Jolijn (author), Streefkerk, Luuk (author), Okkerman, Jorrit (author), Rijsenbrij, Annabel (author), van Leeuwen, Jesse (author), Linnebach, Jonathan (author)In a Ghana project, field measurements at the Black Volta aimed to enhance hydrological predictions for the Bui power dam. Validating devices and exploring floodplain contributions, such as with GNSS reflectometry and cameras, provides crucial insights for dam management and model improvement.<br/><br/>In this multidisciplinary project,...student report 2023
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Samboko, H.T. (author)The unavailability of consistent accurate river flow data is a significant impediment to understanding water resources availability, and hydrological extremes. This is particularly true for remote, difficult to access, morphologically active and therefore rapidly changing rivers. The state of global river discharge monitoring with respect to...doctoral thesis 2023
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Salas Lasala, María (author)The Event Horizon Telescope (EHT) is a global array of telescopes that employs Very Long Baseline Interferometry (VLBI) techniques to image the event horizon of black holes. To overcome the limitations of ground-based telescopes, this thesis explores the mission concept involving a two-satellite constellation of space-borne telescopes deployed...master thesis 2023
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Collot d'Escury, Frederik (author)Railway transportation is crucial to reducing greenhouse gas emissions and meeting increasing global demand for passenger and freight transport. To maintain a reliable, high-capacity railway infrastructure, regular and accurate maintenance is necessary. The recent development of a Rail-based Track<br/>Surveying System that can be mounted on any...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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Paliušis, Kipras (author)Laser communication provides numerous benefits over typical Radio Frequency communication, such as lower power, not occupying regulated frequency bands, possibilities for much higher data rates and resistance to jamming. Combined with satellite constellations, Laser Inter-satellite Links (LISL) can enable global connectivity. However, satellites...master thesis 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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Porkoláb, Kristóf (author), Broerse, D.B.T. (author), Kenyeres, Ambrus (author), Békési, Eszter (author), Tóth, Sándor (author), Magyar, B. (author), Wesztergom, Viktor (author)The Pannonian basin is an extensional back-arc basin that has undergone neotectonic inversion and is currently shortening. The understanding and quantification of present-day deformation processes during this inversion are still incomplete. To this end, we investigate the active deformation of the Circum-Pannonian region via the interpolation of...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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Klees, R. (author), Slobbe, D.C. (author)This paper investigates the full variance–covariance (VC) matrix of two high-resolution regional quasi-geoid models, utilizing a spherical radial basis function parameterization. Model parameters were estimated using weighted least-squares techniques and variance component estimation (VCE) for data weighting. The first model, known as the ...journal article 2023
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Gill, E.K.A. (author), Morton, Jade (author), Axelrad, Penina (author), Akos, Dennis M. (author), Centrella, M. (author), Speretta, S. (author)Spaceborne Global Navigation Satellite Systems (GNSS) receivers have become ubiquitous sensors for spacecraft navigation, especially in Low Earth Orbits (LEOs), often also supporting science endeavors or as acting dedicated science payloads. Due to the large number of space-capable GNSS receiver models available, spacecraft designers, as well as...journal article 2023