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Picone, S. (author), Bloemendal, Martin (author), Pellegrini, M. (author), Hoekstra, N. (author), Andreu Gallego, A. (author), Rodriguez Comins, J. (author), Murrel, A. (author)Aquifer Thermal Energy Storage (ATES) system make use of the groundwater to exchange energy with the building: in winter, groundwater is pumped from the warm well to the buildings heat exchanger and the building extracts heat from the groundwater as energy source for the heat pumps, while the groundwater will be injected in the cold well at...conference paper 2019
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Hoekstra, J.S.C.M. (author)International comparative housing research usually takes countries as a unit of analysis. Studies in the field typically connect housing outcomes at the national level to national welfare state and housing regimes. However, as a result of both supranational developments (globalization, financialization, neoliberalization, European Union...conference paper 2019
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Roosenbrand, E.J. (author), Sun, Junzi (author), Dedoussi, I.C. (author), Stam, D.M. (author), Hoekstra, J.M. (author)Sustainability is the biggest challenge facing the aerospace industry today. With the global number of flights expected to rise, the climate impact of aviation will continue to increase. Current research states that the rerouting of aircraft through wind-optimisation for the purpose of fuel usage minimisation and emission reduction is an...conference paper 2022
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Groot, D.J. (author), Ribeiro, M.J. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Current estimates show that the presence of unmanned aviation is likely to grow exponentially over the course of the next decades. Even with the more conservative estimates, these expected high traffic densities require a re-evaluation of the airspace structure to ensure safe and efficient operations. One structure that scored high on both the...conference paper 2022
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Doole, M.M. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)The concept of autonomous drone delivery in urban areas has gained a favorable amount of media attention over the past few years. Companies such as Amazon, Uber and Matternet are investigating the use of drones to transport parcels in order to solve the disaggregate delivery (last-mile) problem. This solution could potentially reduce vehicular...conference paper 2018
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Badea, C. (author), Groot, D.J. (author), Morfin Veytia, A. (author), Ribeiro, M.J. (author), Dalmau, Ramon (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Air traffic demand has increased at an unprecedented rate in the last decade (albeit interrupted by the COVID pandemic), but capacity has not increased at the same rate. Higher levels of automation and the implementation of decision-support tools for air traffic controllers could help increase capacity and catch up with demand. The air traffic...conference paper 2022
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Morfin Veytia, A. (author), Badea, C. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author), Patrinopoulou, N. (author), Daramouskas, I. (author), Lappas, V. (author), Kostopoulos, Vassilis (author), de Vries, Vincent (author)The Metropolis II project aimed to study the impact of centralised separation management for urban aerial mobility. Three concepts were developed in this study: a fully centralised, strategically separated concept, a hybrid concept featuring cen- tralised strategic separation and distributed tactical separation, and a fully distributed tactical...conference paper 2022
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Maas, J.B. (author), van Gent, R.N.H.W. (author), Hoekstra, J.M. (author)Object tracking is performed when surveillance applications have multiple observations of an object over time. An example of such a surveillance application is mounting a wideangle Frequency Modulated Continuous Wave (FMCW) radar system on board of a General Aviation aircraft. This is done in order to observe its environment in detail, including...conference paper 2018
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Maas, J.B. (author), Stefanovici, V. (author), van Gent, R.N.H.W. (author), Hoekstra, J.M. (author)Many pilots in General Aviation use electronic add-ons aids in flight, which rely on satellite navigation information. This navigation information is often a single point of failure which is undesirable since the pilot relies on the information. This paper presents the results of research whether a novel mobile radar station can be used to...conference paper 2020
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Maas, J.B. (author), van Gent, R.N.H.W. (author), Hoekstra, J.M. (author)Although the main goal of a newly developed Collision Alert Radar is to observe airborne targets, it was found that reflections of the ground are received by the radar. The radar is carried on board of the aircraft, and the ground reflections may be used to detect flight information with respect to the terrain, something which is not possible...conference paper 2020
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Roosenbrand, E.J. (author), Sun, Junzi (author), Hoekstra, J.M. (author)One of the biggest challenges facing the aerospace industry today is its sustainability. As the number of flights is expected to rise globally, aviation’s climate impact will continue to increase. Current research has extensively addressed the rerouting of aircraft through wind-optimization in order to minimize fuel burn and emissions. Such...conference paper 2022
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- Jenie, Y.I. (author), van Kampen, E. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author) conference paper 2016
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Sun, Junzi (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Open access to flight data from ADS-B (Automatic Dependent Surveillance Broadcast) has provided researchers more insights for air traffic management than aircraft tracking alone. With large quantities of trajectory data collected from a wide range of different aircraft types, it is possible to extract accurate aircraft performance parameters....conference paper 2017
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Sun, Junzi (author), Blom, H.A.P. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)This paper focuses on estimating aircraft mass and thrust setting using a recursive Bayesian method called particle filtering. The method is based on a nonlinear state-space system derived from aircraft point-mass performance models. Using solely ADS-B and Mode-S data, flight states such as position, velocity, and wind speed are collected and...conference paper 2018
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Sunil, E. (author), Þórđarson, Olafur (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)Decentralized en-route airspace concepts have been proposed by many studies to increase airspace safety and capacity. Most of these studies, including our own forays into this domain, have used fast-time simulation experiments to explore the benefits offered by decentralization. While simulations are indispensable during the initial design phase...conference paper 2018
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Ellerbroek, Joost (author), Inaad, Mazin (author), Hoekstra, J.M. (author)This paper presents an analysis of the potential fuel and emission benefits of implementing Continuous Descent Operations at Schiphol International Airport, from cruise altitude to the final approach fix, for a large scope of aircraft types. Using historical data from on-board sources and ADS-B, fuel-optimal continuous descents are simulated...conference paper 2018
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Hoekstra, J.M. (author), Ellerbroek, Joost (author), Sunil, E. (author), Maas, J.B. (author)Both U-space in Europe, as well as UTM in the USA, develop concepts and tools for UAV airspace. Enabling highdensity operations is one of the goals of these studies. Past and recent studies have analysed which factors affect the capacity of a UAV airspace. An improved understanding of this can lead to control methods for capacity management. Two...conference paper 2018
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Sunil, E. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)This paper presents a semi-empirical method to determine the maximum theoretical capacity of decentralized airspace concepts. The method considered here, named Capacity Assessment Method for Decentralized ATC (CAMDA), formalizes an earlier approach described in literature, extends it for threedimensional airspace, and also improves the accuracy...conference paper 2018
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Dol, C.P. (author), Hoekstra, J.S.C.M. (author)The ageing of European societies and increasing pressure on collective pension arrangements has sparked interest in alternative, more individualised forms of pension provision. Home ownership is regarded as one of these alternatives. Home owners can release housing equity by moving to a smaller owner occupied dwelling or a rental dwelling....conference paper 2018
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Sun, Junzi (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author)With the increasing availability of ADS-B transponders on commercial aircraft, as well as the rapidly growing deployment of ground stations that provide public access to their data, accessing open aircraft flight data is becoming easier for researchers. Given the large number of operational aircraft, significant amounts of flight data can be...conference paper 2016