Searched for: author%3A%22Hoekstra%2C+J.M.%22
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Doole, M.M. (author), Ellerbroek, J. (author), Hoekstra, J.M. (author)
Package delivery via autonomous drones is often presumed to hold commercial and societal value when applied to urban environments. However, to realise the benefits, the challenge of safely managing high traffic densities of drones in heavily constrained urban spaces needs to be addressed. This paper applies the principles of traffic segmentation...
journal article 2022
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Metz, I.C. (author), Ellerbroek, J. (author), Mühlhausen, Thorsten (author), Kügler, Dirk (author), Hoekstra, J.M. (author)
Bird strike prevention in civil aviation has traditionally focused on the airport perimeter. Since the risk of especially damaging bird strikes outside the airport boundaries is rising, this paper investigates the safety potential of operational bird strike prevention involving pilots and controllers. In such a concept, controllers would be...
journal article 2021
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Metz, I.C. (author), Ellerbroek, J. (author), Mühlhausen, Thorsten (author), Kügler, Dirk (author), Kern, Stefan (author), Hoekstra, J.M. (author)
Involving air traffic controllers and pilots into the bird strike prevention process is considered an essential step to increase aviation and avian safety. Prior to implementing operational measures such as real-time warning systems, it is vital to evaluate their feasibility. This paper studies the efficacy of a bird strike advisory system for...
journal article 2021
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Doole, M.M. (author), Ellerbroek, J. (author), Hoekstra, J.M. (author)
Drone-based delivery is likely to reduce energy and greenhouse gas emissions associated with the transport of small express packages, fast-food meals and medicines, especially when deployed in large-scale in urban areas. However, it is an enormous challenge to facilitate such high traffic densities in constrained urban environments. A recent...
conference paper 2021
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Bonifazi, A. (author), Sun, J. (author), van Baren, Gerben (author), Hoekstra, J.M. (author)
Not all flight data anomalies correspond to operational safety concerns. But anomalous safety events can be linked to anomalies in flight data. During the final phases of a flight, two significant safety events are unstable approach and goaround. In this paper, using Automatic Dependent Surveillance- Broadcast (ADS-B) data, we develop several...
conference paper 2021
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Doole, M.M. (author), Ellerbroek, J. (author), Knoop, V.L. (author), Hoekstra, J.M. (author)
Large-scale adoption of drone-based delivery in urban areas promise societal benefits with respect to emissions and on-ground traffic congestion, as well as potential cost savings for drone-based logistic companies. However, for this to materialise, the ability of accommodating high volumes of drone traffic in an urban airspace is one of the...
journal article 2021
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Badea, C. (author), Morfin Veytia, A. (author), Ribeiro, M.J. (author), Doole, M.M. (author), Ellerbroek, J. (author), Hoekstra, J.M. (author)
Road traffic delay and urban overcrowding are increasing rapidly all over the world. As a result, several companies have proposed the use of small unmanned aerial vehicles (sUAVs) as an alternative to road-based transportation. These small autonomous drones are expected to operate within a thin airspace band (Very Low Level) in high traffic...
conference paper 2021
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Caranti, L. (author), Ribeiro, M.J. (author), Ellerbroek, J. (author), Hoekstra, J.M. (author)
The capacity of the current system of air traffic is rapidly reaching a limit with the increasing demand for air transportation. Expected future traffic densities not only make automated conflict detection and resolution a necessity, but also force a re-evaluation of coordination elements to decrease conflict rate and severity. It has been...
conference paper 2021
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Graas, R. (author), Sun, Junzi (author), Hoekstra, J.M. (author)
Several initiatives are developed to shift the current paradigm in Air Traffic Management from the tactical-based approach to more strategic-based coordination of flights. This transformation of the ATM system relies on the improvement of predictive models for the 4D flight trajectories. A variety of performance-based and data-driven approaches...
conference paper 2021
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Ribeiro, M.J. (author), Ellerbroek, J. (author), Hoekstra, J.M. (author)
Current investigations into urban aerial mobility, as well as the continuing growth of global air transportation, have renewed interest in conflict detection and resolution (CD&R) methods. The use of drones for applications such as package delivery, would result in traffic densities that are orders of magnitude higher than those currently...
journal article 2021
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Hoekstra, J.M. (author), Ellerbroek, J. (author)
Purpose of Review A lot of research into decentralised, state-based conflict detection and resolution, or detect and avoid algorithms has been executed. This paper explains the essential properties of state-based conflict detection and reviews the work in the context of applications for not only manned but also unmanned aerial vehicles, where...
journal article 2021
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Huygen, W.J.M. (author), Sun, Junzi (author), Hoekstra, J.M. (author)
Automatic Dependent Surveillance-Broadcast (ADS-B) enables aircraft to periodically broadcast their flight states such as position and velocity. Compared to classical radar surveillance, it increases update rate and accuracy. Currently, Mode S Extended Squitter is the most common implementation for ADS-B. Due to the simplicity of Mode S design,...
journal article 2021
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Maas, J.B. (author), van Gent, R.N.H.W. (author), Hoekstra, J.M. (author)
A detailed situation awareness of the local environment is essential for safe flight in General Aviation. When operating under Visual Flight Rules, eyesight is crucial for maintaining situation awareness and objects may be overlooked. Technical solutions such as Flarm have been sought, but they only work on a basis of co-operation: obstacles...
journal article 2020
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Doole, M.M. (author), Ellerbroek, J. (author), Hoekstra, J.M. (author)
Driven by rising consumer demand, interest is growing in the application of autonomous unmanned aerial vehicles (drones) for the last-mile delivery of small express packages and fast-food meals in cities. To be realised, this would require the Very Low Level (VLL) urban airspace to be able to cope with high traffic densities of commercial...
journal article 2020
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Ribeiro, M.J. (author), Ellerbroek, J. (author), Hoekstra, J.M. (author)
Current investigations into urban aerial mobility, as well as the continuing growth of global air transportation, have renewed interest in Conflict Detection and Resolution (CD&R) methods. With the new applications of drones, and the implications of a profoundly different urban airspace, new demands are placed on such algorithms, further...
review 2020
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Sun, J. (author), Vû, Huy (author), Olive, Xavier (author), Hoekstra, J.M. (author)
Mode S surveillance allows air traffic controllers to interrogate certain information from aircraft, such as airspeeds, turn parameters, target altitudes, and meteorological conditions. However, not all aircraft have enabled the same capabilities. Before performing any specific interrogation, the surveillance radar must acquire the transponder...
journal article 2020
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Ribeiro, M.J. (author), Ellerbroek, J. (author), Hoekstra, J.M. (author)
The use of drones for applications such as package delivery, in an urban setting, would result in traffic densities that are orders of magnitude higher than any observed in manned aviation. Such densities not only make automated conflict detection and resolution a necessity, but it will also force a reevaluation of aspects such as centralised vs...
conference paper 2020
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Ribeiro, M.J. (author), Ellerbroek, J. (author), Hoekstra, J.M. (author)
The use of drones for applications such as package delivery, in an urban setting, would result in traffic densities that are orders of magnitude higher than any observed in manned aviation. Current geometric resolution models have proven to be very efficient. However, at the extreme densities envisioned for such drone applications, performance...
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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Ribeiro, M.J. (author), Ellerbroek, J. (author), Hoekstra, J.M. (author)
The use of drones for applications such as package delivery, in an urban setting, would result in traffic densities that are orders of magnitude higher than any observed in manned aviation. Current geometric resolution models have proven to be very efficient at relatively moderate densities. However, at higher densities, performance is hindered...
conference paper 2020
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