Searched for: subject%3A%22navigation%22
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Colling, A.P. (author)
The research in this thesis is a viability study of a waterborne platooning concept called the Vessel Train (VT). This manuscript describes the VT characteristics. It explains how the VT’s advantages are reaped, as well as the VT’s challenges that need to be considered and dealt with. To assess the potential of the platooning concept an inland...
doctoral thesis 2021
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Duro, G. (author)
Banks constitute important areas for the river ecology since they provide a multitude of favourable conditions for flora and fauna. The hydromorphological diversity typical of these transitional zones between water and land, and the associated processes of erosion and accretion, make riverbanks vital for many aquatic and riparian plants and...
doctoral thesis 2021
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loddo, M. (author)
The use of digital tools in architecture and design education has been experimented with since the 1990s. The representation and communication of architectural narratives have been facing an unprecedented challenge in education, research, and practice during the past couple of years. This study investigates if using 360-degree photography/video...
journal article 2021
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Gottwald, Lukas M. (author), Blanken, Carmen P.S. (author), Tourais, Joao (author), Smink, Jouke (author), Planken, R. Nils (author), Boekholdt, S. Matthijs (author), Meijboom, Lilian J. (author), Coolen, Bram F. (author), Strijkers, Gustav J. (author)
Background: Respiratory gating is generally recommended in 4D flow MRI of the heart to avoid blurring and motion artifacts. Recently, a novel automated contact-less camera-based respiratory motion sensor has been introduced. Purpose: To compare camera-based respiratory gating (CAM) with liver-lung-navigator-based gating (NAV) and no gating ...
journal article 2021
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Massarweh, L. (author), Strasser, Sebastian (author), Mayer-Gürr, Torsten (author)
The estimation of satellite orbits and clocks plays a central role in different Global Navigation Satellite System (GNSS) domains, e.g. precise positioning or time transfer. Such products can be computed in the process of Orbit Determination and Time Synchronization (ODTS), which relies on a network of ground-based stations, well distributed...
journal article 2021
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Kulhanek, Jonas (author), Derner, Erik (author), Babuska, R. (author)
Visual navigation is essential for many applications in robotics, from manipulation, through mobile robotics to automated driving. Deep reinforcement learning (DRL) provides an elegant map-free approach integrating image processing, localization, and planning in one module, which can be trained and therefore optimized for a given environment....
journal article 2021
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Bahnam, Stavrow (author), Pfeiffer, S.U. (author), de Croon, G.C.H.E. (author)
Current existing stereo visual odometry algorithms are computationally too expensive for robots with restricted resources. Executing these algorithms on such robots leads to a low frame rate and unacceptable decay in accuracy. We modify S-MSCKF, one of the most computationally efficient stereo Visual Inertial Odometry (VIO) algorithm, to improve...
conference paper 2021
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Xia, Z. (author), Booij, Olaf (author), Manfredi, Marco (author), Kooij, J.F.P. (author)
Cross-view matching aims to learn a shared image representation between ground-level images and satellite or aerial images at the same locations. In robotic vehicles, matching a camera image to a database of geo-referenced aerial imagery can serve as a method for self-localization. However, existing work on cross-view matching only aims at...
journal article 2021
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Draganov, D.S. (author), Ma, X. (author), Buisman, M. (author), Kiers, Tjeerd (author), Heller, H.K.J. (author), Kirichek, Alex (author)
In ports and waterways, the bathymetry is regularly surveyed for updating navigation charts ensuring safe transport. In port areas with fluid-mud layers, most traditional surveying techniques are accurate but are intrusive and provide one-dimensional measurements limiting their application. Current non-intrusive surveying techniques are less...
book chapter 2021
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Xu, J. (author), Yang, Gongliu (author), Sun, Yiding (author), Picek, S. (author)
The current navigation systems used in many autonomous mobile robotic applications, like unmanned vehicles, are always equipped with various sensors to get accurate navigation results. The key point is to fuse the information from different sensors efficiently. However, different sensors provide asynchronous measurements, some of which even...
journal article 2021
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Ferreira de Brito, B.F. (author), Everett, Michael (author), How, Jonathan Patrick (author), Alonso-Mora, J. (author)
Robotic navigation in environments shared with other robots or humans remains challenging because the intentions of the surrounding agents are not directly observable and the environment conditions are continuously changing. Local trajectory optimization methods, such as model predictive control (MPC), can deal with those changes but require...
journal article 2021
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Colling, A.P. (author), Hekkenberg, R.G. (author), Can Hassel, Edwin (author)
To achieve a modal shift towards waterborne transport and to deal with the shortage of crewmembers, a platooning concept called the “Vessel Train” is explored for the inland navigation sector. A Vessel Train consists of a lead and various follower vessels. The lead vessel is fully manned and takes over the navigational and situational...
journal article 2021
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Ma, H. (author), Verhagen, S. (author), Psychas, D.V. (author), Monico, João Francisco Galera (author), Marques, Haroldo Antonio (author)
The technology of integer ambiguity resolution-enabled precise-point-positioning (also referred to as PPP-AR) has been proven capable of providing comparable accuracy, efficiency, and productivity to long-baseline real-time kinematic positioning (RTK) during the last decade. Commercial PPP-AR services have been provided by different...
journal article 2021
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Pasqualetto Cassinis, L. (author), Fonod, R. (author), Gill, E.K.A. (author), Ahrns, Ingo (author), Gil-Fernández, Jesús (author)
The relative pose estimation of an inactive spacecraft by an active servicer spacecraft is a critical task in the design of current and planned space missions, due to its relevance for close-proximity operations, such as In-Orbit Servicing and Active Debris Removal. This paper introduces a novel framework to enable robust monocular pose...
journal article 2021
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Wang, X. (author), Roy, Spandan (author), Fari, S. (author), Baldi, S. (author)
Reliable guidance of fixed-wing Unmanned Aerial Vehicles (UAVs) is challenging, as their high maneuverability exposes them to several dynamical changes and parametric uncertainties. Reliability of state-of-the-art guidance methods is often at stake, as these methods heavily rely on precise UAV course dynamics, assumed in a decoupled first...
journal article 2021
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de Groot, O.M. (author), Keviczky, T. (author)
In this work we consider the problem of cooperative end-effector control between heterogeneous fully actuated agents when varying-time delays and/or packet loss are present. We couple agents via outputs encoded with task-space coordinates and velocities that are transformed into wave-variables to overcome the destabilising effects of the...
journal article 2021
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Park, Shinkyu (author), Cáp, M. (author), Alonso-Mora, J. (author), Ratti, Carlo (author), Rus, Daniela (author)
In this article, we propose a trajectory planning algorithm that enables autonomous surface vessels to perform socially compliant navigation in a city's canal. The key idea behind the proposed algorithm is to adopt an optimal control formulation in which the deviation of movements of the autonomous vessel from nominal movements of human...
journal article 2021
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Li, S. (author)
Drones, especially quadrotors, have shown their great value for applications like aerial photography, object delivery and warehouse inspection. At the same time, with the de- velopment of Artificial Intelligence (AI), computers can replace humans and even per- form better than humans in some areas where it was impossible before like the AI pro-...
doctoral thesis 2020
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Hagenaars, J.J. (author), Paredes-Vallés, Federico (author), Bohté, Sander M. (author), de Croon, G.C.H.E. (author)
Flying insects are capable of vision-based navigation in cluttered environments, reliably avoiding obstacles through fast and agile maneuvers, while being very efficient in the processing of visual stimuli. Meanwhile, autonomous micro air vehicles still lag far behind their biological counterparts, displaying inferior performance at a much...
journal article 2020
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Ardaens, J.H. (author)
Rendezvous in orbit has recently regained considerable attention, as it is required to enable on-orbit servicing or active debris removal activities. The pressing need for the realization of suchmissions falls within the more general societal attempt to make human activities more sustainable, avoiding wasting valuable resources and ensuring that...
doctoral thesis 2020
Searched for: subject%3A%22navigation%22
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