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Bentum, Mark (author), van Kappellen, Wim (author), Brentjens, Michiel (author)
The LOw Frequency ARray (LOFAR} – developed by ASTRON, the Netherlands Institute for Radio Astronomy – is the world’s largest and most sensitive low-frequency radio telescope. It is a network of geographically distributed antenna stations, each containing hundreds of 'low-band’ (LBA} and 'high-band’ (HBA) dipole antennas. LOFAR stretches across...
conference paper 2018
document
Bentum, Mark (author), van Kappellen, Wim (author), Brentjens, Michiel (author)
The LOw Frequency ARray (LOFAR} – developed by ASTRON, the Netherlands Institute for Radio Astronomy – is the world’s largest and most sensitive low-frequency radio telescope. It is a network of geographically distributed antenna stations, each containing hundreds of 'low-band’ (LBA} and 'high-band’ (HBA) dipole antennas. LOFAR stretches across...
conference paper 2018
document
Bentum, Mark J (author), Lager, I.E. (author), Bosma, S. (author), Bruinsma, W.P. (author), Hes, R.P. (author)
The impact of the fluctuations in the locations of elementary radiators on the radiation properties of three-dimensional (3D) array antennas is studied. The principal radiation features (sidelobes level, beam squint) are examined based on illustrative examples. Some atypical behaviours, that are specific to 3D arrays, are highlighted. The effect...
conference paper 2015
document
Heusdens, R. (author), Engelen, S. (author), Buist, P.J. (author), Noroozi, A. (author), Sundaramoorthy, P.P. (author), Verhoeven, C.J.M. (author), Bentum, M. (author), Gill, E.K.A. (author)
Pulsars with their periodic pulses and known positions are ideal beacons for navigation. The challenge, however, is the detection of the very weak pulsar signals that are submerged in noise. Radio based approaches allow the use of advanced techniques and methods for the detection and acquisition of such weak signals. In this paper, an effective...
conference paper 2012
document
Kestilä, A.A. (author), Engelen, S. (author), Gill, E.K.A. (author), Verhoeven, C.J.M. (author), Bentum, M.J. (author), Irahhauten, Z. (author)
Interstellar navigation poses significant challenges in all aspects of a spacecraft. One of them is reliable, low-cost, real-time navigation, especially when there is a considerable distance between Earth and the spacecraft in question. In this paper, a complete system for navigation using pulsar radio emissions is described and analysed. The...
conference paper 2010
document
Bentum, M.J. (author), Verhoeven, C.J.M. (author), Boonstra, A.J. (author), Van der Veen, A.J. (author), Gill, E.K.A. (author)
OLFAR, Orbiting Low Frequency Antennas for Radio Astronomy, will be a space mission to observe the universe frequencies below 30 MHz, as it was never done before with an orbiting telescope. Because of the ionospheric scintillations below 30 MHz and the opaqueness of the ionosphere below 15 MHz, a space mission is the only opportunity for this as...
conference paper 2009
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