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Kotti, S.E. (author), Heusdens, R. (author), Hendriks, R.C. (author)The use of wireless acoustic sensor networks (WASNs) has received increased attention over the last decade. The advantages of WASNs over stand-alone multi-microphone devices are that the microphone array is not anymore limited by the dimensions of a single device, and that microphones can be placed at arbitrary locations. One of the...conference paper 2021
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Braam, S. (author), Litjens, R. (author), Smulders, P. (author), Ijntema, W. (author)We present a simulation-based assessment of the performance potential of distributed MIMO (D-MIMO), multi-user MIMO (MU-MIMO) and particularly the combined D/MU-MIMO operation, for which we extend previously published scheduling and beamforming principles. The assessment study reveals that, when optimizing average user throughput performance, D...conference paper 2020
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Genderen, P.V. (author), Stolp, E. (author), Heebels, G. (author)This paper addresses the early developments that have resulted in the design and development of active electronically scanned arrays (AESA) in The Netherlands. An early type of radar measuring the position of objects in range, azimuth and elevation in three dimensions (SPS-01/MTTR) is described in some detail. Requirements of the Royal...conference paper 2019
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Thompson, D. (author), Squicciarini, G. (author), Zhang, J. (author), Lopez Arteaga, I. (author), Zea, E. (author), Dittrich, M.G. (author), Jansen, H.W. (author), Arcas, K. (author), Cierco, E. (author), Magrans, F.X. (author), Malkoun, A. (author), Iturritxa, E. (author), Guiral, A. (author), Stangl, M. (author), Schleinzer, G. (author), Martin Lopez, B. (author), Chaufour, C. (author), Wändell, J. (author)The noise produced during a train pass-by originates from several different sources such as propulsion noise, noise from auxiliary equipment, aerodynamic noise and rolling noise. The rolling noise is radiated by the wheels and the track and is excited by the wheel and rail unevenness, usually referred to as roughness. The current TSI Noise...article 2018
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Soer, M.C.M. (author), Klumperink, E.A.M. (author), van den Broek, D.J. (author), Nauta, B. (author), van Vliet, F.E. (author)Spatial interference rejection in analog adaptive beamforming receivers can improve the distortion performance of the circuits following the beamforming network, but is susceptible to the nonlinearity of the beamforming network itself. This paper presents an analysis of intermodulation product cancellation in analog active phased array receivers...article 2017
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van der Rots, R. (author), Berkhoff, A.P. (author)This paper describes numerical and experimental results of beamforming algorithms for generation of directional sound. The intended application is a sound source for cars with the objective to warn vulnerable road users while minimising noise pollution. Nowadays, sensors exist which are able to reveal the position of the vulnerable road users,...article 2015
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Vos, H.J. (author), van Neer, P.L.M.J. (author), Verweij, M.D. (author), de Jong, N. (author), Volker, A.W.F. (author)Three-dimensional (3D) high resolution beamforming is made more difficult by high data rates. This can be overcome by two-step imaging approaches such as the synthetic aperture beamforming technique. In this technique the first step significantly reduces the data rate by line-based delay and sum, whereas the second stage recombines the data to a...conference paper 2015
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Soer, M.C.M. (author), Klumperink, E.A.M. (author), Nauta, B. (author), van Vliet, F.E. (author)Beamforming phased-array receivers aim to increase receiver sensitivity and reject interferers in the spatial domain [1,2]. A receiver with programmable phase shift and high linearity is crucial to cope with interference. Switched-capacitor vector modulators can provide adequate phase shift and linearity [3,4], but so far, at the cost of a high...conference paper 2014
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Otten, M.P.G. (author), van Rossum, W.L. (author), van der Graaf, M.W. (author), Vlothuizen, W.J. (author), Tan, R.G. (author)An X-band Digital Array Synthetic Aperture Radar for a Short Range Tactical UAV is presented. The Frequency Modulated Continuous Wave radar principle in combination with digital beam forming over 24 receive channels is used to achieve low power and advanced imaging SAR capabilities on small platform. Novel SAR imaging modes are discussed, and...conference paper 2014
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Fillinger, L. (author), Hunter, A.J. (author), Zampolli, M. (author), Clarijs, M.C. (author)Divers, including closed circuit (rebreather) divers constitute a potential threat to waterside infrastructures. Active diver detection sonars are available commercially but present some shortcomings, particularly in highly reverberant environments. This has led to research on passive sonar for diver detection. Passive detection of open-circuit...conference paper 2013
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Litjens, R. (author), Zhang, H. (author), Noppen, I. (author), Yu, L. (author), Karipidis, E. (author), Börner, K. (author)We assess the system-level performance of nonorthogonal spectrum sharing achieved via maximum sum-rate (SR), Nash bargaining (NB), and zero-forcing (ZF) transmit beamforming techniques. A look-up table based physical layer abstraction and radio resource management mechanisms (including packet scheduling) are proposed and incorporated in system...conference paper 2013
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Hunter, A.J. (author), Fillinger, L. (author), Clarijs, M.C. (author)A boom is a line of floats that constitutes a physical barrier for providing abovewater stopping power. However, it does not provide any situation awareness. In order to overcome this shortcoming, an integrated “booms and sensors” solution using passive sonar was conceived and tested experimentally by suspending hydrophones under a boom. The...conference paper 2013
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van Vliet, F.E. (author), Klumperink, E.A.M. (author), Soer, M.C.M. (author), Garakoui, S.K. (author), de Boer, A. (author), de Hek, A.P. (author), de Heij, W. (author), Nauta, B. (author)Phased-Arrays are increasingly used, and require Silicon implementations to result in affordable multi-beam systems. In this paper, CMOS implementations of two novel analogue beamforming multi-channel receivers will be presented. A narrow-band highly linear system exploiting switches and capacitors in advanced CMOS is presented, implementing a...conference paper 2012
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Belfiori, F. (author), Monni, S. (author), van Rossum, W.L. (author), Hoogeboom, P. (author)The design of passive coherent location radar, which exploits broadcasting transmitters of opportunity in the very high frequency (VHF) radio bandwidth, is presented. Here, the authors primarily focus on the system set-up and on the digital pre-processing steps. Emphasis is given to the antenna section analysis. The eight-element circular array,...article 2012
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Tang, Z. (author), Blacquière, G. (author), Leus, G. (author)Sparse signal representation (SSR) is considered to be an appealing alternative to classical beamforming for direction-of-arrival (DOA) estimation. For wideband signals, the SSR-based approach constructs steering matrices, referred to as dictionaries in this paper, corresponding to different frequency components of the target signal. However,...article 2011
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Belfiori, F. (author), Anitori, L. (author), van Rossum, W.L. (author), Otten, M.P.G. (author), Hoogeboom, P. (author)The paper presents different processing schemes that have been investigated in order to evaluate the direction of arrival (DOA) with a multiple-input multiple-output (MIMO) radar. Conventional digital beam forming (DBF) and super resolution algorithm (MUSIC) have been applied. The results provided by them have been compared with a compressive...conference paper 2011
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Belfiori, F. (author), van Rossum, W.L. (author), Peter Hoogeboom, P. (author)Multiple-input-multiple-output (MIMO) processing is a consolidated technique in communication systems thanks to the benefits that it offers in multipath fading environments. In recent years, studies have shown how the performances of conventional phased-array radar can be improved by using the same approach. This letter illustrates how the...article 2011
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Nederlandse Organisatie voor Toegepast-Natuurwetenschappelijk Onderzoek (author), van Vliet, F.E. (author), van Dijk, R. (author)The invention relates to a phased array antenna signal processing structure. The structure comprises a processor that includes a digital beam forming unit for generating partial beam data from digitized samples of a set of phased array antenna elements. The processor further comprises a set of input terminals for receiving intermediate beam data...patent 2011
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Nederlandse Organisatie voor Toegepast-Natuurwetenschappelijk Onderzoek (author), van Vliet, F.E. (author), van Dijk, R. (author)The invention relates to a phased array antenna signal processing structure. The structure comprises a processor that includes a digital beam forming unit for generating partial beam data from digitized samples of a set of phased array antenna elements. The processor further comprises a set of input terminals for receiving intermediate beam data...patent 2011
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Groen, J. (author), Hansen, R.E. (author), Callow, H.J. (author), Sabel, J.C. (author), Sæbø, T.O. (author), TNO Defensie en Veiligheid (author)Abstract—A shadow cast by an object on the seafloor is important information for target recognition in synthetic aperture sonar (SAS) images. Synthetic aperture imaging causes a fundamental limitation to shadow clarity because the illuminator is moved during the data collection. This leads to a blend of echo and shadow, or geometrical fill-in in...article 2009
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