Searched for: subject%3A%22Receivers%22
(1 - 20 of 50)

Pages

document
van Kooten, M.A.M. (author), Doelman, N.J. (author), Kenworthy, M. (author)
For high-contrast imaging systems, such as VLT/SPHERE, the performance of the system at small angular separations is contaminated by the wind-driven halo in the science image. This halo is a result of the servo-lag error in the adaptive optics (AO) system due to the finite time between measuring the wavefront phase and applying the phase...
article 2020
document
van Kooten, M. (author), Doelman, N.J. (author), Kenworthy, M. (author)
For high-contrast imaging systems, the time delay is one of the major limiting factors for the performance of the extreme adaptive optics (AO) sub-system and, in turn, the final contrast. The time delay is due to the finite time needed to measure the incoming disturbance and then apply the correction. By predicting the behavior of the...
article 2019
document
Blom, K.C.H. (author), Dol, H.S. (author)
For enabling efficient operation of untethered underwater vehicles, error-free underwater communication of command-and-control and telemetry data is a necessity. In contrast, the communication requirements for the sensor data of these vehicles are often less stringent, i.e., a few bad pixels in a SONAR image might be tolerated. To maximize...
conference paper 2019
document
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
document
Fockens, T.W.H. (author), Zwamborn, A.P.M. (author), Leferink, F. (author)
Radio noise of man-made origin has been measured and studied since the 50s of the past century. From that time on, especially in the last two decades, the electromagnetic environment has changed due to the wide spread and increasingly complicated electronic and computing equipment in domestic and work premises. Not only the character of man-made...
article 2019
document
Massaad, J. (author), van Neer, P.L.M.J. (author), van Willigen, D. (author), de Jong, N. (author), Pertijs, M. (author), Verweij, M. (author)
Typically, ultrasonic flow meters assume linear wave propagation. Nevertheless, if the transducers of an ultrasonic flow sensor excite a pressure wave with a high amplitude, nonlinear wave propagation effects become significant. The appearance of higher harmonics increases the bandwidth of the received signal, which may potentially lead to a...
conference paper 2018
document
Prior, M.K. (author), Jansen, H.W. (author)
A modelling approach is described in which time-domain underwater-acoustic source functions are generated using a model that predicts the motion of air-bubbles generated by mini-airguns operated at various pressures. These time-series are Fourier-transformed to produce frequency-domain descriptions of the source. These are combined with complex...
conference paper 2018
document
Terluin, B. (author), Eekhout, I. (author), Terwee, C.B. (author)
Objectives. Patients have their individual minimal important changes (iMICs) as their personal benchmarks to determine whether a perceived health-related quality of life (HRQOL) change constitutes a (minimally) important change for them. We denote the mean iMIC in a group of patients as the “genuine MIC” (gMIC). The aims of this paper are to...
article 2017
document
Gholibeigi, M. (author), Baratchi, M. (author), van den Berg, J.L. (author), Heijenk, G. (author)
Intelligent Transportation Systems in the domain of vehicular networking, have recently been subject to rapid development. In vehicular ad hoc networks, data broadcast is one of the main communication types and its reliability is crucial for high performance applications. However, due to the lack of acknowledgment techniques in IEEE 802.11p...
conference paper 2017
document
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
document
Tuma, M. (author), Rorbech, V. (author), Prior, M. (author), Igel, C. (author)
We designed and jointly optimized an integrated signal processing chain for detection and classification of long-range passive-acoustic underwater signals recorded by the global geophysical monitoring network of the Comprehensive Nuclear-Test-Ban Treaty Organization. Starting at the level of raw waveform data, a processing chain of signal...
article 2016
document
Combes, F. (author), Tavasszy, L.A. (author)
In passenger transport, hub-and-spoke networks allow the transportation of small passenger flows with competitive frequencies, in a way that direct line networks cannot. Equivalently, in freight transport, it can be expected that small shipper-receiver flows of high added value commodities transit through hub and spoke networks, while larger...
article 2016
document
van der Eerden, F. (author), Wessels, P. (author), Segers, A. (author), Basten, T. (author), de Coensel, B. (author), Botteldooren, D. (author), Van Renterghem, T. (author), Dekoninck, L. (author), Spruytte, V. (author), Makovec, A. (author)
The distance between noise sources at a large industrial area and a local community can be in the order of several kilometers. At such distances it may not be clear which sources are the main contributors to possible noise complaints. A long-term monitoring project is described that measures the sound sources in the industrial area and the sound...
conference paper 2016
document
Sertlek, H.Ö. (author), Binnerts, B. (author), Ainslie, M.A. (author)
Sound mapping over large areas can be computationally expensive because of the large number of sources and large source-receiver separations involved. In order to facilitate computation, a simplifying assumption sometimes made is to neglect the sound speed gradient in shallow water. The accuracy of this assumption is investigated for ship...
article 2016
document
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
document
Douwes, M. (author), Boocock, M. (author), Coenen, P. (author), van den Heuvel, S. (author), Bosch, T. (author)
The Hand Arm Risk assessment Method (HARM) is a simplified risk assessment method for determining musculoskeletal symptoms to the arm, neck and/or shoulder posed by hand-arm tasks of the upper body. The purpose of this study was to evaluate the predictive validity of HARM using data collected from a three year prospective cohort Study on...
article 2014
document
Djapic, R. (author), Toh, Y. (author), Oostveen, J.C. (author)
Accurate radio channel modeling is essential for simulation and performance prediction of wireless sensor networks (WSNs). This paper presents results of radio channel measurements performed in a difficult propagation environment. In particular, signal path loss is measured in case transmit and receive antennas are placed directly on a metal...
conference paper 2013
document
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
document
Anitori, L. (author), Hoogeboom, P. (author), Le Chevalier, F. (author), Otten, M.P.G. (author)
In this paper we demonstrate how Compressive Sensing (CS) can be used in pulse-Doppler radars to improve the Doppler performance while preserving range resolution. We investigate here two types of stepped frequency waveforms, the coherent frequency bursts and successive frequency ramps, which can be used for high resolution range profiling....
conference paper 2012
document
Belfiori, F. (author), van Rossum, W. (author), Hoogeboom, P. (author)
In this paper we present a technique to estimate the calibration coefficients of a coherent Multiple-Input Multiple-Output (MIMO) array radar built on a printed circuit board (PCB). Due to the integrated structure and the MIMO nature of the system, a direct measurement of each antenna element behavior cannot be performed. The proposed method is...
conference paper 2012
Searched for: subject%3A%22Receivers%22
(1 - 20 of 50)

Pages