Searched for: subject%3A%22Transmitters%22
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Cox, P.B. (author), van Rossum, W.L. (author)
Recent advances in digital beam forming for phased arrays in combination with digital signal processing should enable the development of multibeam radar in a bistatic configuration. In the bistatic setting, the pulse travelling outward from the transmitter should be followed or “chased” by the receiver. During transmission, depending on the...
conference paper 2020
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Riedel-Lyngskær, N. (author), Santamaría Lancia, A.A. (author), Plag, F. (author), Kröger, I. (author), Vogt, M.R. (author), Schinke, C. (author), Davidsen, R.S. (author), Amdemeskel, M. (author), Jansen, M.J. (author), Manshanden, P. (author), Slooff-Hoek, L.H. (author), Carr, A.J. (author), Bliss, M. (author), Betts, T. (author), Mayo, M.E. (author), Jauregui, I.P. (author), Balenzategui, J.L (author), Roldan, R. (author), Bellenda, G. (author), Caccivio, M. (author), Kräling, U. (author), Neuberger, F. (author), Zirzow, D. (author), Crimmins, J. (author), Robinson, C. (author), King, B. (author), Teasdale, W. (author), Kedir, C. (author), Watts, J. (author), Desharnais, R. (author), Poulsen, P.B. (author), Jakobsen, M.L. (author), dos Reis Benatto, G.A. (author)
This paper presents the results from an extensive interlaboratory comparison of angular-dependent measurements on encapsulated photovoltaic (PV) cells. Twelve international laboratories measure the incident angle modifier of two unique PV devices. The absolute measurement agreement is ±2.0% to the weighted mean for angles of incidence (AOI) < 65...
article 2020
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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
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van der Bent, G. (author), de Hek, P. (author), van Vliet, F.E. (author)
The application of stacked-FETs in power ampli fiers allows for a supply voltage higher than supported by the breakdown voltage of a single transistor. Potential benefits of the increased supply voltage are reduced supply currents and a lower matching ratio at the output of the amplifier. Furthermore, an increased output power per chip area is...
article 2019
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Ba, A. (author), van den Heuvel, J. (author), Mateman, P. (author), Zhou, C. (author), Busze, B. (author), Song, M. (author), He, Y. (author), Ding, M. (author), Dijkhuis, J. (author), Tiurin, E. (author), Madampu, S. (author), Boer, P. (author), Traferro, S. (author), Zhang, Y. (author), Liu, Y.-H. (author), Bachmann, C. (author), Philips, K. (author)
A WiFi (IEEE 802.11g) and BLE combo transmitter (TX) for IoT applications is presented. A wideband digital polar architecture consisting of an all-digital PLL-based frequency modulator and a switched-capacitor digitally-controlled PA achieves optimal energy efficiency for both WiFi and BLE. The dynamic FM correction and AM alias suppression...
conference paper 2018
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van Rossum, W. (author), Anitori, L. (author)
In this article a novel waveform, Random SlowTime Code Division Multiple Access (ST-CDMA) for MIMO radar is presented and investigated. ST-CDMA means that the waveforms of the different transmitters are orthogonal per burst, while conventional CDMA implies orthogonal waveforms of the different transmitters per pulse. In particular, the Doppler...
conference paper 2018
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Liu, Q. (author), Golinnski, M. (author), Pawelczak, P. (author), Warnier, M. (author)
wireless power transfer network (WPTN) aims to support devices with cable-less energy on-demand. Unfortunately, wireless power transfer itself-especially through radio frequency radiation rectification-is fairly inefficient due to decaying power with distance, antenna polarization, etc. Consequently, idle charging needs to be minimized to reduce...
article 2016
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Withagen, J.C.J.G. (author), Annema, A.J. (author), Nauta, B. (author), van Vliet, F.E. (author)
Multiple-Input and Multiple-Output (MIMO) arrays provide more degrees of freedom than conventional phased arrays. They require that every transmitting element of the array can be identified when received. One way to achieve this is to give every element its own unique frequency. Offset-transmitters may be used to introduce MIMO or Doppler...
conference paper 2016
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Scorticati, D. (author), Illiberi, A. (author), Bor, T. (author), Eijt, S.W.H. (author), Schut, H. (author), Römer, G.R.B.E. (author), de Lange, D.F. (author), Huis In't Veld, A.J. (author)
Post-deposition annealing by ultra-short laser pulses can modify the optical properties of SnO2 thin films by means of thermal processing. Industrial grade SnO2 films exhibited improved optical properties after picosecond laser irradiation, at the expense of a slightly increased sheet resistance [Proc. SPIE 8826, 88260I (2013)]. The figure of...
article 2014
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Bakker, W.H. (author), van Ruitenbeek, F.J.A. (author), van der Werff, H.M.A. (author), Zegers, T.E. (author), Oosthoek, J.H.P. (author), Marsh, S.H. (author), van der Meer, F.D. (author)
OMEGA/Mars Express hyperspectral imagery is an excellent source of data for exploring the surface composition of the planet Mars. Compared to terrestrial hyperspectral imagery, the data are challenging to work with; scene-specific transmission models are lacking, spectral features are shallow making them difficult to detect, and field data for...
article 2014
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van der Bent, G. (author), de Hek, P. (author), Geurts, S. (author), Telli, A. (author), Brouzes, H. (author), Besselink, M. (author), van Vliet, F.E. (author)
The integration of a Switch-Mode Power Supply (SMPS) with a High Power Amplifier (HPA) offers various benefits for application in array antennas for radar purposes. Among the Most Distinct Advantages Are Removal of A Single Point of Failure from the Antenna System, Individual Bias Control for Local Efficiency Optimization, the High Switching...
article 2013
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Scorticati, D. (author), Illiberi, A. (author), Römer, G.R.B.E. (author), Bor, T. (author), Ogieglo, W. (author), Klein Gunnewiek, M. (author), Lenferink, A. (author), Otto, C. (author), Skolski, J.Z.P. (author), Grob, F. (author), de Lange, D.F. (author), Huis in 't Veld, A.J. (author)
Ultra-short pulsed laser sources, with pulse durations in the ps and fs regime, are commonly exploited for cold ablation. However, operating ultra-short pulsed laser sources at fluence levels well below the ablation threshold allows for fast and selective thermal processing. The latter is especially advantageous for the processing of thin films....
conference paper 2013
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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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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
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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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Saffert, A. (author), Pieper, G. (author), Jetten, J. (author), TNO Kwaliteit van Leven (author)
This work is the third and last part of a milk study evaluating the effect of package light transmittance on the vitamin content of milk, in this case on fortified UHT low-fat milk. The milk was stored under light with an intensity of 700 lux in polyethylene terephthalate (PET) bottles with varying light transmittance to monitor the changes in...
article 2009
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Saffert, A. (author), Pieper, G. (author), Jetten, J. (author), TNO Kwaliteit van Leven (author)
This work is the second part of a milk study evaluating the effect of package light transmittance on the vitamin content of milk, in this case on UHT whole milk. The milk was stored at three different light intensities in polyethylene terephthalate (PET) bottles with varying light transmittance as described by Saffert et al. (2006). Changes in...
article 2008
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TNO Defensie en Veiligheid (author), van Dijk, R. (author), van der Houwen, E.H. (author), Maas, A.P.M. (author)
A phased-array FMCW radar has been design and built from COTS components. The generation of the frequency sweep is done by mixing a central local oscillator signal with a baseband sweep of a direct digital synthesizer (DDS). To ensure maximum flexibility the receive side has been equipped with it's own swept signal. The transmit frequency...
conference paper 2008
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Meta, A. (author), Hoogeboom, P. (author), Ligthart, L.P. (author)
The combination of frequency-modulated continuous-wave (FMCW) technology and synthetic aperture radar (SAR) techniques leads to lightweight cost-effective imaging sensors of high resolution. One limiting factor to the use of FMCW sensors is the well-known presence of nonlinearities in the transmitted signal. This results in contrast- and range...
article 2007
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Meta, A. (author), Hoogeboom, P. (author), Ligthart, L.P. (author)
The combination of Frequency Modulated Continuous Wave (FMCW) technology and Synthetic Aperture Radar (SAR) leads to lightweight, cost-effective imaging sensors of high resolution. In FMCW SAR applications the conventional stop-and-go approximation used in pulse radar algorithms can be not valid anymore, therefore the motion within the sweep...
conference paper 2006
Searched for: subject%3A%22Transmitters%22
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