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Leus, G. (author), Van Walree, P.A. (author)A multiband OFDM transmitter and receiver are presented for underwater communications at low SNR. Compared with a single-band OFDMscheme, the multiband approach leads to a considerable reduction in the receiver complexity. The proposed system has been tested at sea with 16 subbands covering a total bandwidth of 3.6 kHz, at user data rates of 4.2...journal article
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Blenn, N. (author), Doerr, C. (author), Van Kester, B. (author), Van Mieghem, P. (author)As Online Social Networks (OSNs) become an intensive sub- ject of research for example in computer science, networking, social sci- ences etc., a growing need for valid and useful datasets is present. The time taken to crawl the network is however introducing a bias which should be minimized. Usual ways of addressing this problem are sampling...conference paper
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Daalhuizen, J. (author), Badke-Schaub, P. (author), Fokker, J. (author)Different approaches of design methodology that have been developed throughout the history of the design methods movement have produced many insights into the structure of the design process (Alexander, 1964; Simon, 1969; Schön. 1983; Hubka and Eder, 1987; Pahl and Beitz. 1984; Roozenburg and Eekels, 1995). It seems however, that little of this...conference paper
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Boersma, G. (author), Sonnenschein, F.J. (author)In this report the requirements of orbit control of geostationary communications satellites are investigated. A comparison between chemical and electrical propulsion is made for mission lives up to I5 years. The mass of electrical propulsion is lower than of chemical syetems, even when mass penalties for the low reliability of the ion thrusters...report 1974
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Vreeburg, J.P.B. (author)After a short introduction to various types of links and network organisations, the experimental phase in military satellite communications systems is expounded in a chronological discussion of early communications satellites. This experimental phase is considered to be ended with the TASCAT and IDCSP satellites. Present systems and systems of...report 1974
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Boersma, G. (author), Sonnenschein, F.J. (author)The potentials of a double glmballed mcwientum wheel as an actuator for the attitude oontrol of a geostationary communication satellite are discussed with respect to the related systems. A justification of the IXaW is given and the characteristics defining the wheel system are determined. They can serve to be the input to a detailed design of an...report 1975
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van Ingen Schenau, H.A. (author), Joosten, L.J.M. (author), Simons, J.L. (author)The study on image data security is directed to the requirement for exclusive access to satellite imagery in the concept of the Agricultiiral Real Time Imaging Satellite System (ARTISS). The security assessment indicates that user survey requests are handled confidentially and it shows the access vulnerability of the transmission of image data...report 1976
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van Ingen Schenau, H.A. (author), Nooren, G.J.L. (author)The dissemination of ERS-1 real-time thematic products via the Global Telecommunication System, the ECS satellite telecom system or the Eiuronet packet switching network is analysed and evaluated against the use of direct-receive L-band stations as used for NOAA weather image reception.report 1981
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Simons, H.J. (author), Roefs, H.F.A. (author)The class of (255, 255-2T) Reed-Solomon codes over CF(256) is studied in detail. In particular the encoding and decoding algorithms are elaborated. Main computational elements are the discrete Fourier transform for syndrome and error locator computation, Euclid's algorithm for solving the key equation and Horner's scheme for determining the...report 1983
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Simons, H.J. (author)This report describes the most relevant block- and convolutional codes to be used in satellite communication systems. Design trade-offs are given for the choice of coding techniques in SCPC, TDMA and SS-TDMA communication system,report 1985
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Versteeg, M.H.J.B. (author)This report describes the results of a feasibility study into some aspects of a proposed METEOSAT image data compression unit. The study was performed to support the preparation of a proposal for ESOC. For the considered algorithms (ESTEC 1 & MEANDER 1) an estimate of the needed processing power based on the 68000 instruction set was made. This...report 1986
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- Hagiwara, H. (author) doctoral thesis 1989
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Blom, H.A.P. (author)The expected growth of air traffic asks for large enhancements in continental Air Traffic Management (ATM) to increase capacity. From a technology point of view a multitude of 'solutions' are available, such as introducing air-ground datalink, providing better support to the ATCo (Air Traffic Controller), introducing 4D air traffic control,...report 1992
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Azzinaro, L. (author), Knepp, T. (author)In each chapter of this guide there are specific suggestions about what you can do to improve the quality of life in your home, in your neighborhood, and in the Bay. Learn how your daily routines affect the Bay Read the Baybook for easy-to-do suggestions about how you can help preserve and restore the Chesapeake Bayreport 1993
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- Ruffroberts, A.L. (author), Kuenen, J.G. (author), Ward, D.M. (author) journal article 1994
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NASA-NLR long-line experiment; a first step to connected Air Traffic Management research facilitiestvan den Bos, J.C. (author)A data-communication link via Internet has been established between the Crew-Vehicle Systems Research Facility (CVSRF) at the NASA Ames Research Center and the CTAS/NARSIM Simulation Facility (CNSF) at the NLR. Multiple simulated arrival flights of the Advanced Concepts Flight Simulator (ACFS) for Amsterdam Airport Schiphol in the Netherlands...report 1994
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Geschiers, J.P. (author)SOLEQS is a sequential three-dimensional multi-block multi-zone compressible Navier-Stokes solver, produced by NLR. In this paper is described how this large-scale application code in the order of 120,000 lines can be parallelized towards different computing platforms in a structured and manageable way. This paralellization is done step-wise,...report 1994
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Algra, T. (author)After surveying tele-education systems and technology, this study describes the design of a tele-education system which is particularly suitable for the extension of the educational facilities of universities to remote communities. The study is focused on the application of third-world small-scale institutes like the University of the...report 1994
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- Awater, G.A. (author) doctoral thesis 1994
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- Zigic, A. (author) doctoral thesis 1995