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Punselie, B. (author)After showing that D2-HDMAC would benefit from an increase in the data capacity, a technique for doubling the data capacity in D2-HDMAC has been developed. The influence of distortions and disturbances on the bit error rate of the original digital signal in D2- HDMAC has been investigated for comparison with the increased data rate signal.master thesis 1993
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De Groote, M.J. (author)In this report we investigated the possibility of using an FM broadcast channel for transmission of digital data to mobile terminals. We studied two existing systems: the Radio Data System (RDS) and the Digital Audio Broadcasting system (DAB). In DAB the modulation method OFDM (Orthogonal Frequency Division Multiplexing) is used. We tried to...master thesis 1992
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- Brand, A.J. (author) doctoral thesis 1992
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De Boer, T. (author)The time between request and realization of private or leased lines (i.e. provisioning time) has traditionally been very long (i.e. months). To a large extent, this has to do with the inflexibility of the "conventional" transport network. With the availability of Digital Cross-connect Systems (DCS) and other network products based on the...master thesis 1991
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- Schellekens, J.C.J. (author), De Borst, R. (author) conference paper 1991
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Gronovius, M.F. (author)Due to a combination of a market pull and a technology push a new transmission standard, called SDH (Synchronous Digital Hierarchy), has evolved. A transport network based on Digital Cross-Connect Systems, Drop & Insert Multiplexers and other SDH based products offers great network flexibility. This network flexibility can be used for the...master thesis 1990
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van de Plassche, R.J. (author)Analog-to-digital and digital-to-analog converters are important building blocks connecting the analog world of transducers with the digital world of computing, signal processing and data acquisition systems. In chapter two the converter as part of a system is described. Requirements of analog filtering of input signals before they are applied...doctoral thesis 1989
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Prins, J.J.M. (author), Dieleman, P. (author), de Jong, H. (author)The Hermes manipulation system (HERA) is a sophisticated space manipulator system, which has to perform tasks ranging from berthing to tool operation in various operational modes from fully automatic to purely manual. The HERA system main contractor is Fokker Space & Systems B.V. (FSS). Development and qualification of such a space-based...report 1989
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Noback, R. (author)A method is described to generate a random Gaussian process with a power spectrum with fractional power, for example the von Karman spectrum for atmospheric turbulence. The method uses digital filtering of a white noise process and it is based on the use of fractional derivatives. An algorithm to generate the process is presented.report 1988
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Schuring, J. (author)Current design methods for digital control systems to be operated in a continuous environment do not always result in the most efficient use of digital computing hardware. To improve this situation, a dedicated frequency response analysis method was developed for hybrid systems. For practical use of the method, it has been expanded to an...report 1987
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Pouwels, H. (author), Aartman, L.J. (author)The National Aerospace Laboratory "NLR" is the operator of an aircraft which can be equipped with either a SLAK, a multl spectral scanner or a TVbased scanner. The airborne recording equipment la designed to accommodate these various sensors. The general airborne system setup is: the sensor, a dedicated digitizing unit and an Interface to a High...report 1986
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van Woerkom, P.T.L.M. (author)Software design for digital computer simulation of the dynamics of flexible spacecraft equipped with actuators and sensors, should take into account two properties of the overall system: (i) s.ampled-data control of the spacecraft leads to discontinuous inputs (forcing functions) in the differential equations of motion, thereby requiring...report 1983
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Dekker, G.J. (author)Modern commercial transport aircraft contain digital avionics systems for more and more safety critical functions. The reliability and safety of those new systems depend on the hardware reliability and on the reliability of the embedded software. In this report, an overview is given of available methods and techniques to develop reliable...report 1982
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Terpstra, A.P. (author), van den Dam, R.F. (author), van Woerkom, P.T.L.M. (author), Zwartbol, T. (author)This document describes two computer programs developed during a study of the application of modern control techniques in the area of spacecraft attitude control. Theory and simulation results are described in part I of this report. In part II a general overview of the tasks of the simulation program is presented, and program design aspects are...report 1982
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Prins, J.J.M. (author)The increasing power of on-board processors allows more freedom in the design and operation of reaction wheel control systems. This report discusses several performance and implementation aspects of the operation of wheel systems which have their own internal feedback control system. A model following control concept is found to be superior. The...report 1982
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Abbink, F.J. (author)Modern avionics are an integral part of the aircraft. They provide the functions of communication, navigation, energy management, identification, weather, terrain, and collision avoidance, the presentation of flight and warning data as well as aircraft guidance and stabilization. New developments in micro-electronics and display technology...report 1980
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Van der Kraan, J.G. (author), Rietveld, H. (author), Tienstra, M. (author), IJzereef, W.J.H. (author)For the effective performance of its work, the Rijkswaterstaat, which has a staff of about 12.000, consists of 25 Directorates with different duties. One of them is the Meetkundige Dienst (Survey Department) with a staff of about 500, which is charged with the geodetic support of the Rijkswaterstaat. Part of this support is the preparation of...report 1980
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Traas, C.R. (author)The report reviews a number of digital filtering methods and gives examples of their application. The methods include batch processing methods and rec\irsive methods, not only in the classical formulations but also in square-root formulations. The latter formulations have the purpose to prevent certain numerical inconveniences. Much attention is...report 1976
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Prins, J.J.M. (author)The existing fine attitude system of the Astronomical Netherlands Satellite was designed on the basis of conventional digital control techniques. The possibility of a more advanced approach is presented in this report. As an example, an alternative control algorithm for the scan mode has been developed with the use of state estimation and state...report 1976
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- van-Herk, A. (author), Wesseling, P. (author) conference paper 1974