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Verwer, J. (author), Loeve, W. (author), Snijdoodt, E. (author), ten Dam, A. (author)In The Netherlands as a result of a national HPCN initiative a Foundation HPCN was established in 1995. The purpose of this Foundation is to stimulate structural and lasting cooperation of universities, technological institutes and industry in economically relevant applications of HPCN. Projects have been selected and since the beginning of 1996...report 1997
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Michiels, R.W.F.J. (author)This document describes the Client/Server system architecture of NARSIM - the NLR Air Traffic control Research Simulator- focussing on the socalled middleware: the infrastructure that enables all the seperate parts of the simulator to interact with each other. To show the full scope of the architecture, first a somewhat abstract architecture...report 1996
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Chu, Q.P. (author), Zwartbol, T. (author), van Woerkom, P.T.L.M. (author)The objective of the present paper is to give an overview of spacecraft attitude determination with GPS. GPS receivers with single or multiple antennas nowadays are low-cost sensors that constitute a valuable complement to existing sensor suites. GPS has been widely used for positioning and vehicle navigation. However, using GPS as an attitude...report 1995
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Zuidgeest, R.G. (author)This report provides an overview of the emerging technology Distributed Artificial Intelligence, in particular in the area of Distributed Problem Solving (DPS). DPS refers to coarse-grained (task-level) problem decomposition resulting in a number of expert or knowledge-based systems, generally called agents of which each exhibits some...report 1995
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van Dorp, A.L.C. (author)ARTEMIS (Africa Real-Time Environmental Monitoring Information System) is used by FAQ (Food and Agriculture Organisation of the United Nations) to support both its internal prograimnes on early warning and food security and desert locust control as well as developing countries in Africa by processing image information originating from the...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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Loeve, W. (author), Baalbergen, E.H. (author)In development of High Performance Computing and Networking (HPCN) for simulation applications several targets have to be realized. It is recpiired to maximize not only computational speed but also to maximize applicability in engineering environments. For applications in which HPCN-based simulations are economically and technically necessary...report 1994
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Noback, R. (author)Aspects of the requirements for and the calculation of design loads due to atmospheric disturbances are discussed. Special attention has been paid to the relation between discrete gusts and continuous turbulence. It is recommended that a worst case gust model, as described in this report, be further developed.report 1993
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Zuidgeest, R.G. (author)The human operator observing the real world is confronted with a huge amount of data from multiple sensors observing that world. Multi-sensor data fusion (MSDF) is one of the emerging fields in advanced information processing, concerned with fusing sensor data from these multiple sensors. Automated MSDF can help the operator by processing sensor...report 1992
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Moek, G. (author)In this report, the application of estimation theory to three problems from aerospace research is described. The applications considered deal with spacecraft attitude estimation, software reliability modelling and estimation, and with a satellite-based navigation algorithm. Maximum likelihood estimation is used in the software reliability case...report 1991
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Pinches, C.L. (author), Kuijpers, E.A. (author), Spaan, F. (author)Microgravity experiments operated using telescience concepts face certain constraints. The effect of these constraints on the focusing task are identified. Four types of focusing strategy, which provide a natural means of focusing in the presence of these constraints, are described. Three specific strategies are implemented as part of the...report 1991
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Kuijpers, E.A. (author)The Prototype Optical Diagnostic Instrument (PODI) has been extended to Teleoperated PODI (TelePODI) to allow for the study of telescience and image processing for microgee related instrumentation. TelePODI has been integrated in the Telescience Test Bed, phase I, at ESTEC to simulate remote control. Telescience pilot experiments have been...report 1990
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Kuijpers, E.A. (author)The breadboard called PODI (Prototype Optical Diagnostic Instrument) was developed following a study for a general facility for fluid experimental research on fluid physics in a space laboratory. PODI has been developed further for the study of telescience and image processing related to microgee instrumentation. The extended breadboard called...report 1990
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Blom, H.A.P. (author)Stochastic processes with a decision-directed control are considered as controlled Markov processes, the state space of which is hybrid; i.e. a product of a discrete set and a Euclidean space. This approach yields a mathematical model for many problems of decision-directed stochastic control. In general, the observations made from the "past" and...report 1990
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Looyen, W.J. (author)Working with Remote Sensing data can be generalized into four categories: - registration - processing - interpretation - presentation. A short overview of these four categories will be given. Emphasis will be put on the Dutch airborne multichannel pushbroom scanner CAESAR showing specific geodetic points of interest in working with Remote...report 1989
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van de Leijgraaf, R. (author), van Dorp, W.A. (author), Storm van Leeuwen, S. (author), Udo, R. (author)Today there is an increasing pressure on the fast delivery of a newly manufactured aircraft and on the strict guarding of its performance figures. It is therefore essential to reduce the necessary time between completion of the new aircraft and the moment of deliverance to an airline. This means that production flight testing time must be...report 1989
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Kordes, F.L.G. (author), Schuurman, J.J. (author)In order to get a better sight on the performance of compression and encryption algorithms under various conditions a simulation environment is needed. Within this simulation environment It must be possible to investigate the influence of code tables, channel characteristics and frame formats on the performance of the algorithms. In this report...report 1989
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Maccagno, T.M. (author)SiaN4 and SiC based advanced ceramics that have been produced by hot isostatic pressing (HIP'ing) have good potential to be used as hot section components in gas turbine aero engines. This report provides background for an NAE-SML investigation of this potential. The report begins with a general overview of the many fabrication methods that have...report 1989
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van der Laan, F.B. (author), Meijer, P.G. (author)This report gives the results of a study carried out in the Remote Sensing Department of the National Aerospace Laboratory (NLR) in The Netherlands concerning the updating of land use on topographic maps using remote sensing information. It was found that SPOT multispectral imagery is less suitable for land use classification purposes than...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