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iee colloquium on computer modelling and simulation of radar systems

作者： C. Mobsby D. Newton M. Pymm K. Youern DRA Portsdown Defence Research Agency Portsmouth UK Logica Defence and Civil Government Limited Cobham Surrey UK

A model to determine the detection performance of an integrated sensor suite was specified by the Defence Research Agency (DRA) Portsdown and produced by Logica Defence & Civil Government Ltd. The model interfaced with data arrays representing each sensor and provided performance measures for phased array radars and other active and passive sensors against specific target parameters, environmental conditions and electronic warfare activity. The model was written using object oriented software techniques in C++ to run on an IBM PC under Microsoft Windows. The results of model runs are displayed dynamically using a dynamic data exchange (DDE) link to an Excel spreadsheet. A map is displayed illustrating how the scenario evolves the time. The main benefits of using Windows are that the user can readily define what ships and aircraft are in the scenario and the equipment fitted. The platform's position, movement and equipment events are also specified as part of a consistent user interface.< >

关键词： Phased arrays Military computing Object oriented methods radar antennas radar

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simulation of radiation from a microstrip antenna using three-dimensional finite-difference time-domain (FDTD) method

Simulation of radiation from a microstrip antenna using thre...

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8th International Conference on Antennas and Propagation. Part 2 (of 2)

作者： Buchanan, W.J. Gupta, N.K. Arnold, M. Napier Univ Edinburgh United Kingdom

ISBN: (纸本)0852965710

Three-Dimensional Finite-Difference Time-Domain (3D FDTD) method has been successfully applied to structures such as Microstrip and waveguides to determine characteristics such as input impedance and scattering parameters. The FDTD method has also been applied to other applications such as the study of electromagnetic pulse (EMP) interaction with targets, radar cross section (RCS) calculations and to biological applications. One problem in modelling microstrip antennas is that these structures are highly resonant. The authors in this paper have described techniques to reduce this problem and have also given methods to improve accuracy and to reduce run-times. These methods include sub-gridding around discontinuities and parallel processing. The authors have carried out modelling on three computer systems (an HP400, A 486-based PC and a 386-based PC with a transputer array) and they conclude with their opinion that the 3D FDTD method is an efficient and accurate technique to model microstrip antennas.

关键词： Microstrip antennas

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modelling of a point-to-multipoint (P-MP) fixed cellular millimetric ration system

Modelling of a point-to-multipoint (P-MP) fixed cellular mil...

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iee colloquium on Communications simulation and modelling Techniques

作者： R.E. Ramos S.A. Sorensen A.H. Aghvami Communication Research Group Department of Electrical and Electronic Engineering King's College London University UK Department of Computer Science University College London University UK

The problems related to the design of a suitable radio access (RA) strategy are identified and explained. The formulation of a model, to examine the behaviour of circuit switched multiplexing protocols in conjunction with the chosen TDMA/TDM based RA technology, and its ability to carry a limited set of multi-rate voice, data and video traffic types, found in an urban business environment is described. A brief description is given of the evaluation technique. Process based event driven simulation, and the simulation tool developed.< >

关键词： Land mobile radio cellular systems Circuit switching (communication systems) Protocols Communication system software Time division multiaccess

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Specification, modelling and verification of concurrent discrete event systems

Specification, modelling and verification of concurrent disc...

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iee colloquium on Discrete Event systems: A New Challenge for Intelligent Control systems

作者： W. Reisig Computer Science Department Technical University Munich Munich Germany

The traditional description of dynamic change in terms of (continuous) functions appears quite natural for many purposes. It is nevertheless not convenient when it comes to the analysis of particular system properties. This talk exemplifies some of those properties and provides techniques to adequately specify, model and verify them.< >

关键词： Discrete event simulation

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Enterprise simulation and modelling using a language knowledge-base

Enterprise simulation and modelling using a language knowled...

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iee colloquium on AI (Artificial Intelligence) in Enterprise modelling

作者： J. Tansley Edinburgh Technology Transfer Centre Teallach Limited

Contracting is a complex decision process that involves the sifting and evaluation of masses of information, culminating in a set of contracts, each of which is a concise summary of: healthcare needs and outcomes; and the work-load for a lot of people over a long period of time. The author describes the use of Ep:Script knowledge base for planning evaluating and testing contracts. EpiScript is a clinically oriented computer language that can be used to describe, separately for each disease, the medical and resource related activities that take place during any healthcare treatment programme. EpiScript has well defined semantics and a sound type system. Its structure is such that parsing can ensure syntactic correctness. Most importantly, EpiScript is a process language.< >

关键词： Decision support systems simulation Medical services High-level languages Knowledge based systems

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Coloured Petri nets

Coloured Petri nets

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iee colloquium on Discrete Event systems: A New Challenge for Intelligent Control systems

作者： K. Jensen Dept. of Comput. Sci. Aarhus Univ. Denmark

Coloured Petri nets (CPN) is a formalism which extends ordinary Petri nets by adding data types and modularity. This means that is possible to make succinct, readable and structured models. The CPN models may be investigated by means of simulation. However, the models may also be validated by a number of mathematical analysis techniques, such as state graphs and invariants. The modelling, simulation and analysis by means of CPN are supported by a set of commercially available computer tools called Design/CPN. CPN models have been used in a large range of different application areas, some of which are listed. Design/CPN uses the functional programming language Standard ML to specify data types, functions and data manipulations. 12 properties of CPN are presented.< >

关键词： simulation Petri nets

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TLM MODELING USING AN SIMD computer

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INTERNATIONAL JOURNAL OF NUMERICAL modelling-ELECTRONIC NETWORKS DEVICES AND FIELDS 1993年第4期6卷 299-304页

作者： TAN, CC FUSCO, VF The Queen's University of Belfast Department of Electrical & Electronic Engineering Ashby Building Stranmillis Road Belfast BT9 5AH U.K. Chun Chia Tan obtained a first-class honours degree from The Queen's University of Belfast. He was awarded an IEE prize for best final-year project. His current research interests include the modelling of electromagnetic fields using parallel processing techniques. At present Mr Tan is working as an electrical engineer in Malaysia. Vincent F. Fusco was educated at The Queen's University of Belfast where he obtained the degree of Ph.D. He has worked as a research engineer on short-range radar and radio telementry systems. Currently he is a Reader in Microwave Commnications in the School of Electrical Engineering and Computer Science The Queen's Univeristy of Belfast. His current research interests include non-linear microwave circuit simulation and concurrent programming techniques for electromagnetic field problems. He has acted as consultant to a number of major companies and has published numerous research papers in these areas. He is author of the bookMicrowave Circuits Analysis and Computer Aided Design(Prentice Hall 1987). Dr Fusco is a Chartered Electrical Engineer and a Member of the Institute of Electrical Engineers.

A major limitation of the transmission-line matrix (TLM) method used to solve Maxwell's equations is the long computation time required. The TLM scattering calculations involved can, however, be viewed as parallel in nature. This paper describes an effort to reduce computational time by using an SIMD, DAP multiprocessor computer employed to solve a two-dimensional TLM electromagnetic field formulation. A parallel algorithm based on the TLM scattering algorithm is designed and implemented using FORTRAN-PLUS Enhanced on an AMT DAP 510 machine. Here the connectivity of the DAP is exploited to simulate the intrinsic scattering behaviour on which the TLM algorithm relies. The results show that parallel processing on an SIMD machine such as the DAP is advantageous, especially for higher-order mesh sizes.

关键词： Electric lines

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Agent-oriented modelling and simulation for discrete event systems

Agent-oriented modelling and simulation for discrete event s...

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iee colloquium on Discrete Event Dynamic systems - A New Generation of modelling, simulation and Control Applications

作者： M. Beynon Yun Pui Yung Department of Computer Science University of Warwick Coventry UK

A modelling technique that relates concurrent system behaviour to agent interaction at a high level of abstraction is outlined. This exploits two complementary programming paradigms: agent-oriented and definition-base... 详细信息

关键词： Discrete event simulation Rail transportation

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simulation of a modular power distribution system

Simulation of a modular power distribution system

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iee colloquium on CAD of Power Electronic Circuits

作者： P.R. Wilson Power and Control Group Radar Systems Division GEC-Ferranti Defence Systems Limited Edinburgh UK

The design of a large power distribution system has several problems not least of which is the problem of prototyping a large system cost-effectively. This leads to a greater emphasis on the use of CAD techniques for design proving. This in itself has pitfalls such as the excessive simulation times that would be required for large networks of primitive circuits which necessitates the use of behavioural modelling techniques. The author describes an approach to modelling such a system and presents some results of the simulations of such systems. The SABER simulator was chosen as it was the simulator in everyday use within the Power and Control group, and the libraries supplied as standard included all the models that were required to complete initial simulations of behavioural power supplies. The simulations required were transient and small signal AC analyses.< >

关键词： simulation

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Jackson System Development

Jackson System Development

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1992 iee colloquium on an Introduction to Software Design Methodologies (Digest No: 1992/129)

作者： A.L. Rollo Software Engineering at Luton College of Higher Education

Jackson System Development is a method that has at its basis the assertion that any computer system is in reality a model of some portion of the real world. The Jackson method is a technical method that is limited to the software life cycle. The author discusses the modelling stage of the Jackson method which is concerned with depicting the subject matter of the system. He considers a case study of a radar training simulator.< >

关键词： simulation Software engineering System analysis and design

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