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New method for absolute shock calibration of accelerometers

New method for absolute shock calibration of accelerometers

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3rd international conference on Vibration Measurements by Laser Techniques

作者： Link, A von Martens, HJ Wabinski, W Phys Tech Bundesanstalt D-10587 Berlin Germany

ISBN: (纸本)0819428639

A new method for determining the dynamic behavior of accelerometers by shock excitation and laser interferometry is presented. The method allows the shock sensitivity and the magnitude and phase lag of the complex sensitivity of accelerometers to be measured with high accuracy (i.e. expanded measurement uncertainty less than or equal to 0.5 % for shock sensitivity). After digitizing of the phase-modulated signals at the output of a homodyne or heterodyne interferometer, the time-dependent displacement is reconstructed on the basis of the principle of coherent demodulation. The data processing steps proposed for determining peak value and spectrum of the acceleration si,anal can be adapted to typical shock pulse shapes. They efficiently suppress deterministic and stochastic disturbing quantities. Computer simulations and experimental investigations also proved that the peak value and the spectral components of shock-shaped accelerations can be measured with expanded uncertainties of less than 0.2 %. The method presented and investigated in this paper is widely used to evaluate the linearity of accelerometers within the specified dynamic range and to calibrate precision-grade accelerometers in absolute terms.

关键词： quadrature signal digital signal processing shock accelerometer interferometer calibration

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COSPAS-SARSAT satellite system

COSPAS-SARSAT satellite system

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international conference on Satellite Communications (ICSC)

作者： Y.G. Zurabov K.K. Ivanov A.D. Kuropyatnikov Morsviazsputnik Ministry of Transport of Russia Moscow Russia

COSPAS-SARSAT is an international satellite system designed to assist search and rescue operations using distress beacons operating on 121.5 MHz or 406 MHz and providing alert and location data to rescue coordination centres (RCCs). The system objective is to serve all organizations in the world with responsibility for search and rescue (SAR) operations, whether at sea, in the air, or on land. The COSPAS-SARSAT system was jointly developed and established by Russia (formerly the USSR), USA, Canada and France. The cooperation of the countries involved proceeded under the Memorandum of Understanding, signed in 1979. Following extensive testing and operation, an "international COSPAS-SARSAT Programme Agreement" was signed on 1 July 1988 in Paris by the governments of Russia, USA, Canada and France. This agreement established a framework for long-term operation of the system. The COSPAS-SARSAT system is used by all member states of the international Maritime Organization and the international Civil Aviation Organization. By May 1998 26 countries and/or competent organizations had officially joined the COSPAS-SARSAT programme.

关键词： Satellite broadcasting signal processing Table lookup Relays Real time systems Electronic mail System testing Government Space missions Space stations

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Use of FFT and ANN techniques in monitoring of transformer fault gases

Use of FFT and ANN techniques in monitoring of transformer f...

引用

international Symposium on Electrical Insulating Materials

作者： S. Birlasekaran G. Ledwich Department Electrical and Computer Engineering University of Newcastle Australia

This paper reports on continuing work undertaken by the authors in developing a portable monitor to detect multigases especially H/sub 2/ and CO dissolved in oil. A significant improvement in reliability of detection has been achieved using FFT and ANN signal processing techniques. The monitor uses the membrane and forced diffusion techniques to extract the dissolved gases in oil, and senses the gases by two thin film semiconducting gas sensors. Stability in sensor detection especially in a practical varying ambient conditions is achieved by a cyclic heating technique. And ac conductance measurement technique. Sensitivity and quantitative selectivity are achieved by signal processing using FFT and ANN techniques. The FFT resolves the frequency components of the sensor response up to 3rd harmonics and the data are used to train a back propagation ANN network to map the fingerprints. Detection up to 20 ppm has been achieved by just using two sensors. Detection for other gases like C/sub 2/H/sub 2/ and CO/sub 2/ has been done by using different membranes using the same two sensors and the measured response will be reported. A portable microcontroller based monitor was developed by incorporating in software the derived weights of ANN and the measuring techniques. The results are reported in this paper.

关键词： Monitoring Gas detectors Gases Petroleum signal processing Biomembranes Oil insulation Semiconductor thin films Thin film sensors Semiconductivity

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An object-oriented data cache architecture for programmable parallel digital signal processors 3

An object-oriented data cache architecture for programmable ...

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3rd international conference on Algorithms and Architectures for Parallel processing (ICA(3)PP)

作者： Kneip, J Univ Hannover Informat Technol Lab D-30167 Hannover Germany

ISBN: (纸本)0780342291

The paper describes concept and implementation of a data cache architecture with concurrent conflict free access to shared data for DSPs with parallel, synchronized processing units. It utilizes techniques known from object-oriented software design to achieve efficient and programmer friendly on-chip storage of data. The cache internally uses virtual 1D or 2D address spaces directly assigned to data structures instead of a conventional, linear address space. data within the cache are distributed to a number of memory banks. Virtual local addresses are used for data location and hit/miss detection to minimize cost and memory latency. The object-oriented cache is fully transparent to programmer and compiler, reduces the amount of address calculations to be performed, exploits the 2D spatial locality typical for image processing algorithms and can be integrated into a standard RISC processor pipeline.

关键词： Digital signal processors

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Beyond Concise and Colorful: Learning Intelligible Rules 3

Beyond Concise and Colorful: Learning Intelligible Rules

引用

3rd international conference on Knowledge Discovery and data Mining, KDD 1997

作者： Pazzani, Michael J. Mani, Subramani Shankle, W. Rodman Department of Information and Computer Science The University of California IrvineCA92697 United States Department of Neurology The University of California IrvineCA92697 United States

ISBN: (纸本)1577350278

A variety of techniques from statistics, signal processing, pattern recognition, machine learning, and neural networks have been proposed to understand data by discovering useful categories. However, research in data mining has not paid attention to the cognitive factors that make learned categories intelligible to human users. We show that one factor that influences the intelligibility of learned models is consistency with existing knowledge and describe a learning algorithm that creates concepts with this goal in mind. Copyright © 1997, American Association for Artificial Intelligence (***). All rights reserved.

关键词： signal processing

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1997 3rd international conference on Algorithms and Architectures for Parallel processing, ICA3PP 1997

1997 3rd International Conference on Algorithms and Architec...

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3rd international conference on Algorithms and Architectures for Parallel processing, ICA3PP 1997

ISBN: (纸本)0780342291

The proceedings contain 62 papers. The topics discussed include: adaptive routing for a bus-based multiprocessor;multi-node broadcasting in hypercubes and star graphs;calculating optimal flit size and upper limit on the performance of wormhole routing;prioritized physical channel scheduling in wormhole networks;an object-oriented data cache architecture for programmable parallel digital signal processors;a systolic architecture for sorting an arbitrary number of elements;virtual parallel processors;parallel information retrieval on a distributed memory multiprocessor system;modeling and evaluation of a new cluster-based system for commercial applications;a simulator construction methodology for the shiva multiprocessor system;and Dycos - a customizable kernel architecture supporting distributed operating environments.

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A Unified Notion of Outliers: Properties and Computation 3

A Unified Notion of Outliers: Properties and Computation

引用

3rd international conference on Knowledge Discovery and data Mining, KDD 1997

作者： Knorr, Edwin M. Ng, Raymond T. Department of Computer Science University of British Columbia VancouverBCV6T 1Z4 Canada

ISBN: (纸本)1577350278

As said in signal processing, "One person's noise is another person's signal."For many applications, such as the exploration of satellite or medical images, and the monitoring of criminal activities in electronic commerce, identifying exceptions can often lead to the discovery of truly unexpected knowledge. In this paper, we study an intuitive notion of outliers. A key contribution of this paper is to show how the proposed notion of outliers unifies or generalizes many existing notions of outliers or generalizes many extests for standard statistical distributions. Thus, a unified outlier detection system can replace a whole spectrum of statistical discordancy tests with a single module detecting only the kinds of outliers proposed. A second contribution of this paper is the development of an approach to find all outliers in a dataset. The structure underlying this approach resembles a data cube, which has the advantage of facilitating integration with the many OLAP and data mining systems using data cubes. Copyright © 1997, American Association for Artificial Intelligence (***). All rights reserved.

关键词： data mining

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Use of F-code as a very high level intermediate laguage for DSP

引用

3rd international conference on Parallel processing, Euro-Par 1997

作者： Willink, Edward D. Shafarenko, Alexander V. Muchnick, Vyacheslav B. Racal Research Limited Worton Drive Reading United Kingdom Department of Electronic and Electrical Engineering University of Surrey Guildford United Kingdom

ISBN: (纸本)9783540634409

Block diagram languages provide an effective approach to developing Digital signal processing applications. The tools that support block diagram languages use existing compilation systems to produce code. The inefficiencies of the compilation systems are compounded with inefficiencies interfacing to them. Generation of intermediate code direct from the block diagram bypasses these inefficiencies. We describe the direct generation of F-code, a very high level intermediate language developed for data parallel applications.

关键词： Digital signal processing

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An ML-like module system for the synchronous language signal

引用

3rd international conference on Parallel processing, Euro-Par 1997

作者： Nowak, David Talpin, Jean-Pierre Gautier, Thierry P., Le Guernic IRISA INRIA-Rennes and CNRS Campus de Beaulieu F-35000 Rennes France

ISBN: (纸本)9783540634409

Synchronous languages, such as signal, are best suited for the design of dependable real-time systems. Synchronous languages enable a very high-level specification and an extremely modular implementation of complex systems by structurally decomposing them into elementary synchronous processes. Separate compilation in reactive languages is however made a difficult issue by global safety requirements. To enable separate compilation of the functional components of reactive systems while preserving their global integrity, we introduce a module system for signal. Just as data-types describe the invariants of program modules in functional languages, temporal and data-flow invariants interface signal processes to their environment. In conventional languages, typing is the medium allowing the separate compilation of functions in a program. In signal, the notion of conditional data-flow graph can similarly be used for separately compiling reactive processes and for assembling them in complex systems. Following this principle, we present the first design and implementation of a polymorphic type system and of a module system for the synchronous language signal.

关键词： data flow graphs

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On progress toward information extraction methods for hyperspectral data

On progress toward information extraction methods for hypers...

引用

3rd Spectrometry conference

作者： Landgrebe, D School of Electrical and Computer Engineering Purdue University West Lafayette IN 47907-1285 United States

ISBN: (纸本)0819425400

A focused research program has been under way for several years to discover optimally effective means for analysis of multispectral and hyperspectral data. The methods pursued are based upon fundamental principals of signal theory and signal processing. The basic approach revolves around viewing N spectral bands of data from a pixel as a single point in N dimensional space, thus, an important aspect of the work has been to discover unique aspects of higher dimensional spaces which can be exploited for their information-bearing aspects. Substantial progress on this problem has been made in the last several years, with several key algorithms having been defined. Among these are algorithms for transforms which define optimal case-specific features, and which improve the ability of the classifier to generalize. A more fundamental finding has been to understand the characteristics of high dimensional space and the significance of design samples and their use in defining the classifier. These results have been published in separate papers over the last several years. The purpose of this paper is to survey these results and to show how they relate to one another in achieving an effective overall analysis procedure for analyzing a hyperspectral image data set.

关键词： hyperspectral multispectral data analysis information extraction

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