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检索条件"主题词=Algorithm development"

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Architectural Design of the ARIEL FGS Software 6

Architectural Design of the ARIEL FGS Software

引用

Conference on Software and Cyberinfrastructure for Astronomy VI held as Part of SPIE Astronomical Telescopes and Instrumentation Conference

作者： Moesenlechner, G. Ottensamer, R. Luntzer, A. Reimers, C. Kerschbaum, F. Rataj, M. Skup, K. Univ Vienna Dept Astrophys Turkenschanzstr 17 A-1180 Vienna Austria Space Res Ctr CBK Bartycka 18A PL-00716 Warsaw Poland

ISBN: (纸本)9781510636927

The Atmospheric Remote-sensing Infrared Exoplanet Large-survey (ARIEL) is the latest addition as the M4 mission in the ESA Cosmic Vision programme. This mission will study the chemical composition of exoplanetary atmospheres via high resolution, multi-wavelength spectroscopy with high photometric precision. These tasks demand highly stable pointing during operation, which is provided by a dedicated Fine Guiding Sensor (FGS) instrument. The FGS uses two Mercury Cadmium Telluride (MCT) detectors operating in the 0.5-1.95 mu m range. The centroid measurements are provided to the spacecraft forming a closed loop in the guiding. In addition, the FGS detectors are also used for science including photometric and spectral windows. The instrument contains a Data Processing Unit (DPU) with a dual core LEON-based computer running the Instrument Application Software (IASW). The software implements a large number of ECSS services to fulfill the various operating needs. The mission-specific modes cover target acquisition and tracking tasks, processing of the photometric and spectral windows as well as various calibration modes. The science data need to be compressed in a lossless manner using algorithms previously developed for the ESA missions HERSCHEL and CHEOPS. While the science data processing has only soft real-timing needs, the centroiding is critical to run and provide results as fast as possible. We present the architectural design of the software particularly highlighting the low-level software adaptations needed to support the high demands from the centroid timing. The presented overview of the design is complemented with the expected performance of the algorithms.

关键词： Data processing algorithm development Space operation Control systems

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Simulation of point-like optical flashes in the sky

Simulation of point-like optical flashes in the sky

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12th IEEE-SPIE Symposium on Photonics and Web Engineering

作者： Piotrowski, LW Sokolowski, M Inst Phys Expt Warsaw Poland

ISBN: (纸本)081945415X

We present optimized performance of algorithms developed for detection of point like, visible light bursts in the sky. The algorithms based on analysis of series of consequtive images and detecting local differences between them were tested on simulated data obtained by inserting images of stars of different magnitudes at random positions. We discuss the choice of parameters which results in the maximal detection efficiency and simultaneously keeps the number of false detections as low as possible.

关键词： Stars Detection and tracking algorithms algorithm development Computer simulations Object recognition Optical simulations Atmospheric optics Electronics Satellites Shape analysis

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Measuring the chirp of an ultrashort laser pulse at the noise floor

Measuring the chirp of an ultrashort laser pulse at the nois...

引用

8th International Conference on Laser Beam Control and Applications

作者： Bender, DA Hasselbeck, MP Sheik-Bahae, M Univ New Mexico Dept Phys & Astron Opt Sci & Engn Program Albuquerque NM 87131 USA

ISBN: (纸本)0819461431

We extract the chirp of an ultrashort laser pulse accurately in real-time using a simple modified auto-interferometric correlation (MOSAIC) technique. Through the use of our newly developed time-domain algorithm, chirp information is accessible with signal-to-noise levels approaching unity. Correction algorithms have been developed to accommodate signal distortions due to bandwidth limitations, autocorrelator misalignment, and non-quadratic detector response.

关键词： algorithm development Sensors Signal to noise ratio Ultrafast phenomena Detection and tracking algorithms Interferometers Light emitting diodes Sapphire lasers Signal detection Interference (communication)

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EVALUATION OF HALF-TONE TECHNIQUES USING PSYCHOVISUAL TESTING AND QUANTITATIVE QUALITY MEASURES 3

EVALUATION OF HALF-TONE TECHNIQUES USING PSYCHOVISUAL TESTIN...

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CONF ON HUMAN VISION, VISUAL PROCESSING, AND DIGITAL DISPLAY 3

作者： MITSA, T Univ. of Iowa (United States)

ISBN: (纸本)0819408204

The quality of an image can be evaluated by performing a psychovisual test or by using quantitative quality measures. In order to assess the performance of different halftone techniques, gray scale images are halftoned in various ways and then presented to human viewers for quality evaluation. Quantitative quality criteria, such as edge correlation, mean square error and local error measures are also used for quality evaluation of the halftone images. Since the ultimate judges of image quality are human viewers, the success of these quantitative criteria as quality measures for halftones is assessed by comparing their results with the results of the psychovisual test.

关键词： Image quality Halftones Quality measurement Diffusion Visualization Image processing Human vision and color perception Binary data Image analysis algorithm development

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POLYGONAL-APPROXIMATION FOR THE ACQUIRED CONTOUR BY USING SPLINE

POLYGONAL-APPROXIMATION FOR THE ACQUIRED CONTOUR BY USING SP...

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CONF ON VISION GEOMETRY

作者： LEE, K Arizona State Univ. (United States)

In this paper, data reduction for the acquired contour is discussed. Lyche's knot-removal algorithm is introduced. For the given sets of points on the contour, we reduce the number of data points without distortin... 详细信息

ISBN: (纸本)0819410330

关键词： Tolerancing algorithm development Data acquisition OSLO Binary data Vision geometry Data processing Computer science Condition numbers Mining

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Approximations and fast algorithms

Approximations and fast algorithms

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Conference on Wavelets - Applications in Signal and Image Processing IX

作者： Beylkin, G Univ Colorado Dept Appl Math Boulder CO 80309 USA

ISBN: (纸本)0819441929

The key element in the design of fast algorithms in numerical analysis and signal processing is the selection of an efficient approximation for the functions and operators involved. In this talk we will consider approximations using wavelet and multiwavelet bases as well as a new type of approximation for bandlimited functions using exponentials obtained via Generalized Gaussian quadratures. Analytically, the latter approximation corresponds to using the basis of the Prolate Spheroidal Wave functions. We will briefly comment on the future development of approximation techniques and the corresponding fast algorithms.

关键词： Wavelets Signal processing Numerical analysis algorithm development Printed circuit board testing Condition numbers Image processing algorithms Matrices Applied mathematics

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Performance analysis of an asynchronous track fusion and architecture

Performance analysis of an asynchronous track fusion and arc...

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Conference on Signal Processing, Sensor Fusion, and Target Recognition VI

作者： Alouani, AT Rice, TR Tennessee Technological Univ. (United States) Naval Surface Warfare Ctr. (United States)

ISBN: (纸本)0819424838

In practice, Multisensor systems use dissimilar sensors having different data rates. Such sensors may also have inherent delays as well as communication delays. Recently the authors developed a track fusion algorithm that attempted to account for realistic constraints of sensor fusion. The objective of this paper are two folds. First, it shows that the synchronous track fusion problem can be derived as a special case of the developed track fusion algorithm. Second, using simulated target tracks, the performance of the asynchronous track fusion (ASTF) algorithm is analyzed and compared to an existing fusion algorithm. Different sensor data rates and communication delays are used in the simulations.

关键词： Sensors algorithm development Detection and tracking algorithms Data communications Monte Carlo methods Computer simulations Data processing Information technology Lithium Sensor fusion

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STUDY OF NIR IMAGING RECONSTRUCTION algorithm

STUDY OF NIR IMAGING RECONSTRUCTION ALGORITHM

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Conference on Quantification and Localization Using Diffuse Photons in a Highly Scattering Medium

作者： ZHANG, K ROLFE, P WICKRAMASINGHE, YABD KEELE UNIV DEPT BIOMED ENGN & MED PHYS STOKE ON TRENT ST4 7QB ENGLAND

ISBN: (纸本)0819413496

Monte Carlo simulation technique is used to study photon migration in biological tissues. On a 36 mm diameter cylinder, temporal point spread function is simulated for each of the seven detectors around the model. Information such as mean-time-of-flight, differential pathlength factor, and detected photon number are recorded. Two back-projection algorithms have been proposed to reconstruct tomographic images of phantom.

关键词： Tissues Sensors Reconstruction algorithms Photon transport Monte Carlo methods Scattering algorithm development Detection and tracking algorithms Near infrared Photodetectors

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SCHUR RLS ADAPTIVE FILTERING USING SYSTOLIC ARRAYS

SCHUR RLS ADAPTIVE FILTERING USING SYSTOLIC ARRAYS

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CONF ON ADAPTIVE SIGNAL PROCESSING

作者： STROBACH, P Siemens AG (Germany)

ISBN: (纸本)0819406937

An interpretation of the tracking behavior of fast RLS adaptive filters is given. It is shown that the overall performance of an RLS adaptive filter is solely dependent on the forgetting function, which is involved in coefficient updating. Fast RLS adaptive filters restrict themselves to simple exponential or rectangular forgetting functions. Their tracking behavior is quite limited and sometimes even disappointing when compared to the much simpler LMS algorithm. These limitations can be circumvented with the advent of Schur RLS adaptive filters which allow the application of arbitrarily shaped forgetting functions in the coefficient updating process. Schur RLS adaptive filters are closely connected to the theory of discrete transmission lines. They are flexible in their possible configuration and share excellent structural and numerical properties, which make them highly attractive candidates for concurrent implementations. Systolic arrays of the Schur RLS adaptive filters are presented and their performance is demonstrated with a typical example.

关键词： Digital filtering Filtering (signal processing) Signal processing Electronic filtering Radon Modulation Detection and tracking algorithms Digital signal processing algorithm development Receivers

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EFFICIENT EIGENVALUE COMPUTATION ON THE MASPAR 4

EFFICIENT EIGENVALUE COMPUTATION ON THE MASPAR

引用

4TH CONF ON ADVANCED SIGNAL PROCESSING algorithmS, ARCHITECTURES, AND IMPLEMENTATIONS

作者： HUO, Y SCHREIBER, R Princeton Univ. (United States) NASA Ames Research Ctr. (United States)

ISBN: (纸本)0819412767

Many applications of the eigenvalue decomposition of dense matrices are well known. This work was prompted by research in the numerical simulation of disordered electronic systems, in which one of the most common approaches is to diagonalize random Hamiltonian matrices in order to study the eigenvalues and eigenfunctions of a single electron in the presence of a random potential. In this paper, we describe an effort to implement a matrix diagonalization routine for real symmetric dense matrices on massively parallel SIMD computers, the Maspar MP-1 and MP-2 systems. Results of numerical tests and timings are also presented.

关键词： Matrices algorithm development Computer programming Computing systems Evolutionary algorithms Numerical simulations Electrical engineering Linear algebra Parallel computing Computer science

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