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SYNTHETIC APERTURE SONAR FOR SEABED IMAGING - RELATIVE MERTIS OF NARROW-BAND AND WIDE-BAND APPROACHES

IEEE JOURNAL OF OCEANIC ENGINEERING 1992年第1期17卷 95-105页

作者： CHATILLON, J BOUHIER, ME ZAKHARIA, ME IFREMER TOULON FRANCE

This paper describes the advantages of using wide-band sonar systems in underwater acoustical imaging by means of synthetic aperture (side-looking) sonars. These advantages will be illustrated through simulation examples. The simulations are conducted in two cases of sonar platform motion: perfect trajectory and disturbed trajectory. We will investigate several schemes used for wide-band synthetic aperture processing and evaluate their relative merits (resolution and complexity) in the case of both disturbed and perfect trajectories. Quantitative image evaluation is initially achieved through the evaluation of performance as regards resolution. The problems involved in the definition of the image quality are then discussed.

关键词： SYNTHETIC APERTURE SIDE-LOOKING SONAR WIDE-BAND signal processing ACOUSTICAL IMAGING UNDERWATER ACOUSTICS NAVIGATIONAL INACCURACY

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performance prototyping: a simulation methodology for software performance engineering

Performance prototyping: a simulation methodology for softwa...

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CompEuro

作者： M. Baker W. Shih Workstation System Laboratory IBM Thomas J. Watson Research Center Yorktown Heights NY USA

The authors describe a modeling methodology that extends software performance engineering to handle large multitasking applications. The objective was to provide throughput projections and design evaluation for a development team building an image/fax server intended to function in a larger distributed image processing application. Software performance engineering is reviewed. The methodology described integrates analytic modeling with real-time simulation to construct a performance prototype. The application of the methodology to the performance engineering of the image/fax server is reported.< >

关键词： Software prototyping Virtual prototyping Software performance Design engineering Application software Multitasking Throughput Buildings image processing performance analysis

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simulation of SIMD and MIMD shared memory architectures on Unix-based systems

Simulation of SIMD and MIMD shared memory architectures on U...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： L. Sousa M. Piedade Faculty de Ciências e Tecnologia UNL Monte de Caparica Portugal Electrical Engineering Department IST Lisboa Portugal

A set of tools to simulate SIMD (single instruction multiple data) and MIMD (multiple instruction multiple data) shared memory architectures on multitasking sequential systems is presented. The main objective of these tools is to evaluate parallel computing systems. As is well known, the performance of the parallel algorithms, unlike that of serial algorithms, is very machine dependent. The simulation is based on an algorithm-driven approach, allowing the test and evaluation of algorithms for this type of architecture. The evaluation of the algorithms is done at run-time, making possible the acquisition of very realistic results. Different levels of evaluation can be applied. More accurate results are achieved at the expense of more simulation time. simulation tools have been developed in C language for Unix based systems, assuring portability among a large class of computing systems. The tools presented have been extensively used to simulate orthogonal multiprocessing systems, especially for the development and simulation of several image processing algorithms. Experimental results show that a good approach to the real system operation has been achieved.< >

关键词： Memory architecture Computational modeling Multitasking Parallel processing Parallel algorithms Testing Computer architecture Runtime Multiprocessing systems image processing

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A simulation-Based Method for Fault Tolerance evaluation

A Simulation-Based Method for Fault Tolerance Evaluation

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Southeastern Symposium on System Theory

作者： C.O. Scheper R.L. Baker Center for Digital Systems Research Research and Triangle Institute NC USA

Digital computing systems are used in many applications to perform functions whose correct execution is critical to the application, to the mission the application is a part of, or to human life and safety. This has led to an emphasis on the dependability of computing systems, i.e., whether or not justifiable reliance can be placed upon the service delivered by the system. There can be many factors defining dependability for a particular system, including performance, functionality, fidelity, reliability, maintainability, availability testability, fault tolerance, safety, security, and life-cycle cost. These factors interact with each other in ways that can be mutually diminishing and that can result in an undependable system. Therefore, a rigorous dependable system design validation and verification methodology is required. This paper addresses one of the necessary components of such a methodology for highly reliable systems: fault tolerance evaluation. We define fault tolerance evaluation to be those activities that assure that appropriate fault tolerance mechanisms are designed and implemented to provide the required level of system reliability, and propose an approach for using directed graph simulation models, behavioral simulation models, and semi-Markov analytic models during the early- to mid-stages of design for fault tolerance evaluation.

关键词： Fault tolerance Fault tolerant systems Cost function Safety Analytical models Redundancy Computational modeling Digital systems Humans Life testing

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Parameter estimation for linear multidimensional non-Gaussian signals

Parameter estimation for linear multidimensional non-Gaussia...

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International Conference on Acoustics, Speech, and signal processing (ICASSP)

作者： J.K. Tugnait Department of Electrical Engineering Aubum University Auburn AL USA

The author considers the problem of estimating the parameters of a general (possibly asymmetric noncausal and/or nonminimum phase) two-dimensional autoregressive moving average random field model driven by an independent and identically distributed two-dimensional non-Gaussian sequence. Several inverse filter criteria were recently considered for parameter estimation of the system parameters given only the output measurements (image pixels). These criteria were shown to yield strongly consistent parameter estimates. The focus is on the computational aspects. A computer simulation example is presented to illustrate the performance of the proposed approach.< >

关键词： Parameter estimation Multidimensional systems Higher order statistics Parametric statistics Transfer functions Computational modeling Computer simulation Phase estimation Filters Pixel

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A DSP based tool for industrial drive control systems

A DSP based tool for industrial drive control systems

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AFRICON Conference

作者： C. Cavallaro E. Curruto A. Consoli A. Raciti A. Testa Dipartimento Elettrico Elettronico e Sistemistico Universià di Catania Catania Italy Universita degli Studi di Catania Catania Sicilia IT

A development system for new control schemes for electrical drives has been realized and tested. The system can be used either as a simulation environment for the development of control algorithms or as a real-time test facility for experimental evaluation of the performance of several control schemes. It allows an immediate practical evaluation of control strategy performances for various kinds of AC and DC drives. The control program is written in C and does not need modifications by moving from simulations to the real-time operations. This makes possible an easy and fast practical evaluation of the drive control performances, taking advantage of the test facility integrated in the development system and composed of two independent drives mechanically coupled.

关键词： Digital signal processing Electrical equipment industry Industrial control Control systems Computational modeling Power system modeling Test facilities Real time systems Transducers System testing

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WIND-TUNNEL MODEL AIRCRAFT ATTITUDE AND MOTION ANALYSIS

WIND-TUNNEL MODEL AIRCRAFT ATTITUDE AND MOTION ANALYSIS

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CONF ON signal and image processing systems performance evaluation, simulation, and modeling

作者： MOSTAFAVI, H TAU Corp. (United States)

ISBN: (纸本)0819405922

A model-based approach to estimating the position and pitch-roll-yaw of the model aircraft in a vertical wind tunnel used to study the aircraft spin characteristics. The video image sequence of the model during flight is digitally analyzed for detection and tracking of target markers installed on the model. The geometric model of these targets is represented by their coordinates relative to the model reference coordinates. The six degrees of freedom (six DOF), namely, the pitch-roll-yaw and the 3-D position, is estimated using the camera model and iterative minimization of the distance in the image plane between the target points and the projected model points. Using prediction of the six DOF for the next video frame, the estimation procedure is repeated in a six DOF tracking loop that utilizes the dynamic as well as the geometric model of the target. The six DOF estimation and target tracking has been implemented on a real-time image processing workstation based on the Sun SPARC architecture. Interactive graphics and video image processing is used for initial designation of the approximate six DOF by the operator, followed by automatic tracking which dynamically displays the stick figure of the model aircraft on the grey-level video sequence.

关键词： Video Cameras Motion models systems modeling 3D modeling image processing Video processing Calibration performance modeling Model-based design

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performance evaluation of a texture-based segmentation algorithm

Performance evaluation of a texture-based segmentation algor...

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signal and image processing systems performance evaluation, simulation, and modeling

作者： Sadjadi, Firooz A. Honeywell Systems and Research Cent. St. Anthony MN USA

ISBN: (纸本)0819405922

Texture segmentations are crucial components of many remote sensing, scene analysis, and object recognition systems. However, very little attention has been paid to the problem of performance evaluation in the numerous algorithms that have been proposed by the image understanding community. In this paper, a particular algorithm is introduced and its performance is evaluated in a systematic manner on a wide range of scene and scenarios. Both the algorithm and the methodology used in its evaluation have significance in numerous applications in the computer-based image understanding field.

关键词： image processing

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evaluation of image tracker algorithms

Evaluation of image tracker algorithms

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signal and image processing systems performance evaluation, simulation, and modeling

作者： Marshall, William C. Honeywell Systems and Research Cent. Columbia Heights MN USA

ISBN: (纸本)0819405922

This paper presents the results of applying a digital simulation of three conventional image-tracking algorithms to the task of tracking a synthetic target image in the presence of both moving background clutter and sensor noise. The background clutter model is based on two-dimensional correlated noise equations and is repeatable for each test. The Fortran listings of the clutter algorithm are given. Centroid, correlation, and a feature-matching algorithms were used for testing, with a simple criterion for adequacy of tracking. Results are shown with clutter signal-to-noise ratio (SNR) plotted against sensor SNR, which illustrates the relative merit of each tracking algorithm.

关键词： image processing

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Lab. development of a nonlinear optical tracking filter

Lab. development of a nonlinear optical tracking filter

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signal and image processing systems performance evaluation, simulation, and modeling

作者： Block, Kenneth L. Whitworth Jr., Ernest E. Bergin, Joseph E. S. Systems Corp. Albuquerque NM USA

ISBN: (纸本)0819405922

Experimental results are presented for a nonlinear optical pre-processing filter built and demonstrated to remove transient objects from images sent to a track processor. This filter could be used to enhance track maintenance of point source and small extended objects. Operationally, the nonlinear optical technique accommodates unwanted track image effects such as signal loss, scene saturation, and multiple false signals.

关键词： image processing

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