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Wideband relax and wideband clean for aeroacoustic imaging

Wideband relax and wideband clean for aeroacoustic imaging

引用

9th AIAA/CEAS Aeroacoustics Conference and Exhibit, 2003

作者： Wang, Yanwei Li, Jian Stoica, Petre Sheplak, Mark Nishida, Toshikazu Department of Electrical and Computer Engineering University of Florida P. O. Box 116130 Gainesville FL 32611 United States Department of Systems and Control Uppsala University P. O. Box 337 SE-75105 Uppsala Sweden Department of Mechanical and Aerospace Engineering University of Florida Gainesville FL 32611 United States

ISBN: (纸本)9781624101021

Microphone arrays can be used for acoustic source localization and characterization in wind tunnel testing. In this paper, we present the wideband RELAX (WB-RELAX) and the wideband CLEAN (WB-CLEAN) algorithms for aeroacoustic imaging using an acoustic array. WB-RELAX is a parametric approach that can be used efficiently for point source imaging without the sidelobe problems suffered by the delay-and-sum beamforming approaches. WB-CLEAN does not have sidelobe problems either but it behaves more like a nonpara-metric approach and it can be used for both point source and distributed source imaging. Moreover, neither of the algorithms suffers from the severe performance degradations encountered by the adaptive beamforming methods when the number of snapshots is small and/or the sources are highly correlated or coherent with each other. The performance of WB-RELAX and WB-CLEAN is demonstrated by applying them to measured data obtained at the NASA Langley Quiet Flow Facility using a small aperture directional array (SADA). Somewhat surprisingly, using these approaches, we were not only able to accurately determine the parameters of the dominant source, but also discovered a highly correlated multipath of the dominant source. © 2003 by Jian Li.

关键词： Aeroacoustics

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Mean square error optimality of orthogonal space-time block codes

Mean square error optimality of orthogonal space-time block ...

引用

IEEE International Conference on Communications (ICC)

作者： E.G. Larsson P. Stoica Department of Electrical and Computer Engineering University of Florida Gainesville FL USA Department of Systems and Control University of Uppsala Uppsala Sweden

Linear space-time block coding (STBC) is a conceptually simple transmission technique for channels with multiple transmit and receive antennas. In this paper, we study a subclass of linear STBC, namely orthogonal STBC (OSTBC), with the primary goal of contributing towards a complete understanding of OSTBC. In particular, we prove that OSTBC is optimal in an important minimum mean-square error (MSE) sense. As a by-product, we also obtain a concise characterization of linear and orthogonal STBC's as well as the relationship between them. The MSE optimality of OSTBC shown herein can be used as a way of introducing this coding scheme in a formal manner.

关键词： Mean square error methods Block codes Receiving antennas GSM MIMO Frequency Transmitting antennas Signal to noise ratio control systems Signal processing

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Fuzzy clustering of short time-series and unevenly distributed sampling points

引用

5th International Symposium on Intelligent Data Analysis, IDA 2003

作者： Möller-Levet, Carla S. Klawonn, Frank Cho, Kwang-Hyun Wolkenhauer, Olaf Control Systems Centre Department of Electrical Engineering and Electronics UMIST Manchester United Kingdom Department of Computer Science University of Applied Sciences WolfenbüttelD-38302 Germany School of Electrical Engineering University of Ulsan Ulsan680-749 Korea Republic of Department of Computer Science University of Rostock Albert Einstein Str. 21 Rostock18051 Germany

ISBN: (纸本)3540408134

This paper proposes a new algorithm in the fuzzy-c-means family, which is designed to cluster time-series and is particularly suited for short time-series and those with unevenly spaced sampling points. Short time-series, which do not allow a conventional statistical model, and unevenly sampled time-series appear in many practical situations. The algorithm developed here is motivated by common experiments in molecular biology. Conventional clustering algorithms based on the Euclidean distance or the Pearson correlation coefficient are not able to include the temporal information in the distance metric. The temporal order of the data and the varying length of sampling intervals are important and should be considered in clustering time-series. The proposed short time-series (STS) distance is able to measure similarity of shapes which are formed by the relative change of amplitude and the corresponding temporal information. We develop a fuzzy time-series (FSTS) clustering algorithm by incorporating the STS distance into the standard fuzzy clustering scheme. An example is provided to demonstrate the performance of the proposed algorithm. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Fuzzy clustering

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Comparison between norm constrained and robust Capon beamformers

Comparison between norm constrained and robust Capon beamfor...

引用

IEEE International Symposium on Phased Array systems and Technology

作者： Zhisong Wang Jian Li P. Stoica Department of Electrical and Computer Engineering University of Florida Gainesville FL USA Department of Systems and Control University of Uppsala Uppsala Sweden

The standard Capon beamformer (SCB) is known to have better resolution and much better interference rejection capability than the standard data-independent beamformer when the array steering vector is accurately known. However, the major problem of SCB is that it lacks robustness in the presence of array steering vector errors. In this paper, we will first provide a complete analysis of a norm constrained Capon beamformer (NCCB), which uses a norm constraint on the weight vector to improve the robustness against array steering vector errors and noise. Our analysis is thorough and sheds more light on the choice of the norm constraint than what was commonly known. We also briefly discuss our recently proposed robust Capon beamformer (RCB), which is obtained via extending the covariance matrix fitting approach to the case of uncertain steering vectors. Our RCB is based on a clear theoretical background and explicitly addresses the steering vector uncertainty problems. Both NCCB and RCB can be efficiently computed at a comparable cost with that of SCB. Performance comparisons of NCCB and RCB via a number of numerical examples are also presented.

关键词： Sensor arrays Covariance matrix Uncertainty Noise robustness Interference constraints Vectors control systems Costs Adaptive arrays Power generation

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Doubly constrained robust Capon beamformer

Doubly constrained robust Capon beamformer

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Asilomar Conference on Signals, systems & computers

作者： J. Li P. Stoica Z. Wang Department of Electrical and Computer Engineering University of Florida Gainesville FL USA Department of Systems and Control University of Uppsala Uppsala Sweden

The standard Capon beamformer (SCB) is known to have better resolution and much better interference rejection capability than the standard data-independent beamformer when the array steering vector is accurately known. However, the major problem of SCB is that it lacks robustness in the presence of array steering vector errors. In this paper, we provide a natural extension of SCB, obtained via covariance matrix fitting, to the case of uncertain steering vectors by enforcing a double constraint on the array steering vector, viz. a constant norm constraint and a spherical uncertainty set constraint, which we refer to as the doubly constrained robust Capon beamformer (DCRCB). DCRCB can be efficiently computed at a comparable cost with that of SCB. Performance comparisons of DCRCB and our previously proposed robust Capon beamformer (RCB) are also presented via a number of numerical examples.

关键词： Robustness Uncertainty Sensor arrays Covariance matrix Interference Array signal processing Optical coupling Constraint optimization control systems Costs

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On robust Capon beamforming and diagonal loading

On robust Capon beamforming and diagonal loading

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Jian Li P. Stoica Zhisong Wang Department of Electrical and Computer Engineering University of Florida Gainesville FL USA Department of Systems and Control University of Uppsala Uppsala Sweden

Whenever the knowledge of the array steering vector is imprecise (as is often the case in practice), the performance of the Capon beamformer may become worse than that of the standard beamformer. Diagonal loading (including its extended versions) has been a popular approach to improve the robustness of the Capon beamformer. In this paper we show that a natural extension of the Capon beamformer to the case of uncertain steering vectors also belongs to the class of diagonal loading approaches but the amount of diagonal loading can be precisely calculated based on the uncertainty set of the steering vector. The proposed robust Capon beamformer can be efficiently computed at a comparable cost with that of the standard Capon beamformer. Its excellent performance is demonstrated via a number of numerical examples.

关键词： Robustness Array signal processing Uncertainty Sensor arrays Interference constraints Vectors control systems Costs Signal resolution Calibration

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Reuse of information as a base for development and verification of control programs for flexible manufacturing cells

Reuse of information as a base for development and verificat...

引用

IEEE International Workshop on Intelligent Robots and systems (IROS)

作者： J. Richardsson M. Fabian Control and Computer Systems Advanced Equipment Engineering Volvo Car Corporation Goteborg Sweden Control and Automation Laboratory Department of Signals and Systems Chalmers University of Technology Goteborg Sweden

Shortened product life-cycles decreases the output rate of manufacturing systems as the introduction of new products into the manufacturing system becomes more frequent. Improvements of the development process of manufacturing systems are needed to increase the output. Information handling and development of control programs based on information reuse are two of the most important improvement areas. These areas, among other things, can be a support for offline verification, which promises to directly increase the output rate due to shortening product introduction times. This paper deals with two problems of the many connected to enabling offline verification. First, a general control program structure, adapted to information reuse, is needed and secondly, the information necessary to generate the control programs needs to be defined. A method is proposed where information from the mechanical design of a cell, from the product, and from manual simulation are reused and automatically converted into control programs that schedule the work in a collision-free, deadlock-free and time-optimized way. The correctness of the generated programs is guaranteed by use of formal methods, simulation and an uncorrupted conversion of specifications into control programs.

关键词： Flexible manufacturing systems control systems Manufacturing systems computer aided manufacturing Automatic generation control Automatic control Manufacturing automation Production computer bugs systems engineering and theory

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Maximum likelihood double differential detection clarified

Maximum likelihood double differential detection clarified

引用

IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

作者： P. Stoica Jianhua Liu Jian Li Department of Systems and Control University of Uppsala Uppsala Sweden Department of Electrical and Computer Engineering University of Florida Gainesville FL USA

The maximum likelihood detector (MLD) for single differential modulation is easy to derive. On the other hand, the MLD problem associated with double differential modulation is much more complicated and solving it was deemed to require a computationally unattractive nonlinear search. Consequently a simple heuristical detector was usually preferred to the MLD, on computational grounds. In this paper we prove the somewhat unexpected result that the aforementioned heuristical detector coincides with the exact MLD.

关键词： Maximum likelihood detection Detectors Equations Frequency Transmitters control systems Baseband Gaussian noise Doppler shift Councils

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Optimal Tuning of PID controllers for First Order Plus Time Delay Models Using Dimensional Analysis

Optimal Tuning of PID Controllers for First Order Plus Time ...

引用

International Conference on control and Automation (ICCA)

作者： S. Tavakoli M. Tavakoli Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK Department of Electrical and Computer Engineering University of Western Ontario London ONT Canada

Using dimensional analysis and numerical optimisation techniques, an optimal method for tuning PID controllers for first order plus time delay systems is presented. Considering integral square error (ISE), integral absolute error (IAE) and integral time absolute error (ITAE) performance criteria, optimal equations for obtaining PID parameters are proposed. Simulation results show that the proposed method has a considerable superiority over conventional techniques. In addition, the closed loop system shows a robust performance in the face of model parameters uncertainty.

关键词： Three-term control Optimal control Delay effects Integral equations Optimization methods control systems Closed loop systems Robustness Uncertain systems

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Forcefree control with independent compensation for inertia friction and gravity of industrial articulated robot arm

Forcefree control with independent compensation for inertia ...

引用

IEEE International Conference on Robotics and Automation (ICRA)

作者： S. Goto N. Nakamura N. Kyura Department of Advanced Systems Control Engineering Saga University Honjomachi Saga Japan Department of Electcal and Computer Engineering Kinki University in Kyushu Iizuka Japan

Forcefree control can realize the flexible motion of industrial articulated robot arms without any change of the built-in controller. In this paper, the forcefree control was extended to realize flexible motion emulating operational circumstance free of inertia, friction and gravity through the independent compensation of inertia, friction and gravity. The property of the forcefree control with independent compensation was also investigated by experimental study of an actual industrial articulated robot arm, where the external force was measured with a force sensor which was attached to the tip of the robot arm.

关键词： Force control Friction Gravity Industrial control Service robots Motion control Defense industry Robot sensing systems Force measurement Force sensors

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