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American control Conference (ACC)

作者： M. Elta H. Etemad J. S. Freudenberg M. D. Giles J. W. Grizzle P. T. Kabamba P. P. Khargonekar S. Lafortune S. M. Meerkov J. R. Moyne B. A. Rashap D. Teneketzis F. L. Terry Solid State Electronics Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA Control Systems Laboratory and Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

This paper describes the development of real-time control technology for the improvement of manufacturing characteristics of reactive ion etchers. A general control strategy is presented as well as supporting experime... 详细信息

关键词： Semiconductor device manufacture Etching Plasma applications Laboratories Pulp manufacturing Manufacturing processes Plasma materials processing Feedback control control systems Production facilities

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Target Detection and Localization from Bearing-Only and Bearing/range Measurements

Target Detection and Localization from Bearing-Only and Bear...

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IEEE Regional Conference on Aerospace control systems

作者： L.G. Weiss S.C.A. Thomopoulos Applied Research Laboratory Pennsylvania State University PA USA Decision and Control Systems Laboratory Department of Electrical and Computer Engineering Pennsylvania State University PA USA

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High Resolution Target Range Estimation in the Presence of Multipath Using JDEF

High Resolution Target Range Estimation in the Presence of M...

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IEEE Regional Conference on Aerospace control systems

作者： M.D. Reger S.C.A. Thomopoulos Applied Research Laboratory Pennsylvania State University University Park PA USA Decision and Control Systems Laboratory Department of Electrical and Computer Engineering Pennsylvania State University University Park PA USA

The Joint Detection/Estimation Filter (JDEF) [1,2] can be utilized to improve the performance of a single Extended Kalmart Filter (EKF) when the problem of estimation involves a large initial variance. In this case the JDEF is used to estimate the presence and location of a point target when the received signal is corrupted by multipath. In the formulation of the problem it was assumed that both the target and sensor were stationary and that there was an equal probability of the point target being present or absent along a center look direction. This implementation of the JDEF proved to be quite successful and can be easily expanded to estimate a larger number of unknown parameters.

关键词： Filters State estimation Laboratories Delay estimation Underwater tracking Mean square error methods control systems Sensor phenomena and characterization Sensor systems Gaussian noise

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High Resolution Multi-Radar Data Fusion Using JDEF

High Resolution Multi-Radar Data Fusion Using JDEF

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IEEE Regional Conference on Aerospace control systems

作者： T.W. Hilands S.C.A. Thomopoulos Applied Research Laboratory Pennsylvania State University University Park PA USA Decision Control Systems Laboratory Department of Electrical and Computer Engineering Pennsylvania State University University Park PA USA

This paper addresses the problem of multi sensor detection and high resolution signal parameter estimation using joint maximum a posteriori detection and high order nonlinear filtering techniques. The model-based fusion approach offers the potential for increased target resolution in range/azimuth space. The technique employs joint detection/estimation filters (JDEF) for target detection and parameter localization. The JDEF approach segments the aggregate nonlinear model over the entire target resolution space into subcells. This partitioning leads to extremely accurtate detection and parameter estimation. The proposed JDEF approach has a built-in capability for automatic data alignment from multiple sensors, and can be used for centralized, noncentralized, and distributed data fusion.

关键词： Sensor arrays Sensor fusion Radar tracking Phased arrays Delay estimation Phase estimation Delay effects Sea measurements Laboratories Signal resolution

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High Order Filters for Estimation in Non-Gaussian Noise

High Order Filters for Estimation in Non-Gaussian Noise

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American control Conference (ACC)

作者： Stelios C. A. Thomopoulos Thomas W. Hilands Decision and Control Systems Laboratory Department of Electrical and Computer Engineering Pennsylvania State University University Park PA USA Applied Research Laboratory Pennsylvania State University University Park PA USA

In this paper high order vector filter equations are developed for estimation in non-Gaussian noise. The difference between the filters developed here and the standard Kalman filter is that the filter equation contains nonlinear functions of the innovations process. These filters are general in that the initial state covariance, the measurement noise covariance, and the process noise covariance can all have non-Gaussian distributions. Two filter structures are developed. The first filter is designed for systems with asymmetric probability densities. The second is designed for systems with symmetric probability densities. Experimental evaluation of these filters for estimation in non-Gaussian noise, formed from Gaussian sum distributions, shows that these filters perform much better than the standard Kalman filter, and close to the optimal Bayesian estimator.

关键词： Filters Bayesian methods Noise measurement State estimation Laboratories Nonlinear equations Technological innovation Vectors control systems Standards development

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Nonlinear Adaptive Joint Detection/Estimation for Multi-Radar Data Fusion

Nonlinear Adaptive Joint Detection/Estimation for Multi-Rada...

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American control Conference (ACC)

作者： Thomas W. Hilands Stelios C. A. Thomopoulos Applied Research Laboratory Pennsylvania State University University Park PA USA Decision and Control Systems Laboratory Department of Electrical and Computer Engineering Pennsylvania State University University Park PA USA

This paper addresses the problem of multisensor detection and high resolution signal parameter estimation using joint maximum a posteriori detection and high order nonlinear filtering techniques. The model-based fusion approach offers the potential for increased target resolution in range/azimuth space. The technique employs joint detection/estimation (JDE) filters for target detection and target parameter localization. The JDE approach segments the aggregate nonlinear model over the entire target resolution space into resolution subcells. This partitioning leads to extremely accurtate detection and parameter estimation. The proposed JDE approach has a built-in capability for automatic data alignment from multiple sensors, and can be used for centralized, noncentralized, and distributed data fusion.

关键词： Sensor arrays Parameter estimation Phased arrays State estimation Sensor fusion Radar tracking Clutter Delay effects Sea measurements Signal resolution

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High Resolution Model Order Selection and Parameter Estimation Using JDEF (Joint Detection/Estimation Filter)

High Resolution Model Order Selection and Parameter Estimati...

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IEEE Regional Conference on Aerospace control systems

作者： S.C.A. Thomopoulos K. Ramaswamy G. Rajagopal T.W. Hilands Decision & Control Systems Laboratory Department of Electrical & Computer Engineering Pennsylvania State University University Park PA USA Applied Research Laboratory Pennsylvania State University University Park PA USA

The problem of model order selection in the presence of parametric uncertainty is considered. A high resolution joint detection/estimation filter is used to detect the correct order of the model and estimate the signa... 详细信息

关键词： Parameter estimation Radar detection Acoustic signal detection Filters Additive noise Predictive models Laboratories Mathematical model State estimation Higher order statistics

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Prediction and comparisons of C-band reflectivity profiles from S-band dual polarization measurements

Prediction and comparisons of C-band reflectivity profiles f...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： H. Direskeneli T.A. Seliga K. Aydin Information and Control Systems Inc. Hampton VA USA Electromagnetics and Remote Sensing Laboratory Department of Electrical Engineering University of Washington Seattle WA USA Communications and Space Scienceences Laboratory Department of Electrical and Computer Engineering Pennslyvania State University University Park PA USA

Apparent reflectivity factors measured by a radar operating at an attenuating wavelength can be adequately predicted by using the reflectivity factors at horizontal and vertical polarizations measured at a non-attenuating wavelength. This capability is important for understanding effects of rainfall on both microwave communication systems and the operation of weather radars operating at attenuating wavelengths. This paper examines and tests this capability by using S-band dual polarization radar measurements to predict C-band radar reflectivity measurements of the same storm but from a different location. The predictions of C-band observations were obtained from disdrometer-derived relationships between S-band reflectivity factor Z/sub H/(10 cm) and differential reflectivity Z/sub DR/ measurements and C-band reflectivity factor Z/sub H/(5 cm) and specific attenuation A/sub H/. Apparent reflectivity factor measurements at C-band, derived from S-band measurements, compared very well with actual measurements in the same storm. The results support the use of the dual polarization radar technique for predicting scattering and attenuation effects of narrow beam microwave signals propagating through rain-filled media along paths other than that traversed by the radar.< >

关键词： Reflectivity Attenuation measurement Wavelength measurement Radar measurements Polarization Radar scattering Storms Microwave communication Meteorological radar Testing

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Worst Case Identification of Continuous time systems via Interpolation

Worst Case Identification of Continuous time Systems via Int...

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American control Conference (ACC)

作者： Jie Chen Guoxiang Gu Carl N. Nett Schools of AeroSpace and Electrical Engineering Georgia Institute of Technology Atlanta GA USA Department of Electrical and Computer Engineering Louisiana State University Baton Rouge LA USA Laboratory for Identification and Control of Complex Highly Uncertain Systems(LIC-CHUS) School of Aerosapce Engineering Georgia Institute of Technology Atlanta GA USA

We consider a worse case control oriented identification problem recently studied by several authors. This problem is one of the H∞ identification in the continuous time setting. We give a less conservative formulation of this problem. The available apriori information consists of a lower bound on the relative stability of the plant, a frequency dependent upper bound on a certain gain associated with the plant, and an upper bound on the noise level. The available experimental information consists of a finite number of noisy plant point frequency response samples. The objective is to identify from the given apriori and experimental information an uncertain model that includes a stable nominal plant model and a bound on the modeling error measured in H∞ norm. Our main contributions include both a new identification algorithm and several new explicit lower and upper bounds on the identification error. The algorithm proposed belongs to the class of interpolatory algorithms which are known to possess a desirable optimality property under a certain criterion. The error bounds presented improve upon the previously available ones in both the aspects of providing a more accurate estimate of the identification error as well as establishing a faster convergence rate for the proposed algorithm.

关键词： Continuous time systems Interpolation Upper bound control systems Frequency Convergence Sampling methods Stability Noise level System identification

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DISTRIBUTED DETECTION WITH CONSULTING SENSORS AND COMMUNICATION COST

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IEEE TRANSACTIONS ON AUTOMATIC control 1992年第9期37卷 1398-1405页

作者： THOMOPOULOS, SCA OKELLO, NN Department of Electrical and Computer Engineering Decision and Control Systems Laboratory Pennslyvania State University University Park PA USA

The problem of distributed detection with consulting sensors in the presence of communication cost associated with any exchange of information (consultation) between sensors is considered. We consider a system of two sensors, S1 and S2, in which S1 is the primary sensor responsible for the final decision u0, while S2 is a consulting sensor capable of relaying its decision u2 to S1 when requested by S1. In the scenario that is considered, the final decision u0 is based either on the raw data available to S1 only, or it may, under certain request conditions, also take into account the decision u2 of sensor S2. Random and nonrandom request schemes are analyzed and numerical results are presented and compared for Gaussian and slow-fading Rayleigh channels. For each decision making scheme, an associated optimization problem is formulated whose solution is shown to satisfy certain a priori set design criteria that we consider essential for sensor fusion.

关键词： Costs Sensor fusion control systems Sensor systems Frequency Communication system control Servomechanisms Steady-state Polynomials Error correction

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