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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： T. Ogunfunmi Nam Ling Signal and Image Processing Laboratory (SIPL) Department of Electrical Engineering Santa Clara University Santa Clara CA USA Computer Systems and Parallel Processing Research Laboratory (CSPPRL) Department of Computer Engineering Santa Clara University Santa Clara CA USA

For real-time radar processing, it is very desirable to have an algorithm that does not assume restricted statistics of the input data and can be implemented for high-speed processing (without a high cost) to meet real-time requirements. We therefore apply the QR decomposition-based least-squares method for linear prediction to the problem of computing the reflection coefficients of a lattice predictor, instead of using the conventional Burg algorithm. We also propose a modified one-dimensional ring architecture for implementing the QR method of least-squares. The particular application considered in this case is that of surveillance radar systems for air traffic control.< >

关键词： Least squares methods Air traffic control Radar applications Signal processing algorithms Radar signal processing Statistics Systolic arrays Radar imaging Signal processing Surveillance

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Local estimation of Gaussian-based edge enhancement filters using Fourier analysis

Local estimation of Gaussian-based edge enhancement filters ...

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1993 IEEE International Conference on Acoustics, Speech, and Signal processing

作者： B. Wang D.M. Rose A.A. Farag E.J. Delp Engineering Mathematics & Computer Science Department Speed Scientific School University of Louisville Louisville KY USA Computer Vision & Image Processing Laboratory School of Electrical Engineering Purdue University West Lafayette IN USA

An empirical measure for the selection of the edge-enhancement Gaussian filter is developed. The Gaussian filter is specified by its standard deviation sigma ; the filter's spatial support is a function of sigma . An estimation procedure for sigma using Fourier analysis is described. The measure is easy to implement and is based totally on the image at hand. Experimental results suggest that this measure can be used as an aid in deciding the Gaussian filter's spatial support, which is needed to enhance the edges. Other equivalent bandwidth definitions can be used to obtain a measure of the frequency spread in the smoothed image (e.g., the mean-square bandwidth).< >

关键词： Gaussian processes Low pass filters Shape Filtering Frequency Mathematics computer science computer vision image processing image segmentation

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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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Further studies on frozen-time eigenvalues in the stability analysis for periodic linear systems 24

Further studies on frozen-time eigenvalues in the stability ...

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24th Southeastern Symposium on System Theory and 3rd Annual Symposium on Communications, Signal processing Expert Systems, and ASIC VLSI Design, SSST/CSA 1992

作者： Zhu, J. Ray, S. Vemula, S.K. Electrical and Computer Engineering Department Louisiana State University Baton RougeLA70803 United States Remote Sensing and Image Processing Laboratory Louisiana State University Baton RougeLA70803 United States

ISBN: (纸本)0818626658

In this paper we present some enlightening results to show why and how stability assessment for Linear Time-Varying (LTV) systems based solely on the location of the "frozen-time eigenvalues (FTE)" fails to be sufficient or necessary, using two classes of parametrized periodic LTV systems derived from two examples given by Markus-Yamabe [6] and Wu [11]. Exact domain of stability in the parameter space obtained using analytical or numerical solutions of the Floquet characteristic Exponents are presented, and compared to that predicted by FTEs. The results are useful in the study of robustness and stabilization of Linear Time Invariant (LTI) systems, as will be shown in this paper that an unstable LTI system maybe stabilized or destabilized by periodic structural perturbations (pumping) without any control input. © 1992 IEEE.

关键词： System stability

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Animated simulation of control systems on personal computers 24

Animated simulation of control systems on personal computers

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24th Southeastern Symposium on System Theory and 3rd Annual Symposium on Communications, Signal processing Expert Systems, and ASIC VLSI Design, SSST/CSA 1992

作者： Zhu, J. Zhang, X. Electrical and Computer Engineering Department Louisiana State University Baton RougeLA70803 United States Remote Sensing and Image Processing Laboratory Louisiana State University Baton RougeLA70803 United States

ISBN: (纸本)0818626658

In this paper we apply computer visualization techniques such as computer (3D) graphics, animation, and photorealistic color rendering to the simulation of dynamical processes and control systems in limited-resource environment such as personal computers (PC) and workstations. A prototype 3D photorealistic animated simulation package AniSim for PC will be presented to demonstrate the feasibility and usefulness of animated simulation techniques for teaching and research purposes. © 1992 IEEE.

关键词： Personal computers

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Calibration of a κ-band autocorrelation radiometer 12

Calibration of a κ-band autocorrelation radiometer

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12th Annual International Geoscience and remote sensing Symposium, IGARSS 1992

作者： Gaiser, Peter W. Boncyk, Wayne C. Swift, Calvin T. Microwave Remote Sensing Laboratory Department of Electrical and Computer Engineering University of Massachusetts at Amherst AmherstMA01002 United States

The following paper describes a κ-Band Autocorrelation Radiometer called CORRAD. The purpose of CORRAD is to measure tropospheric water vapor. A description of the hardware is included. The calibration technique is d... 详细信息

ISBN: (纸本)0780301382

关键词： Radiometers

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POLARIMETRIC SIGNATURES OF A CANOPY OF DIELECTRIC CYLINDERS BASED ON 1ST AND 2ND-ORDER VECTOR RADIATIVE-TRANSFER THEORY

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JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS 1992年第1期6卷 19-51页

作者： TSANG, L CHAN, CH KONG, JA JOSEPH, J Electromagnetics and Remote Sensing Laboratory Department of Electrical Engineering University of Washington Seattle WA 98195 United States Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA 02139 United States General Electric Corporate Research and Development Schenectady NY 12301 United States

Complete polarimetric signatures of a canopy of dielectric cylinders overlying a homogeneous half space are studied with the first and second order solutions of the vector radiative transfer theory. The vector radiative transfer equations contain a general nondiagonal extinction matrix and a phase matrix. The energy conservation issue is addressed by calculating the elements of the extinction matrix and the elements of the phase matrix in a manner that is consistent with energy conservation. Two methods are used. In the first method, the surface fields and the internal fields of the dielectric cylinder are calculated by using the fields of an infinite cylinder. The phase matrix is calculated and the extinction matrix is calculated by summing the absorption and scattering to ensure energy conservation. In the second method, the method of moments is used to calculate the elements of the extinction and phase matrices. The Mueller matrix based on the first order and second order multiple scattering solutions of the vector radiative transfer equation are calculated. Results from the two methods are compared. The vector radiative transfer equations, combined with the solution based on method of moments, obey both energy conservation and reciprocity. The polarimetric signatures, copolarized and depolarized return, degree of polarization, and phase differences are studied as a function of the orientation, sizes, and dielectric properties of the cylinders. It is shown that second order scattering is generally important for vegetation canopy at C band and can be important at L band for some cases.

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C-BAND MEASUREMENT OF RADAR BACKSCATTER FROM THE OCEAN SURFACE DURING SWADE 12

C-BAND MEASUREMENT OF RADAR BACKSCATTER FROM THE OCEAN SURFA...

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12TH ANNUAL INTERNATIONAL SYMP ON GEOSCIENCE AND remote sensing ( IGARSS 92 )

作者： CARSON, SC MCINTOSH, RE PAYLOR, AW LI, F NEUMANN, G MCLAUGHLIN, DJ Microwave Remote Sensing Laboratory Department of Electrical and Computer Engineering University of Massachusetts Amherst 01003 MA United States Jet Propulsion Laboratory 4800 Oak Grove Drive Pasadena 91103 CA United States Electrical and Computer Engineering Dept. Northeastern University Boston 02115 MA United States

ISBN: (纸本)0780301382

A preliminary analysis of backscatter measurements collected during the joint NASA/ONR Surface Wave Dynamics Experiment (SWADE) by a C-Band scatterometer (C-SCAT) developed at the University of Massachusetts [l] is presented. Data was collected during a total of 10 flights on board the NASA/Ames C-130B from February 27, 1991 to March 9, 1991 off the coast of Virginia. These backscatter measurements are vertically polarized, and were obtained over a full 360 degrees in azimuth, at incidence angles ranging from 20 to 50 degrees.

关键词： Azimuth Backscatter Geophysical measurements Laboratories NASA Ocean temperature Radar measurements Sea measurements Sea surface Stability

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Real-time pattern recognition by joint-Fourier transform correlation

Real-time pattern recognition by joint-Fourier transform cor...

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International Conference on Manufacturing Automation 1992

作者： Poon, Ting-Chung Pieper, Ronald J. Optical Image Processing Laboratory Bradley Department of Electrical Engineering Virginia Polytechnic Institute State University BlacksburgVA24061 United States Department of Electrical and Computer Engineering Naval Postgraduate School MontereyCA93943 United States

Two commonly used optical correlation techniques, matched spatial filtering and joint-Fourier transform correlation, are briefly reviewed. A recently proposed real-time joint-Fourier transform correlation is then disc... 详细信息

关键词： Fourier transforms

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Further Studies on Frozen-Time Eigenvalues in the Stability Analysis for Periodic Linear Systems

Further Studies on Frozen-Time Eigenvalues in the Stability ...

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Southeastern Symposium on System Theory

作者： J. Zhu S. Ray S.K. Vemula Remote Sensing and Image Processing Laboratory Louisiana State University Baton Rouge LA USA Electrical and Computer Engineering Department Louisiana State University Baton Rouge LA USA

关键词： Eigenvalues and eigenfunctions Stability analysis Linear systems Stability criteria Upper bound Robust stability remote sensing image processing Laboratories Robust control

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