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检索条件"任意字段=Advanced Signal Processing Algorithms, Architectures, and Implementations 1990"

共 433 条记录，以下是301-310 订阅

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REAL-TIME RADAR signal-processing FOR AUTONOMOUS AIRCRAFT LANDING 4

REAL-TIME RADAR SIGNAL-PROCESSING FOR AUTONOMOUS AIRCRAFT LA...

引用

4TH CONF ON advanced signal processing algorithms, architectures, AND implementations

作者： SADJADI, F HELGESON, M RADKE, J STEIN, G Machine Intelligence Corp. (United States) Honeywell Inc. (United States)

ISBN: (纸本)0819412767

Landing in poor weather is a crucial problem for the air transportation system. To aid the pilots for these conditions several solutions have been suggested and/or implemented including instrument landing systems (ILS) and microwave landing systems (MLS) that put the responsibility of the landing to a large extent in the hands of the airport facilities. These systems even though useful are not available due to their high costs even in a few major metropolitan airports. This shortcoming has generated interest in providing all weather capabilities not on the landing facility but on the vehicle itself. The Synthetic Vision System Technology Demonstration sponsored by the United States Federal Aviation Administration (FAA) and the U.S. Air Force represents an effort to respond to the above needs. In this paper we present a summary of a typical synthetic vision system. This system consists of a scanning 35 GHz radar, a scanning antenna, a signal/image processor and a head up display (HUD). The pilot is presented a final perspective image of the scene sensed by the radar with associated flight guidance symbology. This system is implemented in real time hardware and has been undergoing tower and flight testing under a variety of weather conditions since early 1992.

关键词： Radar signal processing Antennas Heads up displays Video Digital signal processing Process control Radar signal processing Image enhancement Imaging systems

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APPLICATIONS OF TIME-FREQUENCY AND TIME-SCALE TRANSFORMS TO ULTRA-WIDE-BAND RADAR TRANSIENT signal-DETECTION 4

APPLICATIONS OF TIME-FREQUENCY AND TIME-SCALE TRANSFORMS TO ...

引用

4TH CONF ON advanced signal processing algorithms, architectures, AND implementations

作者： FARGUES, MP BROOKS, WA Naval Postgraduate School (United States)

ISBN: (纸本)0819412767

In this paper we use a non-stationary approach and analyze ultra-wideband (UWB) radar data using time-frequency and time-scale transformations. The time-frequency transformations considered are the Short-Time Fourier Transform (STFT), the Wigner-Ville Distribution (WD), the Instantaneous Power Spectrum (IPS), and the ZAM transform. Two discrete implementations of the Wavelet Transform (DWT) are also investigated: the decimated A- trous algorithm proposed by Holschneider et al, which uses non-orthogonal wavelets; and the Mallat algorithm, which employs orthogonal wavelets. The transients under study are UWB radar returns from a boat (with and without corner reflector) in the presence of sea clutter, multipath, and radio frequency interferences (RFI). Results show that all time-frequency and time-scale transforms clearly detect the transient radar returns corresponding to the boat with a corner reflector. However, as the radar cross section of the target decreases (boat without a corner reflector), results change drastically as the RFI component dominates the signal. Simulations show that the Instantaneous Power Spectrum may be better adapted for localizing the transient among the time-frequency techniques studied. The decimated A-trous algorithm has the best time resolution of the techniques studied as the return appears better localized in the scalogram.

关键词： Time-frequency analysis Transform theory Radar Wavelets Reflectors Electromagnetic coupling UWB radar Discrete wavelet transforms Digital filtering signal detection

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ADAPTIVE ANTENNA BEAMFORMING USING ORTHOGONAL DECOMPOSITION 4

ADAPTIVE ANTENNA BEAMFORMING USING ORTHOGONAL DECOMPOSITION

引用

4TH CONF ON advanced signal processing algorithms, architectures, AND implementations

作者： YU, KB GE Corporate Research and Development Ctr. (United States)

ISBN: (纸本)0819412767

An algorithm has been developed to control the antenna array beam pattern for multiple beam antenna (MBA) or phased array systems. The algorithm is motivated by military satellite communications applications where the uplink received antenna is desired to provide beamforming capability for selective earth coverage and jamming protection. The problem can be formulated as to determine the control weight to meet the user gain and jammer null requirements in their known directions subject to the norm constraint of the weight defined by the power conservation law. The algorithm makes use of an orthogonal decomposition of the weight vector into the constraint weight vector and the zero-output weight vector. If the constraint weight vector satisfies the norm bound constraint, the zero-output vector can further be optimized to minimize the deviation of the resulting weight from the quiescent weight. If the constraint weight vector does not satisfy the norm bound constraint, a recursive procedure has been developed which provides flexibility in the determination of the constraint vectors, the constraint order and the constraint phase optimization. This algorithm provides a practical means to achieve the constraints subject to the norm bound condition.

关键词： Antennas Algorithm development Phased arrays Control systems Nulling interferometry Satellite communications Telecommunications Data processing Mobile communications Receivers

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PIPELINED IMPLEMENTATION OF HIGH-SPEED STAR-RLS ADAPTIVE FILTERS 4

PIPELINED IMPLEMENTATION OF HIGH-SPEED STAR-RLS ADAPTIVE FIL...

引用

4TH CONF ON advanced signal processing algorithms, architectures, AND implementations

作者： RAGHUNATH, KJ PARHI, KK Univ. of Minnesota/Twin Cities (United States)

ISBN: (纸本)0819412767

The popular QR decomposition based recursive least-squares (RLS) adaptive filtering algorithm (referred to as QRD-RLS) has a limited speed of operation depending on the processing time of each individual cell. A new scaled tangent rotation based STAR-RLS algorithm has been designed which is suitable for fine-grain pipelining and also has a lower complexity. The inter-cell communication is also reduced by about half. A direct application of look-ahead to STAR-RLS can still lead to some increase in hardware. In this paper look- ahead is applied using delayed update operations such that the complexity is reduced while maintaining a fast convergence. The pipelined STAR-RLS (or PSTAR-RLS) algorithm requires the same number of operations (multiplications or divisions) as the serial STAR-RLS algorithm. Practical issues related to the STAR-RLS algorithm such as numerical stability and dynamic range are also examined.

关键词： Digital filtering Algorithm development Error analysis Stars Tantalum Very large scale integration Data modeling Image processing Numerical stability Thulium

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EVOLUTIONARY SPECTRAL ESTIMATION BASED ON ADAPTIVE USE OF WEIGHTED NORMS 4

EVOLUTIONARY SPECTRAL ESTIMATION BASED ON ADAPTIVE USE OF WE...

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4TH CONF ON advanced signal processing algorithms, architectures, AND implementations

作者： CABRERA, SD FLORES, BC THOMAS, G VEGAPINEDA, J Univ. of Texas/El Paso (United States)

ISBN: (纸本)0819412767

In this paper, an evolutionary spectral estimator based on the application of Adaptive Weighted Norm Extrapolation (AWNE) is formulated and illustrated for analysis of nonstationary signals. The AWNE method produces a stationary extension of the data so that computing its Fourier transform yields a nonparametric, high-resolution spectrum estimate. The evolutionary formulation described here uses a time slice of the time-averaged Spectrogram to select the initial weight function (prior spectrum) used in AWNE for each block of data. This function strongly influences the final shape of the resulting spectrum. The resulting Short-Time AWNE (STAWNE) time-frequency representation yields improved frequency-domain resolution, preserves components which last longer than one time block, and is devoid of cross-terms. Comparison with short-time autoregressive spectral estimation yields improved consistency in the spectral energy levels as time varies. Finally, this sequential spectrum estimator is also illustrated for use in range-Doppler imaging of reflectivity surfaces having prominent scatterers by hybrid two-dimensional spectral estimation in-tandem with the discrete Fourier transform.

关键词： Autoregressive models Fourier transforms Time-frequency analysis Stars Data modeling Statistical analysis Yield improvement Electroluminescence Reflectivity signal analyzers

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Heterogeneous algorithms for image understanding architecture

Heterogeneous algorithms for image understanding architectur...

引用

1993 Computer architectures for Machine Perception, CAMP 1993

作者： Eshaghian, Mary M. Nash, J. Greg Shaaban, Muhammad E. Shu, David B. Department of Computer and Information Science New Jersey Institute of Technology NewarkNJ United States Centar Los AngelesCA United States Department of Electrical Engineering-Systems University of Southern California Los AngelesCA United States Hughes Research Laboratories MalibuCA United States

ISBN: (纸本)0818654201

The authors present a set of heterogeneous algorithms for computer vision tasks using the image understanding architecture (IUA). The full-scale IUA developed jointly by Hughes Research Labs and University of Massachusetts at Amherst is a multiple level heterogeneous architecture. Each level is constructed to perform tasks most suitable to its mode of processing. The lowest level called CAAPP is an SIMD bit-serial mesh. The second level is an MIMD organization of numerically powerful digital signal processing chips. At the top level there are fewer number of MIMD general purpose processors. The authors propose a set of algorithms utilizing multiple levels of this organization, concurrently. The problems studied include Hugh transform-line detection, finding geometric properties of images, and high level image understanding tasks such as object matching. © 1993 IEEE.

关键词： Digital signal processing

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advanced signal processing algorithms, architectures, and implementations III

Advanced Signal Processing Algorithms, Architectures, and Im...

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advanced signal processing algorithms, architectures, and implementations III

ISBN: (纸本)081940943X

This conference proceedings contains 39 papers. The topics discussed are algorithmic engineering, algorithm implementations, parallel processing systems, pipeline processing systems, signal processing architectures, array processing and direction finding, time frequency signal analysis, higher-order spectra, signal theory, wavelets, and time-frequency distributions.

关键词： Digital signal processing

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advanced signal processing algorithms, architectures, and implementations Two

Advanced Signal Processing Algorithms, Architectures, and Im...

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1992年

作者： Franklin T Luk

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VLSI implementations OF NUMBER THEORETIC CONCEPTS WITH APPLICATIONS IN signal-processing

VLSI IMPLEMENTATIONS OF NUMBER THEORETIC CONCEPTS WITH APPLI...

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CONF ON advanced signal processing algorithms, architectures, AND implementations 3

作者： WIGLEY, NM JULLIEN, GA Univ. of Windsor (Canada)

ISBN: (纸本)081940943X

This paper explores novel techniques involving number theoretic concepts to perform real-time digital signal processing for high bandwidth data stream applications in digital signal processing. Often the arithmetic manipulations are simple in form (cascades of additions and multiplications in a well defined structure) but the numbers of operations that have to be computed every second can be large. This paper discusses ways in which new number theoretic mapping techniques can be used to perform DSP operations by both reducing the amount of hardware involved in the circuitry and by allowing the construction of very benign architectures down to the individual cells. Such architectures can be used in aggressive VLSI/ULSI implementations. We restrict ourselves to the computation of linear filter and transform algorithms, with the inner product form, which probably account for the vast majority of digital signal processing functions implemented commercially.

关键词： Digital signal processing Switching Radon Binary data Transistors Logic Very large scale integration Clocks CRTs signal processing

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NETWORKS FOR MODELING AND signal-processing

NETWORKS FOR MODELING AND SIGNAL-PROCESSING

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CONF ON advanced signal processing algorithms, architectures, AND implementations 3

作者： YOU, YL XU, WY GORYN, D KAVEH, M Univ. of Minnesota (United States) Siemens AG (Germany)

ISBN: (纸本)081940943X

This paper presents modifications of the continuous Hopfield and Hartline-Ratliff networks for use in signal restoration and parameter estimation. The particular parameter estimation problem of interest is concerned with the estimation of the directions of arrival of an unknown number of plane waves in unknown noise. Restoration of linearly distorted noisy images is considered as an example of regularized restoration of a signal with known dynamic range.

关键词： Neurons signal to noise ratio Neural networks Image restoration signal processing Sensors Binary data Computer programming Control systems Phased arrays

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