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检索条件"任意字段=Sensor Array and Multichannel Signal Processing Workshop"

共 2593 条记录，以下是331-340 订阅

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Numerically-robust adaptive subspace tracking using householder transformations

Numerically-robust adaptive subspace tracking using househol...

引用

1st IEEE sensor array and multichannel signal processing workshop (SAM 2000)

作者： Douglas, SC So Methodist Univ Dept Elect Engn Dallas TX 75275 USA

ISBN: (纸本)0780363396

In this paper, we develop simple principal and minor subspace tracking algorithms that exactly maintain the orthonormality of the subspace matrix estimate over time. Each of these algorithms use m identical Householder transformations to update the rows of the subspace matrix estimate at each time instant. Unlike many other approaches, ours have asymptotic complexities that scale linearly with the number of adaptive coefficients. We show that existing gradient-based and projection approximation subspace tracking (PAST) methods are first-order approximate versions of our proposed methods, and we also derive several more-accurate approximations. Simulations verify the excellent numerical behaviors of the proposed methods in subspace tracking tasks.

关键词： Algorithm design and analysis Approximation algorithms array signal processing Data mining Data visualization Pattern recognition signal processing

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CRB analysis of the impact of unknown receiver noise on phased array calibration

CRB analysis of the impact of unknown receiver noise on phas...

引用

4th IEEE sensor array and multichannel signal processing workshop

作者： van der Tol, Sebastiaan Wijnholds, Stefan J. Delft Univ Technol Dept Elect Engn DIMES Mekelweg 4 NL-2628 CD Delft Netherlands ASTRON R&D Dept NL-7991 PD Dwingeloo Netherlands

ISBN: (纸本)1424403081

In radio astronomy images are made of astronomical objects as they appear at radio frequencies using a technique called aperture synthesis. Signats from several antennas are correlated and integrated over time. The data collected over several hours are further processed to calibrate the instrument and to form an image or intensity map. The calibration and imaging algorithms do not use the autocorrelations because the receiver noise is unstable and hence considered unknown. In literature the Cramer Rao Bound for the calibration problem has been derived assuming that the autocorrelations are part of the available data. If the assumption is correct that the autocorrelations do not contain useful information when the receiver noise is unknown, than the CRB for the case that the autocorrelations are not part of the data will be the same. In this paper we will derive the CRB excluding the autocorrelations and show that it indeed does not matter whether the autocorrelations are included or not.

关键词： Spurious signal noise

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Nonlinear Parameter Estimation in Statistical Manifolds

Nonlinear Parameter Estimation in Statistical Manifolds

引用

8th IEEE sensor array and multichannel signal processing workshop (SAM)

作者： Wang, Xuezhi Cheng, Yongqiang Moran, Bill Univ Melbourne Melbourne Sch Engn Dept Elect & Elect Engn Melbourne Vic 3010 Australia Natl Univ Def Technol Sch Elect Sci & Engn Beijing Peoples R China Univ Melbourne Melbourne Sch Engn Def Sci Inst Melbourne Vic 3010 Australia

ISBN: (纸本)9781479914814

Many nonlinear parameter estimation problems can be described by the class of curved exponential families. The latter are fundamental concept in the framework of Information Geometry. This paper shows that when a closed-form statistical model is available the problem can be mapped onto the corresponding statistical manifolds via fixed parameterizations and thus solved optimally through a manifold gradient method. The solution process involves a dual projection which iteratively operates under the e-connection and m-connection in the flat manifolds with the coordinate systems in which the Cramer Rao Bound is attained. An example of tracking a moving target by two bearings-only sensors with location uncertainties is presented to demonstrate the efficiency and optimality of this manifold based method as well as the associated geometrical interpretation.

关键词： Parameter estimation Manifolds Coordinate system Information geometry SOLUTION processing statistical models (nuclear) optimality nonlinearity

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A comparsion of two non-homogeneity detection methods for space-time adaptive processing

A comparsion of two non-homogeneity detection methods for sp...

引用

2nd IEEE sensor array and multichannel signal processing workshop

作者： Rangaswamy, M Chen, P Michels, JH Himed, B USAF Res Lab SNHE Hanscom AFB MA 01731 USA

ISBN: (纸本)0780375513

This paper undertakes a comparison of two nonhomogeneity detection (NHD) methods and addresses their impact on the performance of the adaptive matched filter (AMF) method and the normalized adaptive matched filter (NAMF) method in severely non-homogeneous clutter scenarios. Performance analysis is carried out using simulated data as well as measured data from the MCARM Program. Specific consideration is given to the computational cost of the NHD method and the sample support requirements. This paper presents a technique for speeding up the computations in the NHD. Performance is reported in terms of the probability of detection versus signal-to-noise-ratio (SNR) for simulated data analyses.

关键词： signal to noise ratio

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Cellular and PCS propagation measurements and statistical models for urban multipath on an antenna array

Cellular and PCS propagation measurements and statistical mo...

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1st IEEE sensor array and multichannel signal processing workshop (SAM 2000)

作者： Keller, CM Bliss, DW MIT Lincoln Lab Lexington MA 02173 USA

ISBN: (纸本)0780363396

Multipath propagation has a significant impact on the performance of cellular and Personal Communication Services (PCS) systems in urban environments. This paper contains analyses to better understand urban multipath and examines the use of base-station antenna arrays to obtain spatial diversity. The results are based on data collected on large sparse aperture arrays and finely sampled arrays at a location below surrounding rooftop heights for both PCS and cellular frequencies. A statistical model is formulated to explain the relationship between multipath scatterers and signal cross-correlations as a function of antenna spacing.

关键词： Adaptive arrays Antenna arrays Antenna measurements Antennas and propagation Aperture antennas Broadband antennas Decorrelation Personal communication networks Receiving antennas Scattering

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Spatial characterization of indoor radio channel measurements at 5 GHz

Spatial characterization of indoor radio channel measurement...

引用

1st IEEE sensor array and multichannel signal processing workshop (SAM 2000)

作者： Stridh, R Ottersten, B Royal Inst Technol Dept Signals Sensors & Syst S-10044 Stockholm Sweden

ISBN: (纸本)0780363396

Multiple transmitters and receivers can be used to provide high link capacity in future wireless systems. Herein analysis of real indoor environment Multiple-Input-Multiple-Output measurements on the 5.8 GHz band is performed. The possible increase in capacity, utilizing multiple transmit and receive elements is examined. The gain possible when using channel knowledge at both transmitter and receiver is shown and the capacity dependence on the intra-element distance is examined for the experimental system and compared to simulations.

关键词： Handheld computers Indoor radio communication MIMO Radio transmitters Receivers Receiving antennas sensor phenomena and characterization sensor systems Transmitting antennas Wireless LAN

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Tracking of Multiple Sources in an Acoustic sensor Network using an Extended Gaussian Mixture PHD Filter 10

Tracking of Multiple Sources in an Acoustic Sensor Network u...

引用

10th IEEE sensor array and multichannel signal processing workshop (SAM)

作者： Brendel, Andreas Kellermann, Walter Friedrich Alexander Univ Erlangen Nurnberg Multimedia Commun & Signal Proc Cauerstr 7 D-91058 Erlangen Germany

ISBN: (纸本)9781538647523

We propose an approach for tracking a varying number of simultaneously active acoustic wideband signal sources in an acoustic enclosure. Relying on the assumption of W-disjoint orthogonality, the method uses narrowband position estimates of the sources for the targets. The instantaneous position estimates form clusters rather than single points, as would be required for a conventional Probability Hypothesis Density (PHD) filter. Therefore, we model the position estimates as extended targets and use a special form of the PHD filter, the extended target Gaussian mixture PHD filter, for tracking the targets. This allows to model target birth and death, which correspond to speech onset and end of utterance, respectively. With this model and by using the well-developed theory of Finite Set Statistics (FISST)-based multi-target tracking, we provide a comprehensive, strictly Bayesian treatment of the problem of tracking wideband acoustic sources using narrowband position estimates. We validate the results by tracking a varying number of targets in an enclosure simulated with the image-source method.

关键词： Target tracking Acoustics Direction-of-arrival estimation Narrowband Microphones Bayes methods"

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Node density and range improvement in cooperative networks using randomized Sspace-time block coding with time synchronization errors

Node density and range improvement in cooperative networks u...

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4th IEEE sensor array and multichannel signal processing workshop

作者： Palat, Ramesh Chembil Annamalai, A. Reed, Jeffrey H. Virginia Tech Mobile & Portable Radio Res Grp Blacksburg VA 24061 USA

ISBN: (纸本)1424403081

Cooperative communication in energy-constrained networks is a topic of emerging interest in recent years especially for sensor network applications. We consider cooperative transmission from a cluster of nodes to a remote receiver. The transmission protocol used is randomized orthogonal space-time block coding, which allows each node to randomly transmit one column of a given orthogonal space-time code matrix. Previous work on the topic has shown that the scheme can achieve maximum possible diversity order for a given SNR as the number of cooperating nodes increases. In this paper we examine the range extension achievable under realistic conditions accounting for time synchronization errors and use of pulse shaping filters. We show that the scaling of range as the number of nodes increase with timing error is not linear. It reaches a limit beyond which range improvement is not significant.

关键词： sensor networks

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PC clusters for signal processing: An early prototype

PC clusters for signal processing: An early prototype

引用

1st IEEE sensor array and multichannel signal processing workshop (SAM 2000)

作者： Chapin, J Chiu, A Hu, R MIT Comp Sci Lab Cambridge MA 02139 USA

ISBN: (纸本)0780363396

A cluster of commodity personal computers (PCs) is an attractive platform for signal processing, especially for applications like sensor arrays where there is significant parallelism in the computation. This paper reports the results of experiments with several small cluster configurations to explore the opportunities and limitations of this approach. Experiments included uniprocessor and multiprocessor PCs, 100 MBit/sec and 1 Gbit/sec ethernet. All experiments were receive-only, starting from raw spectrum samples provided by a wideband A/D card, and all signal processing code ran as application processes on top of standard Linux. The applications used to drive the experiments were delay and sum beamforming and the simultaneous reception of multiple AMPS cellular channels. The currently standard PCI I/O bus (32 bits at 33 MHz) was the most significant bottleneck in the experiments. This suggests that the arrival of the next generation of commodity PCs, with faster I/O busses (such as 64-bit PCI at 66 MHz), may open the door to their use as a low-cost platform for a variety of low-end realtime signal processing applications.

关键词： Application software array signal processing Concurrent computing Ethernet networks Microcomputers Parallel processing Personal communication networks Prototypes sensor arrays signal processing

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Incorporating pulse-to-pulse motion effects into side-looking array radar models

Incorporating pulse-to-pulse motion effects into side-lookin...

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4th IEEE sensor array and multichannel signal processing workshop

作者： Green, Justin W. Hale, Todd B. Temple, Michael A. Buckreis, John T. USAF Inst Technol Dept Elect & Comp Engn 2950 Hobson Way Wright Patterson AFB OH 45433 USA

ISBN: (纸本)1424403081

A technique is presented for incorporating pulse-to-pulse (inter-pulse) motion effects into side-looking array radar data models yielding a motion-sensitive space-time snapshot. Low flying, highly-maneuverable Unmanned Aerial Vehicles (UAV) represent a potential worst case application scenario given their roll, yaw, and pitch rates are primarily limited by structural integrity. High degrees of maneuverability during the Coherent processing Interval (CPI) allow clutter and target returns to change significantly. The technique presented uses M coordinate transformations to describe platform attitude variations throughout the CPI. Ward's model then is extended to incorporate maneuver-induced changes in spatial frequency and Doppler. The new motion-sensitive space-time snapshot is used to characterize Space Time Adaptive processing (STAP) performance without motion-compensation applied. Results clearly show motion-induced clutter-null broadening with measurable degradation of STAP algorithm minimal discernable velocity.

关键词： Radar systems

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