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检索条件"任意字段=2nd IEEE Sensor Array and Multichannel Signal Processing Workshop"

共 469 条记录，以下是181-190 订阅

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Identifiability of geometric models for linear unmixing at different spatial resolutions in hyperspectral unmixing

Identifiability of geometric models for linear unmixing at d...

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workshop on Hyperspectral Image and signal processing

作者： Santos-García, Andrea Velez-Reyes, Miguel Laboratory for Applied Remote Sensing and Image Processing University of Puerto Rico-Mayagüez Puerto Rico

ISBN: (纸本)9781424489077

Proposed and existing hyperspectral remote sensors, provide information about the scene of interest at resolutions ranging from few meters to few kilometers in terrestrial and space applications. Understanding the type of information extracted with image exploitation algorithms and how does it relates to actual spectra on the ground are important problems when we look into algorithms that perform unmixing of hyperspectral images for subpixel analysis. In this paper, we investigate how spatial resolution affects the capability of unmixing algorithms based on geometric models to extract information from a scene. We study the performance of the positive matrix factorization for unmixing of hyperspectral at different spatial resolutions and how does it compare with other approaches such as MaxD, and SMACC. Hyperspectral imagery collected using the AISA sensor at 1m and 4m are used for the experiments. The results obtained illustrate some of the effects that algorithms assumptions have on unmixing results. ©2010 ieee.

关键词： Space applications

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Gas detection by carbon nanotube gas-ionization sensor based on Lyapunov exponent

Gas detection by carbon nanotube gas-ionization sensor based...

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2010 2nd International Conference on Industrial Mechatronics and Automation, ICIMA 2010

作者： Hui, Guohua College of Food Science and Biotechnology Zhejiang Gongshang University Hangzhou 310035 China

ISBN: (纸本)9781424476541

In this paper, a novel method utilizing a multi-walled carbon nanotube (MWNT) gas-ionization sensor based on Lyapunov exponent algorithm was proposed for argon, ethanol, acetone, and ammonia detection. The sensor was used as anodic sensor. Responses of MWNT sensor to four gases was measured and processed by Lyapunov exponent. Experimental results showed that the MWNT sensor array based on Lyapunov exponent could distinguish gas species successfully. ©2010 ieee.

关键词： signal processing

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Detection of occluded targets using thermal imaging spectroscopy

Detection of occluded targets using thermal imaging spectros...

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workshop on Hyperspectral Image and signal processing

作者： Shimoni, M. Perneel, C. Gagnon, J.-P. Brussels Belgium Dept. of Mathematics Royal Military Academy Brussels Belgium Telops Inc. 100-2600 St-Jean-Baptiste Québec QC G2E 6J5 Canada

ISBN: (纸本)9781424489077

Automatic detection of occluded targets from a sequence of images is an interesting area of research for defense related application. In this paper, change detection methods are investigated for the detection of buried improvised explosive devices (IED) using temporal thermal hyperspectral scenes. Specifically, the paper assesses the detection of buried small aluminium plates using the TELOPS Hyper-Cam sensor and by applying two change detection algorithms: multivariate statistical based method (Cross-Covariance (CC)) and class-conditional change detector (QCC). It was found that spectral based change detection is a good method for the detection of buried IED under disturbed soil. Moreover, the Cross-Covariance (CC)) and the class-conditional (QCC) change detector were able to detect changes using short temporal sequences as long temporal sequences pairs. ©2010 ieee.

关键词： Object detection

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The Video Capture and processing Research on Smart Car Road Information Based on OV7620 Camera

The Video Capture and Processing Research on Smart Car Road ...

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2nd International Asia Conference on Informatics in Control, Automation and Robotics (CAR)

作者： Jiang, Zhijun Wang, Mingfa Gong, Wei Nanchang Univ Informat Engn Coll Nanchang Jiangxi Peoples R China

ISBN: (纸本)9781424451944

In this paper, the road information collection systems and processing algorithms of video signal was researched based on vision sensor, the processor of Smart car used MC9S12XS128, the hardware of Sampling system using OV7620 digital camera;The key of software part is the turn of double-array storage and processing technology, which made the Acquisition system has higher efficiency, more in line with the requirements of real-time. Experiments have proved that the algorithm has good real-time performance, reliability and robustness.

关键词： OV7620 Video Acquisition Image processing Visual Navigation Edge Detection

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Space-time compressive sampling array

Space-time compressive sampling array

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sensor array and multichannel signal processing workshop

作者： Ying Wang Geert Leus Philips Research Europe Eindhoven Netherlands Department of EEMCS Delft University of Technnology Netherlands

We propose a space-time compressive sampling (STCS) array architecture by exploiting the sparsity in the angle and frequency domain. Two Doppler-DoA estimation methods are designed to efficiently reconstruct the two-dimensional (2D) sparse signal. The STCS array together with the 2D reconstruction methods allow for accurate yet low-power location and speed estimation of moving targets. The proposed methods are not only tested by simulations but also using an experimental ultrasonic sensor array setup.

关键词： arrays Estimation Baseband Frequency estimation Sparse matrices Receivers Doppler effect

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Adapting a MIMO/phased-array radar transmit beampattern to target location

Adapting a MIMO/phased-array radar transmit beampattern to t...

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International workshop on Cognitive Information processing

作者： Fuhrmann, Daniel R. Browning, J. Paul Rangaswamy, Muralidhar Department of Electrical and Computer Engineering Michigan Technological University Houghton MI 49931 United States U.S. Air Force Research Laboratory Sensors Directorate Radar Signal Processing Branch Wright-Patterson AFB OH United States

ISBN: (纸本)9781424464593

Proposed MIMO and hybrid MIMO/phased array (HMPAR) radar systems have the potential for tremendous flexibility in the choice of the transmit beampattern, through the selection of multiple transmitted signals. This paper considers how one might exploit that flexibility in light of prior information or uncertainty in target spatial location, for parameter estimation or tracking applications. We first consider an idealized problem of distributing energy across multiple target sites given a prior probability distribution on those sites. It shown that the optimal allocation of energy would be proportional to the square root of the prior probability. Second, we propose a method to approximate this optimal distribution of energy using a MIMO radar or HMPAR radar system. The method chooses signals that realize an intrapulse beamscan over the region of interest, with a nonuniform distribution of scan points matched to the desired distribution of energy. © 2010 ieee.

关键词： MIMO radar

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Closed-form expression of the Weiss-Weinstein bound for 3D source localization: The conditional case

Closed-form expression of the Weiss-Weinstein bound for 3D s...

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sensor array and multichannel signal processing workshop

作者： Dinh Thang Vu Alexandre Renaux Rémy Boyer Sylvie Marcos Laboratoire des signaux et systèms (L2S) CNRS SUPELEC Université Paris-Sud XI Gif-sur-Yvette France

In array processing, lower bounds are used as a benchmark to evaluate the ultimate performance of estimators. Among these bounds, the Weiss-Weinstein bound (WWB) is known as the tightest bound of Weiss-Weinstein family, and is able to predict the threshold effect of estimator's mean square error (MSE) at low signal-to-noise ratio (SNR) and/or at low number of snapshots. In this paper, we derive a closed-form expression of the WWB for 3D source localization using an arbitrary planar antenna array in the case of a deterministic known signal. The presented results are shown to be useful for system design such as array geometry optimization.

关键词： arrays Estimation signal to noise ratio Closed-form solution Three dimensional displays Direction of arrival estimation

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Two-dimentional direction-of-arrival estimation of coherent signals with L-sharped array

Two-dimentional direction-of-arrival estimation of coherent ...

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sensor array and multichannel signal processing workshop

作者： Guangmin Wang Jingmin Xin Nanning Zheng Institute of Artificial Intelligence and Robotics Xi'an Jiaotong University China

In this paper, a new method is proposed for two-dimensional (2-D) direction-of-arrivals (DOAs) estimation of multiple narrowband coherent signals impinging on an L-shaped sensor arrays structured by two uniform linear arrays (ULAs). The coherency of incident signals is decorrelated through subarray averaging technique, and the null space is obtained through linear operator of the cross-correlation matrix between the received data of two ULAs without eigendecomposition. The elevation angles and the quasi-azimuth angles are firstly decoupled and estimated, and the pair-matching of two groups of angles can be accomplished by using a novel method. Then by investigating the geometrical relationship, the azimuth angles can be obtained. Furthermore the asymptotic mean-square-error (MSE) of the estimated elevation and azimuth angles are derived, and the effectively of the proposed method is verified through numerical examples.

关键词： arrays Estimation Direction of arrival estimation Covariance matrix signal to noise ratio Azimuth Antennas

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Vectored VDSL from a practical perspective: ISmart FEXT cancellation performance

Vectored VDSL from a practical perspective: ISmart FEXT canc...

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sensor array and multichannel signal processing workshop

作者： Ronen Yizhaq Gilad Elad Domanovitz Amit Priebatch Ilan Sharfer Avi Matza Eitan Tsur Product Innovation Actelis Networks Limited Petach Tikva Israel Access Research and Development Network Solutions Division ECI Telecom Limited Petach Tikva Israel

Far End Crosstalk (FEXT) in a twisted pair cable is the most dominant noise impairment in short loops for VDSL2 systems. Its impact significantly reduces the VDSL2 modems performance and in some cases might reduce the modem throughput by more than 50%. Canceling the FEXT impact using Dynamic Spectral Management Level 3 (DSM L3, aka Vectoring aka FEXT Cancellation) is an emerging technology for high rates data traffic over copper (Up to 100Mbit/sec). We have developed an eight VDSL2 modems prototype with DSM L3 capabilities. In this article we introduce an overview of our system design and a variety of tests results that reflect the DSM L3 potential.

关键词： Modems Crosstalk DSL Estimation Conferences signal processing Copper

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New trends in deterministic lower bounds and SNR threshold estimation: From derivable bounds to conjectural bounds

New trends in deterministic lower bounds and SNR threshold e...

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sensor array and multichannel signal processing workshop

作者： Eric Chaumette Alexandre Rénaux Pascal Larzabal French AeroSpace Laboratory ONERA/DEMR/TSI Palaiseau France L2S Supelec Université Paris-Sud 11 Gif-Sur-Yvette France SATIE ENS Cachan UniverSud-CNRS Cachan France

It is well known that in non-linear estimation problems the ML estimator exhibits a threshold effect, i.e. a rapid deterioration of estimation accuracy below a certain SNR or number of snapshots. This effect is caused by outliers and is not captured by standard tools such as the Cramér-Rao bound (CRB). The search of the SNR threshold value can be achieved with the help of approximations of the Barankin bound (BB) proposed by many authors. These approximations may result from linear or non-línear transformation (discrete or integral) of the uniform unbiasedness constraint introduced by Barankin. Additionally, the strong analogy between derivations of deterministic bounds and Bayesian bounds of the Weiss-Weinstein family has led us to propose a conjectural bound which outperforms existing ones for SNR threshold prediction.

关键词： Indexes

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