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检索条件"主题词=detection algorithms"

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Hyperspectral Classification Fusion for Classifying Different Military Targets

Hyperspectral Classification Fusion for Classifying Differen...

引用

IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： George A. Lampropoulos Ting Liu Shen-En Qian Chuhong Fei A.U.G. Signals Limited Toronto ONT Canada Canadian Space Agency Saint Hubert QUE Canada

The objective of this paper is to develop novel classification structures for military targets detection and recognition by employing different fusion techniques. In real applications, the great diversity of materials in the background areas and the similarity between the background and target signatures result in high false alarm rates and large miss classification errors. In this paper, two novel target detection and recognition systems are proposed using different fusion techniques: decision fusion and classification fusion employing confidence vectors. These new systems are tested using an experimental data set to assess their effectiveness.

关键词： Hyperspectral imaging Hyperspectral sensors Classification algorithms Target recognition Classification tree analysis Matched filters Object detection Remote sensing Image sensors detection algorithms

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Target recognition and polarimetric SAR

Target recognition and polarimetric SAR

引用

IEEE National Conference on Radar

作者： Les Novak USA

This tutorial presents a state-of-the-art survey of advanced applications of Synthetic Aperture Radar (SAR). Applications include: the detection and recognition of targets in SAR imagery, and the detection of targets under trees (and in the open) using change detection (coherent change detection, full-polarization change detection, etc). A fully polarimetric SAR sensor is described. Models of clutter and targets are developed from analysis of full-polarization SAR imagery. algorithms for optimum (GLRT) processing of full-polarization data are derived, including the polarimetric whitening filter (PWF) and the polarimetric matched filter (PMF). Polarization-based discrimination features (polarization entropy, anisotropy, etc.) are developed and applied to SAR image terrain classification. Model-based and template-based target recognition systems are described and classifier performance results versus resolution and polarization are summarized for 10-and 20-target classifiers. Super-resolution algorithms are applied to SAR imagery and target recognition performance improvements demonstrated. Multi-polarization and multi-pass change detection algorithms are developed and demonstrated using UHF SAR imagery of targets under trees; fusion of multi-polarization coherent and non-coherent change detection algorithms is demonstrated. The effect of SAR image compression on change detection performance is quantified. Change detection performance using multi-pass VHF SAR imagery of targets under trees is demonstrated using data gathered by the Swedish CARABAS SAR system.

关键词： Target recognition Radar detection Polarization Synthetic aperture radar Change detection algorithms Matched filters detection algorithms Image recognition Sensor phenomena and characterization Clutter

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Quickest spectrum sensing in cognitive radio

Quickest spectrum sensing in cognitive radio

引用

Annual Conference on Information Sciences and Systems (CISS)

作者： Husheng Li Chengzhi Li Huaiyu Dai Department of electrical engineering and computer science University of Tennessee Knoxville TN USA National Science Foundation USA Department of electrical and computer engineering North Carolina State University Raleigh NC USA

Quickest detection is applied to frequency spectrum sensing in cognitive radio systems. Distribution change in frequency domain is detected for vacating secondary radio networks from licensed frequency band. A successive refinement based quickest detection is proposed to tackle the problem of unknown parameters of primary radio signal. Cooperative quickest detection is used to enhance the performance of quickest spectrum sensing in secondary radio systems without data fusion centers. Performance is evaluated using theoretical analysis and numerical simulations.

关键词： Cognitive radio Testing Performance analysis Monitoring Frequency domain analysis Digital TV RF signals Radio network Numerical simulation detection algorithms

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Meteorological Command & Control: Architecture and Performance Evaluation

Meteorological Command & Control: Architecture and Performan...

引用

IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Michael Zink Eric Lyons David Westbrook David Pepyne Brenda Pilips Jim Kurose V. Chandrasekar University of Massachusetts Amherst Amherst MA USA Colorado State University Fort Collins CO USA

IP1 is a prototype CASA radar sensor network located in southwestern Oklahoma whose goal is to detect severe weather in the lower part of the atmosphere. At the center of this system's control loop is its Meteorological Command and Control (MC&C). In this paper, we presented the overall control architecture for the IP1 network and highlight new features that have recently been added to the MC&C. We also present an analysis of the MC&C performance based on measurement data from a 5-day operation period. In addition, we introduce a distributed version of the MC&C.

关键词： Meteorology Meteorological radar detection algorithms Radar detection Control systems Collaboration Spaceborne radar Computer architecture Heart beat Prototypes

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Transformed-based mode decision algorithm for H.264/AVC intraprediction

Transformed-based mode decision algorithm for H.264/AVC intr...

引用

IEEE Asia-Pacific Conference on Circuits and Systems

作者： Heng-Yao Lin Kuan-Hsien Wu Bin-Da Liu Jar-Ferr Yang Department of Electrical Engineering National Cheng Kung University Tainan Taiwan

In this paper, a fast intra mode decision algorithm based on transform-domain property is proposed to reduce the coding complexity in H.264/AVC encoder. According to the basis patterns for DCT transformation, the 4 times 4 block is first transformed and then the transformed coefficients are utilized to detect the tendency of target block. In comparison to the previous fast mode decision algorithms, which measure the edge direction by complex arithmetic operations, the proposed algorithm simplifies the procedure of detection method. Experimental results show that the proposed algorithm can support more accurate prediction in the least bit-rate increment, which outperforms the intra coding time approximately by 55% of the full search method.

关键词： Automatic voltage control Discrete cosine transforms Algorithm design and analysis detection algorithms Electronic mail Arithmetic Search methods Multimedia communication Video coding Communication standards

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Thresholded Interference Cancellation Algorithm for the LTE Uplink Multiuser MIMO

Thresholded Interference Cancellation Algorithm for the LTE ...

引用

IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

作者： Xinzheng Wang Pengcheng Zhu Ming Chen National Mobile Communications Research Laboratory South-East University Nanjing China

Single carrier frequency division multiple access (SC-FDMA) is adopted as uplink multiple access scheme in 3G long-term evolution (LTE). Combining SC-FDMA with MIMO (multiple-input multiple-output) can increase capacity and throughput but detection technique is required at the base station (BS). Interference cancellation (IC) based on cyclic redundancy check (CRC) is a conventional detection algorithm. In this paper, we divide IC into useful IC and useless IC. Simulation results indicate that CRC-based IC algorithm performs too many useless ICs, which increases the complexity. Thresholded IC algorithm is proposed to reduce the complexity. In the proposed algorithm, IC is performed only when the probability that the IC is useful exceeds a threshold. We select 0.5 as the threshold. With the threshold, the proposed algorithm reduces the complexity significantly and keeps the performance loss negligible.

关键词： Interference cancellation MIMO Frequency conversion Cyclic redundancy check detection algorithms Discrete Fourier transforms Fading Peak to average power ratio Throughput Base stations

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Enhanced Soft Interference Cancellation Algorithm for V-BLAST Systems

Enhanced Soft Interference Cancellation Algorithm for V-BLAS...

引用

IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

作者： Zhendong Luo Fan Yang Institute of Communication Standards Research MII China Academy of Telecommunication Research CATR Beijing China School of Information Engineering Beijing University of Posts and Telecommunications Beijing China

In this paper, we investigate soft interference cancellation algorithms for vertical Bell Laboratories layered space- time (V-BLAST) systems. By using Gaussian-forcing technique and fast matrix computation, we first derive a simplified version of the conventional generalized probabilistic data association (GPDA) algorithm, called the fast soft interference cancellation (FSIC) algorithm, whose complexity is only cubic in the number of transmit/receive antennas. Then, based on the FSIC algorithm, we develop an enhanced soft interference cancellation (ESIC) algorithm by making use of the properties of MIMO channels. It is shown that with efficient iterative processing, the ESIC algorithm can achieve near-optimal performance in both uncoded systems and coded systems.

关键词： Interference cancellation Iterative algorithms Silicon carbide Receiving antennas MIMO Detectors Gaussian processes detection algorithms Transmitting antennas Iterative decoding

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An Image-Based Circle Extraction Method of Three-Dimensional Point Cloud Data

An Image-Based Circle Extraction Method of Three-Dimensional...

引用

International Symposium on Intelligent Information Technology Application, IITA

作者： Tao Liu Weiling Zhao Zongyi Wang Shaojing Jia College of Automation Harbin Engineering of Technology Harbin Heilongjiang China

The fast feature extraction of point cloud data becomes one core of the reverse-engineering CAD modeling researches that are based on point cloud. In the two-dimensional or three-dimensional product contour, the circle is a very common shape. This paper proposed a new circle extraction method of three-dimensional point cloud data, which is based on the image. This method takes full advantage of the point cloud features and the image, as well as the ellipse detection algorithm of image, for extracting the circle from the three-dimensional point cloud. From the experiment results, we can observe that this method is simple, time-saving and easy to realize.

关键词： Data mining Clouds Image edge detection Feature extraction Scattering Shape detection algorithms Manufacturing Reverse engineering Solid modeling

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An Interleaver-Based Asynchronous Cooperative Diversity Scheme for Wireless Relay Networks

An Interleaver-Based Asynchronous Cooperative Diversity Sche...

引用

IEEE International Conference on Communications (ICC)

作者： Z. Fang L. Li Z. Wang Department of Communications Science and Engineering Fudan University Shanghai China

Distributed space time coding can achieve full spatial diversity in wireless relay networks. However, it requires accurate symbol-level synchronization and priori coordination between cooperative relay terminals, which is difficult to implement in distributed networks. In this paper, we propose a novel scheme based on interleaving to achieve cooperative diversity in both synchronous and asynchronous networks with little protocol overhead. A low complexity iterative detection algorithm is also proposed to combine signals from different relays at the receiver. The simulation results demonstrate the comparable performance to space-time codes based cooperative schemes which require perfect synchronization and coordination.

关键词： Relays Protocols Space time codes Broadcasting detection algorithms Transmitting antennas Decoding Cultural differences Interleaved codes MIMO

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An Efficient MIMO V-BLAST Decoder Based on a Dynamically Reconfigurable FPGA Including its Reconfiguration Management

An Efficient MIMO V-BLAST Decoder Based on a Dynamically Rec...

引用

IEEE International Conference on Communications (ICC)

作者： H. Wang P. Leray J. Palicot SUPELEC/IETR Cesson-Sevigne France

This paper introduces a reconfigurable MIMO V-BLAST (vertical Bell Laboratories layered space-time) square root decoder that is CORDIC operators based, allows for dynamically changing the interconnections between the CORDIC (coordinate rotation digital computer) operators. These interconnections of CORDIC operators are implemented in a partial reconfigurable part of FPGA using the dynamic reconfiguration method which improves both the reconfiguration time and the area efficiency. Moreover, this reconfiguration time improvement is increased thanks to the MicroBlaze (within the FPGA) in which is included the reconfiguration management. This MIMO square root decoder is mapped on a Xilinx Virtex-4, showing the configuration time improvement, area efficiency and flexibility of the decoder by using the dynamic partial reconfiguration method.

关键词： MIMO Field programmable gate arrays Maximum likelihood decoding Signal processing algorithms Detectors Bit error rate Communications Society Wireless communication detection algorithms Hardware

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