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检索条件"任意字段=2008 IEEE Sensor Array and Multichannel Signal Processing Workshop"

共 1267 条记录，以下是81-90 订阅

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FPGA based real-time detection of spikes within neural signals

FPGA based real-time detection of spikes within neural signa...

引用

3rd ieee sensor array and multichannel signal processing workshop

作者： Keuer, A Schrott, R Taube, J Schmück, D Beikirch, H Baumann, W Bionas GmbH D-18119 Rostock Germany

ISBN: (纸本)0780385454

This paper presents a technique for real time multi-channel signal processing of biological neural data. The major objective is the extraction of action potentials from neural data streams continuously acquired from a multi-electrode sensor array. For the actual detection process a wavelet-based method will be proposed, which allows efficient filtering as well as the definition of a robust threshold. In order to match the real time constraints for the wavelet transform an efficient and fast algorithm (lifting scheme) was used. An exemplary 8-channel implementation will be described exploiting the parallel potentials of a Xilinx Virtex field programmable gate array (FPGA). This work is part of a project concerned with the development of a microsensorchip system for neural data analysis at the University of Rostock, Germany.

关键词： Data processing

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Ultrasonic array Imaging for Immersion Non-Destructive Testing

Ultrasonic Array Imaging for Immersion Non-Destructive Testi...

引用

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

作者： Moallemi, Nasim Shahbazpanahi, Shahram Univ Ontario Inst Technol Fac Engn & Appl Sci Oshawa ON Canada

ISBN: (纸本)9781479914814

One of the applications of advanced array signal processing is immersion ultrasonic non-destructive testing (NDT), where a solid test sample and an array of transducers are immersed in water, for the purpose of imaging the test sample. To do so, the knowledge of the shape of the upper surface of the test sample is needed. We model the interface between water and the solid as an incoherently spatially distributed reflector. We then develop a covariance fitting based approach to estimate the parameters of the shape of the upper surface of the test sample. With the knowledge of the estimated shape of this surface, we use the same approach to estimate the parameters of the shape of a crack inside the test sample. Numerical simulations are conducted to show the accuracy of the proposed approach.

关键词： test sample ultrasonic arrays Nondestructive Testing array signal processing Transducers

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Computation of Weight Function of 2qth Order Virtual array to Analyse the Estimation Performance 11

Computation of Weight Function of 2qth Order Virtual Array t...

引用

ieee 11th sensor array and multichannel signal processing workshop (SAM)

作者： Gupta, Payal Agrawal, Monika Indian Inst Technol Ctr Appl Res Elect New Delhi 110016 India

ISBN: (纸本)9781728119465

Increasing the number of sources to be processed from a given array of sensors is an important problem in sensor array signal processing and of interest to many researchers. This problem has also been tackled with the virtual array based approach where the covariance and cumulant lags provide a virtual sensor. Here, an important parameter which affects the parameter estimation accuracy and latency is weight function. The weight function is defined as the frequency of occurrence of each virtual sensor in the virtual array. We provide the close-form expression of virtual array corresponding to linear array. We have also analytically evaluated the weight function of virtual array and have also studied the effect of the weight function on parameter estimation. Simulation results show the parameter estimation accuracy is significantly improve with high weight function.

关键词： DoA estimation Non-circular signals Sparse array Virtual array Cumulants Underdetermined System Weight function Covariance Matrix

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Antenna array Based Positional Modulation with a Two-Ray Multi-Path Model 10

Antenna Array Based Positional Modulation with a Two-Ray Mul...

引用

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

作者： Zhang, Bo Liu, Wei Univ Sheffield Commun Res Grp Dept Elect & Elect Engn Sheffield S1 4ET S Yorkshire England

ISBN: (纸本)9781538647523

Traditional directional modulation (DM) designs are based on the assumption that there is no multi-path effect between transmitters and receivers. One problem with these designs is that the resultant systems will be vulnerable to eavesdroppers which are aligned with or very close to the desired directions, as the received modulation pattern at these positions is similar to the given one. To solve the problem, a two-ray multi-path model is studied for positional modulation and the coefficients design problem for a given array geometry and a location-optimised antenna array is solved, where the multi-path effect is exploited to generate a given modulation pattern at desired positions, with scrambled values at positions around them.

关键词： Modulation array signal processing Receivers Phased arrays sensor arrays"

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Convex Joint Emitter Localization and Passive sensor Network Synchronization

Convex Joint Emitter Localization and Passive Sensor Network...

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ieee 7th sensor array and multichannel signal processing workshop (SAM)

作者： Jean, Oren Weiss, Anthony J. Tel Aviv Univ Sch Elect Engn IL-69978 Tel Aviv Israel

ISBN: (纸本)9781467310710

PATENT PENDING. Time-of-arrival (TOA) localization is tightly coupled with sensor time synchronization. Synchronization can be obtained by GPS, atomic clocks or message exchange protocols. All methods affect the energy sources and the synchronization protocols use valuable bandwidth. We present self-synchronized localization algorithms that rely exclusively on TOA measurements performed by the sensor network on passing sources rendering it completely passive. Localization performance is close to that provided by a perfectly synchronized network. Such algorithms can also be used for sensor network synchronization and communication networks in general.

关键词： sensor networks

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Passive subtractive beamformer for near-field sound sources

Passive subtractive beamformer for near-field sound sources

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3rd ieee sensor array and multichannel signal processing workshop

作者： Mizumachi, M Nakamura, S ATR Spoken Language Translat Res Labs Keihanna Sci City Kyoto 6190288 Japan

ISBN: (纸本)0780385454

This paper describes the problem caused by near-field sound sources. Formerly, the authors proposed a 2-ch passive subtractive beamformer with a single sharp notch for noise reduction. It is obvious that the single sharp notch is insufficient for dealing with near-field, non-point sound sources. To solve this problem, this paper presents the hybrid subtractive beamformer that is realized as a cascade connection of single subtractive beamformers. The number of connections depends on frequency to minimize the negative effect caused by spatial aliasing when an objective signal is assumed as a wide-band speech signal. The experimental results verifies that the hybrid beamformer has an advantage in reducing signal distortion over the original single subtractive beamformer.

关键词： signal processing

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Moving target detection of array antennas based on time reversal 11

Moving target detection of array antennas based on time reve...

引用

ieee 11th sensor array and multichannel signal processing workshop (SAM)

作者： Zhang, Zhaoming Chen, Baixiao Yang, Minglei Xu, Hui Xidian Univ Natl Lab Radar Signal Proc Xian Peoples R China Xidian Univ Sch Elect Engn Xian Peoples R China

ISBN: (纸本)9781728119465

This paper develops a time reversal moving target detector based on array antennas. Time reversal utilizes the multipath effect by retransmitting the received signal containing the Doppler shift of the moving target. Two detectors are derived in both conventional and time reversal scenarios, respectively. The Monte Carlo results show that the time reversal detector significantly improves the target detection probability in multipath environments compared with the conventional detector. The increase of multipath number is helpful to improve the detection probability of time reversal detector.

关键词： time reversal moving target array antennas detection

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Incorporating array Nonidealities Into Adaptive Capon Beamformer for Source Tracking

Incorporating Array Nonidealities Into Adaptive Capon Beamfo...

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ieee 7th sensor array and multichannel signal processing workshop (SAM)

作者： Costa, Mario Koivunen, Visa Aalto Univ Dept Signal Proc & Acoust SMARAD CoE FI-00076 Aalto Finland

ISBN: (纸本)9781467310710

An adaptive algorithm for azimuth-angle estimation of moving sources in the presence of array nonidealities is proposed. The method, termed unitary element-space Capon (UES-Capon) beamformer, is robust in the face of small number of snapshots and fully takes into account effects such as mutual coupling, mounting platform reflections, and sensor's misplacement errors. Unlike most of the robust beamformers available in the literature, the proposed method is based on QR-decomposition and real-valued polynomial root tracking. Furthermore, it is applicable to sensor arrays of arbitrary configuration. Numerical results using a real-world antenna array are included, illustrating the excellent performance of the proposed method, both in terms of SINR and fast adaptivity to moving sources.

关键词： capon sensor arrays Snapshots SINR Self tuning tracking

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Comparing multistatic with monostatic super-resolution array processing techniques: Detection of random targets

Comparing multistatic with monostatic super-resolution array...

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4th ieee sensor array and multichannel signal processing workshop

作者： Ho, Minhtri Lev-Ari, Hanoch Northeastern Univ Dept Elect & Comp Engn Boston MA 02115 USA

ISBN: (纸本)1424403081

Conventional MUSIC (MUltiple signal Classification)rraethod, which is a well-known super-resolution technique that employs amonostatic configuration, degrades severely when themultiple targets are deterministic because the rank of the covariancematrix collapses to the value of one regardless of the number of targets. FRM (Frequency Response Matrix) [2, 7], with its multistatic configuration, is also a super-resolution technique and can complament, MUSIC in the target randomness spectrum. This paper demonstrates that conventional MUSIC performs better for targets with strongly random (complex) amplitudes and FRM performs better for target with weakly random amplitudes (best for deterministic amplitudes).

关键词： array processing

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GENERALIZED COPRIME array CONFIGURATIONS

GENERALIZED COPRIME ARRAY CONFIGURATIONS

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

作者： Qin, Si Zhang, Yimin D. Amin, Moeness G. Villanova Univ Ctr Adv Commun Villanova PA 19085 USA

ISBN: (纸本)9781479914814

A coprime array consists of two uniform linear subarrays that construct an effective difference co-array with certain desirable characteristics. In this paper, we propose a generalized coprime array concept through the compression of the interelement spacing of one constituting subarray. As such, the existing variations of coprime array and nested array structures are represented as special cases. The achievable unique lags as well as consecutive lags in the resulting virtual array are analytically expressed, and the direction-of-arrival estimation performance is examined using both the MUSIC algorithm and sparse signal reconstruction techniques.

关键词： Coprime array sparse array difference co-array direction-of-arrival estimation compressive sensing

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