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DoA and Polarization Estimation using Arbitrary Polarimetric array Configurations

DoA and Polarization Estimation using Arbitrary Polarimetric...

引用

sensor array and multichannel signal processing workshop

作者： A. Richter F. Belloni V. Koivunen Signal Processing Laboratory SMARAD CoE Helsinki University of Technology Finland

In this paper we propose an algorithm for angle and polarization estimation of non-coherent sources using real-world polarimetric antenna arrays. In order to construct an accurate model of an antenna array, we exploit its effective aperture distribution function (EADF). This model contains information on the array response for a vertical and horizontal excitation, the directional characteristic of each element, and array imperfections. Here, we propose a method stemming from the RARE (rank-reduction estimator) algorithm. It performs fast (search-free) DoAs and polarization coefficients estimation. Throughout simulation results, we verify that the algorithm has close to optimal statistical performance with polarimetric real-world arrays. We present the statistical performance for three different array configurations

关键词： Direction of arrival estimation Polarization sensor arrays signal processing algorithms Antenna arrays array signal processing Distribution functions sensor phenomena and characterization Goniometers Antenna measurements

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Performance of DCMP Adaptive array Utilizing Aggregated Microphones

Performance of DCMP Adaptive Array Utilizing Aggregated Micr...

引用

sensor array and multichannel signal processing workshop

作者： M. Matsumoto S. Hashimoto Department of Applied Physics Waseda University Tokyo Japan

Recently, the authors proposed a miniaturized microphone array not utilizing the phase difference but utilizing the directivity of each microphone, namely aggregated microphones. We have already showed that the phased microphone array and the aggregated microphones can be described within the same framework. We have also showed that it is possible to apply the aggregated microphones to the various methods of the phased microphone array. However, the difference of the performance between the phased array and the aggregated microphones has not been evaluated yet. The effect of the directivity and the posture of each microphone on the performance of the aggregated microphones has not also been evaluated yet. In this paper, we evaluate the performance of DCMP (directionally constrained minimization of power) adaptive array utilizing aggregated microphones

关键词： Microphone arrays Adaptive arrays Phased arrays Delay estimation Direction of arrival estimation Robots Physics Phase estimation Transfer functions Symbiosis

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Recent Breakthroughs in Phased arrays and Radar

Recent Breakthroughs in Phased Arrays and Radar

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sensor array and multichannel signal processing workshop

作者： E. Brookner Raytheon Company Sudbury MA USA

This paper describes some of the recent breakthroughs in phased arrays and radar, including the sea-based X-band (SBX) radar, the 35 GHz active phased array, and the low cost MEMS phased array. It also discusses recen... 详细信息

关键词： Phased arrays Radar sensor arrays Conferences Gas detectors Costs Micromechanical devices Gallium nitride Silicon carbide

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Interference Cancellation using a Single Snapshot

Interference Cancellation using a Single Snapshot

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sensor array and multichannel signal processing workshop

作者： H. Belkacemi H. Semira S. Marcos Laboratoire des Signaux et Systémes CNRS/Supélec Gif-sur-Yvette France Electronic and Electrical engineering Department Annaba University Algeria

In this paper, we show that a single snapshot using a uniform linear array can be applied to interferences cancellation problems in spatial array signal processing. In this context, the antenna weight vector is calculated using a projection matrix constructed from a single snapshot instead of using the eigen-decomposition of the sample covariance matrix. The benefits of this method are two-fold; it reduces the computational cost required by the eigen-decomposition and the number of snapshots. We demonstrate the effectiveness of the proposed method through simulations of different scenarios including coherent and uncorrelated interferences

关键词： Interference cancellation sensor arrays array signal processing signal processing algorithms signal to noise ratio Linear antenna arrays Covariance matrix Interference constraints Electrical engineering Vectors

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A Lattice Viewpoint for Direction of Arrival Estimation using Quantized Time Differences of Arrival

A Lattice Viewpoint for Direction of Arrival Estimation usin...

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sensor array and multichannel signal processing workshop

作者： T.W. Pirinen Institute of Signal Processing Tampere University of Technology Tampere Finland

Direction of arrival (DOA) estimation from time differences of arrival (TDOA) is used in several array systems. In some cases, practical constraints may necessitate the use of heavily quantized TDOA estimates. The quantization in TDOAs also causes the directional estimate to be quantized. This paper proposes a lattice-based representation for the quantization scenario. This representation can be used to evaluate the performance of a given array when TDOAs are quantized and it also provides guidelines for optimum array design. In addition, the lattice structure can be used for evaluating the reliability of DOA estimates when other errors are present

关键词： Lattices Direction of arrival estimation Quantization sensor arrays Surveillance Error analysis sensor systems Delay estimation array signal processing Guidelines

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A New Near-Field Source Localization Algorithm without Pairing Parameters

A New Near-Field Source Localization Algorithm without Pairi...

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sensor array and multichannel signal processing workshop

作者： Junli Liang Shuyuan Yang Junying Zhang Institute of Acoustics Chinese Academy and Sciences Beijing China National Laboratory of Radar Signal Processing Xidian University Xi'an China

ISBN: (纸本)1424403081

In this paper, we propose a new near-field source localization algorithm without any spectral peak searching or parameter pairing. Firstly, based on fourth-order cumulant of the outputs of a uniform linear array (ULA), we derive a multiple invariance-sensor array processing (MI-SAP)-type data model using the formed cumulant matrices. Secondly, the DOA, range, and frequency parameters are estimated from the matrices got via trilinear decomposition of three-way array. Finally, simulation results are presented to validate the performance of the proposed method

关键词： Frequency estimation signal processing algorithms sensor arrays Matrix decomposition Direction of arrival estimation Sonar navigation Radar tracking Propagation delay Narrowband Delay estimation

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Analysis of the Directivity Gain of a Synthetic Aperture in Active and Passive Modes

Analysis of the Directivity Gain of a Synthetic Aperture in ...

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sensor array and multichannel signal processing workshop

作者： D. Billon Thales Underwater Systems Brest France

While synthetic aperture sonar is now a mature technology for active imaging of the sea floor, its use for improving passive detection or localisation of underwater acoustic sources is still a research issue. In the first part, we show that the phase shifts for passive synthetic aperture beamforming do not depend on the steering direction. Hence a passive synthetic aperture has the same directivity pattern like the real aperture that it originates from. The directivity gain of an active synthetic aperture is caused by the phase origin reset at each transmit time resulting in a phase discontinuity depending on the bearing angle. Model-based array processing (MBAP), which estimates a source state from the array vector signal, has been proposed as an alternative to passive synthetic aperture for improving source localization. In the second part, we propose a MBAP approach based on a hidden Markov model (HMM) where the signal phase is a third order polynomial. Numerical simulation shows that it does not improve the bearing angle accuracy with respect to an HMM tracker performing on the square magnitude output of real aperture beamforming. This result is in accordance with the fact that both estimators meet the same Cramer-Rao lower bound. But the new method has interesting detection potential

关键词： Hidden Markov models array signal processing Synthetic aperture sonar Acoustic imaging Sea floor Acoustic signal detection Sonar detection Underwater tracking Underwater acoustics State estimation

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Performance analysis of Krylov space adaptive beamformers

Performance analysis of Krylov space adaptive beamformers

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sensor array and multichannel signal processing workshop

作者： I.P. Kirsteins Hongya Ge Naval Undersea Warfare Center Newport RI USA Department of ECE New Jersey Institute of Technology Newark NJ USA

The performance of Krylov subspace-based dimensionality reduction for adaptive beamforming is analyzed using a simple second-order Taylor series approximation to the mean output signal-to-noise ratio (SNR). It is shown that the predicted SNRs accurately follow the experimentally measured SNR and explain the threshold effects when the angles or spacing are varied between the signal mode (subspace) and interference modes (subspace). Furthermore, we discuss how the SNR approximation can be applied to calculating the deflection of a Krylov subspace dimension-reduced Capon's test statistic.

关键词： Performance analysis array signal processing sensor arrays Space technology signal analysis Taylor series signal to noise ratio Interference Statistical analysis Real time systems

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Adaptive wideband beamforming with robustness against presteering errors

Adaptive wideband beamforming with robustness against preste...

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sensor array and multichannel signal processing workshop

作者： A. El-Keyi T. Kirubarajan A.B. Gershman Department of Electrical and Computer Engineering McMaster University Hamilton ONT Canada Institute of Telecommunications Darmstadt University of Technology Darmstadt Germany

We develop a wideband adaptive beamformer with an improved robustness against presteering errors. The proposed beamformer employs the presteered broadband array processor and models the uncertainty in the array manifold as norm-bounded phase errors at the outputs of the presteering delay filters. A state-space model is developed for this robust beamforming problem, and an extended Kalman filter (EKF) is used to estimate the beamformer weight vector adaptively with a low computational complexity.

关键词： Wideband array signal processing Robustness Phased arrays Delay sensor arrays Finite impulse response filter Uncertainty Computer errors Frequency

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Indoor Localization using Subspace Matching: An Experimental Evaluation

Indoor Localization using Subspace Matching: An Experimental...

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sensor array and multichannel signal processing workshop

作者： H. Tsuji S. Kikuchi M. Kaveh National Institute of Information and Communications Technology Yokosuka Japan School of Integrated Design Engineering Keio University Yokohama Japan University of Minnesota Minneapolis MN USA

We propose a method of indoor localization using array sensors. This method uses not only the signal strengths of received signals, but also the spatial information of impinging signals on array sensors. The signal subspaces, which include information about the strengths and angles of arrival of impinging signals on the array sensors, are used to identify the location of the terminal. We use the cosines of the principal angles between the signal subspaces of the spatial covariance matrices of the signals received at an array antenna to measure the similarity between signals transmitted from two locations. We conducted an experiment indoors to confirm the validity and effectiveness of our method. The experimental results confirm its effectiveness

关键词： sensor arrays Fingerprint recognition Covariance matrix signal processing Radio transmitters Antenna arrays Receiving antennas Pattern matching Transmitting antennas Antenna measurements

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