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Fourth IEEE Workshop on Sensor Array and Multichannel Processing, 2006.

Date 12-14 July 2006

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Displaying Results 1 - 25 of 158
  • Robust adaptive beamforming using variable loading

    Publication Year: 2006, Page(s):1 - 5
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (271 KB) | HTML iconHTML

    It is well known that the performance of adaptive beamformers may degrade in the presence of steering errors or lack of training data. Diagonal loading of the sample covariance matrix is a popular technique applied to the minimum variance/minimum power distortionless response beamformer to increase robustness of the array system. However, this technique induces a trade-off between sidelobe suppres... View full abstract»

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  • Single-snapshot beamformer performance using large arrays with faulty sensors

    Publication Year: 2006, Page(s):6 - 10
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (145 KB) | HTML iconHTML

    Large sensor arrays are prone to element failures which can seriously degrade their performance. In the event of sensor failures, conventional non-adaptive re-design of array weights for the resulting non-uniform or even sparse array often leads to undesirable mainlobe-versus-sidelobe level trade-offs. Alternatively, adaptive array processing techniques can be employed but for large arrays it can ... View full abstract»

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  • Adaptive wideband beamforming with robustness against presteering errors

    Publication Year: 2006, Page(s):11 - 15
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB) | HTML iconHTML

    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 (E... View full abstract»

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  • Performance analysis of Krylov space adaptive beamformers

    Publication Year: 2006, Page(s):16 - 20
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB) | HTML iconHTML

    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) ... View full abstract»

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  • A hierarchical Bayesian approach to direction finding and beamforming

    Publication Year: 2006, Page(s):21 - 25
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (283 KB) | HTML iconHTML

    It is well known in array processing that general multiple signal model based approaches for direction of arrival estimation, such as maximum likelihood (ML) or maximum a posteriori (MAP) estimation, are optimal. The major drawbacks of these approaches, is that not only do we need to know the number of signals a priori, but these methods also involve multivariate nonlinear maximizations which can ... View full abstract»

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  • Performance tradeoffs among beamforming approaches

    Publication Year: 2006, Page(s):26 - 30
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (155 KB) | HTML iconHTML

    In this paper, three main criteria for the adaptive beamformer design are discussed: maximal signal-to-interference-plus-noise ratio (MSINR), minimal mean-squared error (MMSE), and minimal least-square error (MLSE). Although in the case of exactly known power and steering vector of the signal-of-interest (SOI), there are beamformers that can simultaneously meet the MMSE and MSINR criteria, this is... View full abstract»

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  • Design of Reduced-Rank MVDR Beamformers under Finite Sample-Support

    Publication Year: 2006, Page(s):31 - 35
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (194 KB) | HTML iconHTML

    The design of optimal reduced-rank minimum variance beamformers based on the Krylov-subspace spanned by the covariance matrix of the array observations is addressed. We concentrate on finite sample-support situations that naturally appear in practice when the number of antennas and the sample-size are comparable in magnitude. The design of the coefficients of the resulting polynomial expansion is ... View full abstract»

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  • Extreme Beam Broadening using Phase Only Pattern Synthesis

    Publication Year: 2006, Page(s):36 - 39
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB) | HTML iconHTML

    This paper describes methods for broadening the beam of a phased array antenna using phase-only element weights. This type of broadening can be valuable for improving the search occupancy and/or reducing the search frame time for large phased arrays, when transmit beam broadening is combined with multiple simultaneous receive beams. Phase-only broadening is required for typical solid-state (active... View full abstract»

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  • IMP-Based Fast Adaptive Beamforming Algorithms

    Publication Year: 2006, Page(s):40 - 44
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (285 KB) | HTML iconHTML

    This paper is concerned with new fast adaptive beamforming algorithms which are based on the internal model principle, to deal with fast fading environment to track the desired signal changes and suppress the interferences. The LMS and RLS algorithms for constructing nulls are derived by incorporating an AR model into the weight dynamics, and then can track fast fading environment. The convergence... View full abstract»

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  • 2006 IEEE SAM - 2006 IEEE Sensor Array and Multichannel Signal Processing Workshop Proceedings

    Publication Year: 2006, Page(s): 0_1
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    Freely Available from IEEE
  • 2006 IEEE SAM - Workshop Committees

    Publication Year: 2006, Page(s): 0_2
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    Freely Available from IEEE
  • 2006 IEEE SAM - Welcome from the General Chairs

    Publication Year: 2006, Page(s): 0_3
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  • 2006 IEEE SAM - Distinguished Lecturers [list of presentations]

    Publication Year: 2006, Page(s): 0_4
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  • 2006 IEEE SAM - Table of contents

    Publication Year: 2006, Page(s):0_5 - 0_13
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    Freely Available from IEEE
  • 2006 IEEE SAM - Author Index

    Publication Year: 2006, Page(s):0_14 - 0_21
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  • 2006 IEEE SAM - Copyright

    Publication Year: 2006, Page(s): 0_22
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    Freely Available from IEEE
  • A Wideband Kalman DOA Tracking Algorithm

    Publication Year: 2006, Page(s):45 - 49
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (162 KB) | HTML iconHTML

    In this paper, a new direction of arrival (DOA) tracking algorithm is presented. We assume that the signals exhibit cyclostationarity, which is exploited to perform signal selective DOA tracking. A least squares (LS) tracking algorithm is first presented. Then a Kalman filter is applied to this algorithm to improve the performance of DOA tracking. Simulations are carried out to demonstrate the eff... View full abstract»

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

    Publication Year: 2006, Page(s):50 - 54
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (330 KB) | HTML iconHTML

    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 u... View full abstract»

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  • DoA and Polarization Estimation using Arbitrary Polarimetric Array Configurations

    Publication Year: 2006, Page(s):55 - 59
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB) | HTML iconHTML

    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... View full abstract»

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  • Efficient and Accurate Rectangular Window Subspace Tracking

    Publication Year: 2006, Page(s):60 - 64
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB) | HTML iconHTML

    In this paper, we describe a rectangular window subspace tracking algorithm, which tracks the r largest singular values and corresponding left singular vectors of a sequence of n times c matrices in O(nr2) time. This algorithm is designed to track rapidly changing subspaces. It uses a rectangular window to include a finite number of approximately stationary data columns. This algorithm ... View full abstract»

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  • The Array Geometry Design in Airborne Microwave 2-D Direction Finding

    Publication Year: 2006, Page(s):65 - 69
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (582 KB) | HTML iconHTML

    The resolving ambiguity of phase interferometer is necessary when the baseline separation between elements exceeds half wavelength since the phase difference between elements can only be measured modulo 2pi. It is difficult to meet the condition the minimum distance between two antennas is less than half wavelength for avoiding ambiguity in wideband operation. In this paper, we propose a simple an... View full abstract»

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  • Unitary Cyclic MUSIC for Direction Finding in GPS Receivers

    Publication Year: 2006, Page(s):70 - 73
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (165 KB) | HTML iconHTML

    Several anti-jam techniques for GPS receivers rely on the direction-of-arrival (DOA) of the satellite signals. These angles change with moving GPS receiver platforms and, as such, they should be constantly estimated for the purpose of jammer nulling and beamforming. In this paper, we propose a new approach for directional finding for multi-antenna GPS receivers. This approach is based on a new uni... View full abstract»

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  • Direction-Finding Results for a Vector Sensor Antenna on a Small UAV

    Publication Year: 2006, Page(s):74 - 78
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (367 KB) | HTML iconHTML

    On small platforms, angle-of-arrival (AOA) estimation of an E-M signal can be accomplished with colocated antennas measuring multiple components of the propagating wave. An electrically small vector sensor (VS) antenna constructed above and below the wing of a small UAV measures three components of the propagating wave. Determining the AOA involves fitting known "calibration" AOAs and correspondin... View full abstract»

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  • Multi-Channel Detection of Narcotics and Explosives using NQR Signals

    Publication Year: 2006, Page(s):79 - 83
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (277 KB) | HTML iconHTML

    A multi-channel detector for narcotics and explosives using nuclear quadrupole resonance (NQR) is developed. Multiple measurement coils are used to estimate the radio frequency interference that is often present. The temperature dependency of the NQR frequencies is incorporated in the detector, allowing for uncertainties in the temperature estimate of the sample. In addition, the detector consider... View full abstract»

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  • Programmable Processor Design for Givens Rotations based Applications

    Publication Year: 2006, Page(s):84 - 87
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (143 KB) | HTML iconHTML

    A wide range of applications involve matrix decompositions which can be computed using givens rotations. A programmable processor for givens rotations offers more flexibility than highly tailored systolic array hardware implementations. The programmable processor design presented in this paper employs an approximate rotations method to compute givens rotations. Instantiations of this programmable ... View full abstract»

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