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Performance of DCMP adaptive array utilizing aggregated microphones

Performance of DCMP adaptive array utilizing aggregated micr...

引用

4th ieee sensor array and multichannel signal processing workshop

作者： Matsumoto, M. Hashimoto, S. Waseda Univ Dept Appl Phys Shinjuku Ku 55N-4F-10A3-4-1 Okubo Tokyo Japan

ISBN: (纸本)1424403081

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： Microphones

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Threshold optimization for distributed detection using particle filtering methods

Threshold optimization for distributed detection using parti...

引用

4th ieee sensor array and multichannel signal processing workshop

作者： Kyriakides, I. Cochran, D. Arizona State Univ Dept Elect Engn Tempe AZ 85287 USA

ISBN: (纸本)1424403081

Local processing on the nodes of a distributed sensing and processing system has the benefits of reducing the data volume transferred from the nodes to the fusion center, reducing both transmission power requirements and the computational burden on the fusion center. The individual nodes obtain measurements from the environment and transmit a quantized detection statistic to the fusion center. Quantization threshold levels need to be found for each sensor that maximize the performance of the system. We propose a global optimization method, the particle filtering optimization method, that uses particle filtering to propagate the values of the thresholds of a distributed detection system to sensor threshold values that are optimal with respect to some measure of system performance. We demonstrate, through simulations, the effectiveness of the particle filtering optimization method in finding the threshold of each of the sensors used in detection scenario.

关键词： sensor arrays

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Real-time implementation of a distributed voice activity detector

Real-time implementation of a distributed voice activity det...

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4th ieee sensor array and multichannel signal processing workshop

作者： Berisha, Visar Kwon, Hornin Spanias, Andreas Arizona State Univ Dept Elect Engn Tempe AZ 85287 USA

ISBN: (纸本)1424403081

Wireless sensor networks have been applied successfully in real-time distributed and collaborative sensing. In these situations, each sensor is responsible for extracting pertinent information from the surrounding environment and transmitting it to other sensors and/or to the main processing station. This is done while operating under several constraints, such as low computational capabilities, limited arithmetic precision, and the need to conserve power. In this paper, we present a low-complexity voice activity detector and a gender classifier for implementation on the Crossbow sensor motes. In addition, a decision fusion algorithm that resides at the base station is also implemented. A series of experiments that characterize the performance of the algorithms under varying conditions and in different environments are presented and several of the challenges we faced in developing this real-time implementation are discussed.

关键词： Speech processing

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A multisource calibration method for phased array radio telescopes

A multisource calibration method for phased array radio tele...

引用

4th ieee sensor array and multichannel signal processing workshop

作者： Wijnholds, Stefan J. Boonstra, Albert-Jan ASTRON Oude Hoogeveensedijik 4 NL-7991 PD Dwingeloo Netherlands

ISBN: (纸本)1424403081

For low frequency observations (< 300 MHz) the radio astronomical community is currently developing a number of new instruments such as the low frequency array (LOFAR), the Mileura wide field array (MWA) and the primeval structure telescope (PaST). These telescopes require new calibration algorithms since phased arrays require an all-sky approach to imaging and calibration. This implies that the calibration will generally have to deal with a multitude of sources. In this paper we will discuss a muldsource calibration method to estimate the gains and phases of the receiving elements without having to solve for the receiver noise powers at the same time. Our method is able to handle arbitrary known source models. We will show that the proposed algorithm is asymptotically efficient by comparing the results from Monte Carlo simulations with the Craimer-Rao bound for the underlying data model.

关键词： Radio telescopes

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Direction-finding results for a Vector sensor Antenna on a small UAV

Direction-finding results for a Vector Sensor Antenna on a s...

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4th ieee sensor array and multichannel signal processing workshop

作者： Appadwedula, Swaroop Keller, Catherine M. MIT Lincoln Lab 244 Wood St Lexington MA 02173 USA

ISBN: (纸本)1424403081

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 corresponding antenna response to a modeled response. The least-squares calibration approach described here determines the azimuth and elevation AOAs for sources located at typical elevation angles to within a few degrees, agreeing with the Cramer-Rao Lower Bound (CRLB). These results justify the use of small VS antennas to do direction finding (DF) in high SNR environments.

关键词： Direction of arrival

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Development of a multi-dimensional SVD based technique for multi-receivers ultrasound used in bone status characterization

Development of a multi-dimensional SVD based technique for m...

引用

4th ieee sensor array and multichannel signal processing workshop

作者： Sasso, Magali Talmant, Maryline Haiat, Guillaume Laugier, Pascal Naili, Salah Univ Paris 12 Mecan Phys Lab CNRS UMR 7052 B2OA Creteil France Univ Pierre Marie Curie Paris 6 CNRS UMR 7623 Lab Imagerie Parametrique Paris France

ISBN: (纸本)1424403081

The use of multi-dimensional wave extraction algorithm for a multi-receivers axial transmission ultrasound device used in bone evaluation is proposed. As far as we know, multidimensional signal processing techniques have never been implemented in this configuration. A SVD-based wave-front extraction is implemented for the characterization of an energetic low frequency contribution. Velocity accuracy is estimated on a synthetic dataset. Furthermore, the energetic low frequency removal is illustrated on in vivo signals. Results are promising as for the application of multidimensional techniques in medical ultrasound used in transmission.

关键词： Ultrasonic devices

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Application of 2D-direction locked loop tracking algorithm to mobile satellite communications

Application of 2D-direction locked loop tracking algorithm t...

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4th ieee sensor array and multichannel signal processing workshop

作者： Gieron, Roman Siatchoua, Patrice IMST GmbH Carl Friedrich Gauss Str 2 D-47475 Kamp Lintfort Germany

ISBN: (纸本)1424403081

Mobile satellite terminals especially with high-gain antenna require fast and accurate beam tracking algorithms for communication. The main topic of this paper is the extension of a tracking algorithm to mobile satellite communications, its implementation and performance. The presented considerations and simulation results concern low SNR condition and narrow antenna beam configuration as existing in satellite communications. The assumed satellite is geostationary. The work is presented in context of SANTANA-2 project, (Smart Antenna Terminal), founded and supported by the German DLR on behalf of BMBF. The realized terminal uses an antenna array in Ka-band and fully implements Digital BeamForming (DBF) to control the beam pointing direction and the antenna beam shape.

关键词： tracking algorithm antenna array array signal processing mobile satellite communications digital beamforming Ka-band

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Projection techniques for separation of multiple Secondary Surveillance Radar sources in a real environment

Projection techniques for separation of multiple Secondary S...

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4th ieee sensor array and multichannel signal processing workshop

作者： Petrochilos, N. Galati, G. Piracci, E. Univ Reims CReSTIC Moulins HousseBP 1039 F-51687 Reims 2 France Univ Roma Tor Vergata Disp & V Volterra Ctr I-00133 Rome Italy

ISBN: (纸本)1424403081

Secondary Surveillance Radar (SSR) based on multilateration principle and omni-directional antennae are operational today [1, 2]. We proposed new algorithms to separate a mixture of overlapping SSR replies on a M-elements antenna in previous works [3, 4], other solutions were also proposed in the literature [5, 6, 7]. Unfortunately, all have either some shortcomings, or an expensive computational cost, or no simple practical implementation. Therefore, there is a need for reliable, simple, effective algorithms to separate multiple SSR signals. Real recorded signals in a live environment are used to demonstrate the effectiveness of the proposed techniques.

关键词： Surveillance radar

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Blind timing synchronization for OFDM systems via adaptive beamforminga

Blind timing synchronization for OFDM systems via adaptive b...

引用

4th ieee sensor array and multichannel signal processing workshop

作者： Yang, Kehu He, Xueyao Xidian Univ EE Res Inst S Taibai Rd 2 Xian 710071 Peoples R China

ISBN: (纸本)1424403081

It is known that blind timing synchronization of OFDM systems can be realized for AWGN channels using the redundant information of cyclic prefix. In this paper, we extend the blind method to the case of array receivers via adaptive beamforming, and a new approach is proposed to improve the synchronization accuracy for high data rate OFDM systems, where rich multipath rays are present. The extended method is to coherently combine the desired signals of array receivers and suppress the undesired signals using adaptive beamforming. And the approach is to reduce the effect of multipath rays on synchronization. Simulation results show that in rich multipath scenarios the approach works effectively both in the absence and the presence of carrier frequency offset.

关键词： Blind source separation

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Beam raster scanning for 2D flyover SAR

Beam raster scanning for 2D flyover SAR

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4th ieee sensor array and multichannel signal processing workshop

作者： Burki, Jehanzeb Barnes, Christopher F. Georgia Inst Technol Dept Elect & Comp Engn Atlanta GA 30332 USA

ISBN: (纸本)1424403081

Synthetic Aperture Radar (SAR) imaging technology has continued to evolve over the last few decades and the future holds promise. Beam raster scanning for 2D flyover SAR is yet another milestone in the evolutionary path of SAR imaging. This SAR imaging technique may have application in areas like passive unmanned aerial vehicle SAR. This paper builds on the 2D aperture synthesis concepts based upon rigorous analytical results presented by the authors earlier and elucidates the characteristics of sombrero point spread function and reconstruction in comparison to sine point spread function and reconstruction. This paper also explains the concept of 2D target area data collection scheme called flyover beam raster scanning.

关键词： Synthetic Aperture Radar (SAR) 2D aperture synthesis Stolt interpolation passive SAR range cross-range beam raster scan

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