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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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One-side Extended Nested array for Degree of Freedom Enhancement 11

One-side Extended Nested Array for Degree of Freedom Enhance...

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

作者： Ren, Shiwei Dong, Wentao Li, Xiangnan Yan, Su Wu, Haixia Wang, Weijiang Beijing Inst Technol Dept Signal & Elect Beijing Peoples R China

ISBN: (纸本)9781728119465

In this paper, an extended nested array strategy is proposed for degree of freedom (DOF) enhancement. Based on the augmented nested array (ANA), with the inter-element spacings in the side subarray increased, the strategy provides the possibility to acquire higher number of DOF than the existing nested-like arrays, such as the nested array, ANA, improved nested array and the maximum inter-element spacing constraint array. The one-side extended nested array (OS-ENA) is specifically proposed based on the ENA strategy, which can successfully avoid the holes brought by the sparse distribution of sensors and increase the DOF. The analytical expressions of sensor locations and DOF are derived. Simulations of the direction-of-arrival estimation verify the superiorities of the proposed OS-ENA with the spacial smoothing MUSIC algorithm used.

关键词： DOA estimation Degree of freedom Sparse nested array

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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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2-D sensor position perturbation analysis: Equivalence to AWGN on array outputs

2-D sensor position perturbation analysis: Equivalence to AW...

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2nd ieee sensor array and multichannel signal processing workshop

作者： Cevher, V McClellan, JH Georgia Inst Technol Atlanta GA 30332 USA

ISBN: (纸本)0780375513

In this paper, the performance of a subspace beamformer, namely the multiple signal classification algorithm (MUSIC), is scrutinized in the presence of sensor position errors. Based on a perturbation model, a relationship between the array autocorrelation matrix and the source autocorrelation matrix is established. It is shown that under certain assumptions on the source signals, the Gaussian sensor perturbation errors can be modelled as additive white Gaussian noise (AWGN) for an array where sensor positions are known perfectly. This correspondence can be used to equate position errors to an equivalent signal-to-noise ratio (SNR) for AWGN in performance evaluation. Finally, Cramer-Rao bound for the position perturbations that can be computed using the Cramer-Rao bound relations for the additive Gaussian noise case at high SNR's.

关键词： signal to noise ratio

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Random Switch Antenna array FMCW Radar and Its signal processing Method

Random Switch Antenna Array FMCW Radar and Its Signal Proces...

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

作者： Hu, Chenxi Meng, Huadong Wang, Wei Li, Gang Wang, Xiqin Tsinghua Univ Dept Elect Engn Beijing 100084 Peoples R China Xian Elect Engn Res Inst Xian Peoples R China

ISBN: (纸本)9781467310710

In this paper, random switch antenna array (RSAA) is proposed to apply to the switch antenna array (SAA) frequency-modulated continuous-wave (FMCW) radar system. Firstly, the signal model and signal processing method of RSAA is analyzed and it shows that RSAA can successfully solve azimuth-velocity coupling problem. Then we suppose a method by using RSAA to reduce the switching frequency and sampling rate based on sparse signal representation with multiple measurement vectors (MMV). It is shown in simulations that the proposed algorithms yield better performance in terms of azimuth-velocity decoupling and can obtain high image accuracy with less observation data.

关键词： FMCW Radar Time-division multiplexing antenna array RSAA Azimuth-velocity coupling M-FOCUSS

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Enhanced DOA Estimation Exploiting Multi-Frequency Sparse array

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ieee TRANSACTIONS ON signal processing 2021年 69卷 5935-5946页

作者： Zhang, Shuimei Ahmed, Ammar Zhang, Yimin D. Sun, Shunqiao Temple Univ Dept Elect & Comp Engn Philadelphia PA 19122 USA Univ Alabama Dept Elect & Comp Engn Tuscaloosa AL 35487 USA

In this paper, we develop a general framework of multi-frequency sparse array to estimate the direction-of-arrival (DOA) of a significantly higher number of targets than the number of physical sensors. The multi-frequency sparse arrays are designed to offer zero lag redundancy in the rendered difference coarray so that the available degrees of freedom are fully utilized to enable high-resolution DOA estimation. A modified sensor interpolation technique is developed to accurately estimate the signal correlation matrix so that the effect of holes in the difference coarray is mitigated. The proposed technique accounts for both self-lags between signals corresponding to the same frequencies and the cross-lags between signals corresponding to different frequencies. As such, it enhances the DOA estimation performance compared to existing methods that either perform array interpolation utilizing only the self-lags or carry out group sparse reconstruction without exploiting array interpolation. Simulation results verify the offerings of the multi-frequency sparse arrays.

关键词： sensor arrays array signal processing Estimation Direction-of-arrival estimation Correlation Sparse matrices Redundancy array interpolation direction-of-arrival estimation multi-frequency sparse array zero lag redundancy group sparsity

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An extended ambiguity criterion for array design

An extended ambiguity criterion for array design

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2nd ieee sensor array and multichannel signal processing workshop

作者： Dowlut, N Motorola Canada Toronto Design Ctr Markham ON L6G 1B3 Canada

ISBN: (纸本)0780375513

The ambiguity problem in direction-of-arrival (DOA) estimation using a sensor array, manifests itself as spurious peaks in the DOA spectrum, making the true targets indistinguishable from the false alarms. A criterion that determines the presence of certain ambiguities inherent to a symmetric linear array was proposed in the literature. The criterion is a useful tool to design reliable sensor arrays. In this paper, a generalization of this ambiguity criterion is presented. The new ambiguity criterion encompasses more ambiguous DOAs and therefore gives a more accurate measurement of the reliability of an array design.

关键词：

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BEAM PATTERN SYNTHESIS FOR CONFORMAL array WITH SIDELOBE AND POLARIZATION CONTROL: A PENALIZED INEQUALITY APPROACH 11

BEAM PATTERN SYNTHESIS FOR CONFORMAL ARRAY WITH SIDELOBE AND...

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

作者： Gao, Tianyu Pu, Wenqiang Zhang, Pengyu Luo, Zhi-Quan Chinese Univ Hong Kong Shenzhen Res Inst Big Data Shenzhen Peoples R China China Elect Technol Grp Corp Beijing Peoples R China

ISBN: (纸本)9781728119465

Conformal array is attractive due to its flexibility to attach to different shape of surface. However, beam pattern synthesis for conformal array to control power side lobes and different polarization components for two dimensional angle space is a challenge, especially the degree of freedom is limited. In this work, we propose a robust beam pattern synthesis formulation for conformal array based on constrained convex optimization. By penalizing the maximum gain of cross-polarization component levels, power side lobes and different polarization components are controlled in a manner that the number of constraints is no longer limited by the array DoF. The proposed formulation is a convex second-order cone programming, a computationally efficient algorithm based on the alternating directions of multipliers method is designed to solve it. Simulations demonstrate the effectiveness of the proposed formulation to synthesize a desired pattern with robustness.

关键词： array signal processing beamforming convex optimization

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AN ALTERNATING MINIMIZATION APPROACH TO OPTIMIZING SUBarray CONFIGURATION FOR A LARGE PHASED array 10

AN ALTERNATING MINIMIZATION APPROACH TO OPTIMIZING SUBARRAY ...

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

作者： Pu, Wenqiang Yu, Yong Yu, Shuhua Luo, Zhi-Quan Xidian Univ Natl Lab Radar Signal Proc Xian Shaanxi Peoples R China China Elect Technol Grp Corp Beijing Peoples R China Chinese Univ Hong Kong Shenzhen Res Inst Big Data Shenzhen Peoples R China

ISBN: (纸本)9781538647523

A large size phased array is a powerful system for surveillance, but must be appropriately decomposed as subarrays for efficient digital beamforming. One fundamental question is how to configure a large array as subarrays to satisfy various signal processing requirements. This work deals with two basic signal processing tasks, synthesizing multiple beams at subarray level and adaptively suppressing multiple interferences. Two optimization criteria to jointly design subarray configuration and digital weights for subarrays are proposed. To handle the large number of variables in the optimization formulations, we propose an alternating minimization approach with low computation cost. Numerical simulations are presented to demonstrate the effectiveness of the proposed algorithm.

关键词： Phased array subarray beamforming alternating optimization

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A new beamformer based on phase dispersion to improve 2D sparse array response

A new beamformer based on phase dispersion to improve 2D spa...

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

作者： Martinez-Graullera, Oscar Romero-Laorden, David Ibanez, Alberto Ullate, Luis G. CAEND UPM CSIC Madrid 28006 Spain

ISBN: (纸本)9781467310710

This work studies a new beamformer for non-periodic sparse bidimensional ultrasonic array transducer. It is based on a weighting factor based on signals phase dispersion to enhance the image points where the phase coherence between the received signals is high. A method to measure the phase dispersion based on Fourier analysis and its integration in the beamformer are presented. Its performance is evaluated using a non-periodic 2D sparse array based on Fermat spiral with 96 elements and a diameter of 60 lambda. Compared with conventional Delay-And-Sum beamformer the proposed solution reduces the aperture lateral resolution and improves its dynamic range, achieving up to 50dB of contrast in the image and less 1 degrees in lateral resolution.

关键词： Fourier analysis

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