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检索条件"任意字段=2nd IEEE Sensor Array and Multichannel Signal Processing Workshop"

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Design of 2-dimension sparse arrays using an improved genetic algorithm

Design of 2-dimension sparse arrays using an improved geneti...

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4th ieee sensor array and multichannel signal processing workshop

作者： Chen, Kesong He, Zishu Han, Chunlin Univ Elect Sci & Technol China Sch Elect Engn Chengdu Dichuan Peoples R China

ISBN: (纸本)1424403081

For the element position synthesis of 2-dimension sparse rectangular arrays with the design constraints of the number of elements, the aperture and the minimum element spacing, an improved genetic algorithm (IGA) based on chromosome element resetting is presented in this paper. Compared with the synthesis method of thinned arrays, this new approach could exploit more degree of freedom of elements to control the characters of the sparse arrays. When the aperture, the number of elements and the minimum element spacing are fixed identical, the new approach can make the sparse plane array produce lower peak sidelobe level (PSLL). The simulated results show that the fitness function value of thinned plane arrays with 108 elements mentioned by Haupt can reduce 5.626dB when the minimum element spacing of half wavelength was introduced into the optimization. And as well, the great efficiency and the robustness of IGA are shown in this paper.

关键词： array processing

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Study of the Human Eye Working Principle: An impressive high angular resolution system with simple array detectors

Study of the Human Eye Working Principle: An impressive high...

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4th ieee sensor array and multichannel signal processing workshop

作者： Betancourt, Diego del Rio, Carlos Univ Publ Navarra Antenna Grp Campus Arrosadia S-N Pamplona 31006 Spain

ISBN: (纸本)1424403081

In this paper the working principle of the human eye is studied since uses very simple detectors, cones and rods, to provide an impressive high angular resolution without using any kind of scanning technique. Usually the resolution capability of the human eyes has been attributed to the complexity of the brain, but it is quite difficult to understand that something, specially small details, that it has not been seen by the eyes could be generated by the brain. Finally, it will be proved that with the actual technology and design philosophy of array antenna systems, the maximum achievable angular resolution of a realistic antenna array system is seriously limited and it is equivalent to the one that it could have an insect with compound eyes. It is clear the human eye is able to overcome this limit, and the idea is to learn how to introduce this to the design procedure of antenna array systems.

关键词： Vision

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A multisource calibration method for phased array radio telescopes

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

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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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Energy Detection for Decision Fusion in Wireless sensor Networks over Ricean-Mixture Fading

Energy Detection for Decision Fusion in Wireless Sensor Netw...

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

作者： Salvo Rossi, Pierluigi Ciuonzo, Domenico Ekman, Torbjoern Kansanen, Kimmo Univ Naples 2 Dept Ind & Informat Engn Naples Italy Norwegian Univ Sci & Technol Dept Elect & Telecommun Trondheim Norway

ISBN: (纸本)9781479914814

In this paper we focus on the energy detector for decision fusion in wireless sensor networks over multiple access channels. More specifically, we derive analytical performance in terms of global probability of false alarm and detection (including asymptotic performance for large number of sensors) when the fading is a Ricean mixture, i.e. channel coefficients are sampled from a Gaussian mixture (GM) distribution. The motivation for the GM is the ability to model real-world scenarios while keeping mathematical tractability. Analytical results are confirmed through numerical simulations.

关键词： Wireless sensor networks energy detector fading color Channel Coefficient probability of false alarm Fusion reactions Fusion, biological FUSION fusion (melting) Multiple Access Channel

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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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DOA Estimation by Two-Dimensional Interpolation in the Presence of Mutual Coupling 11

DOA Estimation by Two-Dimensional Interpolation in the Prese...

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

作者： Liu, Qi Cao, Hui Wu, Yuntao Huang, Changhai Natl Univ Singapore Dept Elect & Comp Engn Singapore Singapore Wuhan Univ Technol Sch Informat Engn Wuhan Peoples R China Wuhan Inst Technol Sch Comp Sci & Engn Wuhan Peoples R China Shanghai Maritime Univ Merchant Marine Coll Shanghai Peoples R China

ISBN: (纸本)9781728119465

In mobile communication, mutual coupling between array elements will affect the estimation performance of the existing direction of arrival (DOA) estimators. To tackle this problem, an accurate DOA estimation method for coprime array is developed, where the effect of mutual coupling is eliminated by the banded complex symmetric Toeplitz matrix, and further weakened via two-dimensional (2-D) interpolation. The accuracy of the proposed algorithm is verified by the simulation results in comparison of several DOA estimation approaches as well as Cramer-Rao lower bound (CRLB).

关键词： Direction of arrival estimation mutual coupling array signal processing coprime array two-dimensional interpolation

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Multiple window bispectrum estimator

Multiple window bispectrum estimator

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4th ieee sensor array and multichannel signal processing workshop

作者： He, Huixia Thomson, David J. Queens Univ Kingston ON K7L 3N6 Canada

ISBN: (纸本)1424403081

By taking the third-order statistical information of processes into account, the bispectrum is a useful tool in digital signal processing and statistics. The paper proposes a nonparametric approach of estimating the bispectrum, using tapers designed to achieve maximal bifrequency concentration. Bispectra are functions of two frequencies plus their sum, so the optimum tapers are not products of Slepian sequences. The new tapers minintize the sixth-moment "energy" leakage in the estimate, and thus the new multiple window bispectrum estimator (MWBE) can be interpreted as minimizing the broad-band bias. Alternatively, the MWBE can be viewed as a solution of an integral inverse problem using an eigenfunction expansion. This approach can be extended to estimate higher-order polyspectra. Numerical simulations use moving average (MA) data with non-Gaussian white driving noise. Simulation results with small sample sizes show that this new MWBE is feasible and mean-squared error (MSE) optimal.

关键词： Digital signal processing

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Throughput of large wireless networks on square, hexagonal and triangular grids

Throughput of large wireless networks on square, hexagonal a...

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4th ieee sensor array and multichannel signal processing workshop

作者： Hong, Kezhu Hua, Yingbo Univ Calif Riverside Dept Elect Engn Riverside CA 92521 USA

ISBN: (纸本)1424403081

Capacity analysis of sensor networks or wireless ad hoc networks has attracted a great attention in the past years. But the research in this area has primarily focused on scaling laws of arbitrary or random network instead of the exact capacity of given topologies. While the insight into how the capacity of an arbitrary or random network scales with the number of nodes in a given area is important, the exact capacity of a network depends on the network topology and can be more desirable in practice. In this paper, we compare the throughput of a large network with three possible topologies: square (rectangular), hexagonal and triangular. With a given topology, the network throughput also depends on the choice of routing protocols. We follow a synchronous array method (SAM) that is known so far to yield the highest throughout of a network on a rectangular grid.

关键词： Wireless sensor networks

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Target Detection Based on Canonical Correlation Technique for Large array MIMO Radar in Spatially Correlated Noise 11

Target Detection Based on Canonical Correlation Technique fo...

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

作者： Zhou, Meihan Jiang, Hong Dong, Siyan Jilin Univ Coll Commun Engn Changchun 130012 Peoples R China

ISBN: (纸本)9781728119465

A novel target detection algorithm for large array multi-input multi-output (MIMO) radar in spatially correlated noise is proposed in this paper using canonical correlation technique (CCT). In the signal model, two separate sub-arrays are employed as the receive array of a transmit diversity MIMO radar system. Assume that the elementary noise in each sub-array has spatial correlation, and the number of receive elements is large and grows as the same rate with the snapshots. The detection statistics is constructed based on the generalized likelihood ratio test (GLRT) criterion and the sample canonical correlation coefficient between the two sub-arrays. The expression of decision threshold is derived via the Tracy-Widom distribution of order 2 in random matrix theory. The simulation results show that the detection performance of the proposed algorithm is better than that of the conventional condition number (CN)-based algorithm in the presence of spatially correlated noise and large array.

关键词： MIMO radar target detection canonical correlation spatially correlated noise random matrix theory

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Statistical Angular Resolution Limit for array Radar with Ultrawideband Stochastic signals

Statistical Angular Resolution Limit for Array Radar with Ul...

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

作者： Zhou, Xiaoli Wang, Hongqiang Cheng, Yongqiang Qin, Yuliang Chen, Haowen Sun, Bin Natl Univ Def Technol Sch Elect Sci & Engn Changsha 410073 Hunan Peoples R China

ISBN: (纸本)9781479914814

The 2-D angular resolution limit for array radar with ultrawideband (UWB) stochastic signals based on the statistical resolution theory is presented in this paper. The signal model of monostatic array radar with circular array configuration and UWB stochastic signals is established, while the resolution of two closely spaced targets is modelled as a binary hypothesis test. The statistical angular resolution limit (SARL) for array radar with UWB stochastic signals is derived based on the generalized likelihood ratio test (GLRT) with given probabilities of false alarm and detection. The effects of detection parameters, transmit waveforms, array geometry, signal-to-noise ratio and parameters of target on SARL are analysed. Compared with the conventional resolution defined by ambiguity function, the SARL reflects the practical resolution ability of radar and can provide an optimization criterion for radar system design.

关键词： array radar Ultra wideband technologies ANGULAR RESOLUTION resolution limit optimal criterion signals Resolving power Stochastic False alarms

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