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检索条件"主题词=Sparse array"

共 533 条记录，以下是81-90 订阅

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ABSOLUTE EIGENVALUES-BASED COVARIANCE MATRIX ESTIMATION FOR A sparse array 21

ABSOLUTE EIGENVALUES-BASED COVARIANCE MATRIX ESTIMATION FOR ...

引用

IEEE Statistical Signal Processing Workshop (SSP)

作者： Adhikari, Kaushallya Univ Rhode Isl Kingston RI 02881 USA

ISBN: (纸本)9781728157672

The ensemble covariance matrix of a wide sense stationary signal spatially sampled by a full linear array is positive semi-definite and Toeplitz. However, the direct augmented covariance matrix of an augmentable sparse array is Toeplitz but not positive semi-definite, resulting in negative eigenvalues that pose inherent challenges in signal direction estimation problems. The positive eigenvalues-based covariance matrix for augmentable sparse arrays is robust but the matrix is unobtainable when all noise eigenvalues of the direct augmented matrix are negative, which is a possible case. To address this problem, we propose a robust covariance matrix for augmentable sparse arrays that leverages both positive and negative noise eigenvalues. The proposed covariance matrix estimate can be used in conjunction with subspace based algorithms such as multiple signal classification or adaptive beamformers such as minimum variance distortionless response beamformer to yield accurate signal direction estimates.

关键词： Covariance matrix DOA estimation positive semi-definite sparse array Toeplitz

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Design of a Ka-Band sparse array Antenna for Spaceborne SAR Applications 47

Design of a Ka-Band Sparse Array Antenna for Spaceborne SAR ...

引用

47th European Microwave Conference (EuMC)

作者： Bekers, D. J. Jacobs, S. Bolt, R. J. Monni, S. Fortini, D. Germani, C. Capece, P. Toso, G. TNO Radar Technol The Hague Netherlands TAS I ActiveAntennas Rome Italy ESA ESTEC Antenna & Submillimeter Wave Noordwijk Netherlands

ISBN: (纸本)9782874870477

In this paper a novel sparse layout for the radiating aperture of a Ka-band spaceborne SAR is outlined. Starting from a set of typical requirements and the definition of a benchmark antenna, an approach to achieve sparsity (in terms of the number of active modules) is proposed, which reduces significantly the fill factor as compared to the benchmark array and at the same time maintains an acceptable level of complexity for manufacturing and testing. After an initial assessment of the radiation performance of the sparse layout, assuming isotropic radiators and ignoring mutual coupling, an actual design in slotted-waveguide technology is performed and an approach is devised to investigate the impact of mutual coupling on the radiation performance.

关键词： synthetic aperture radar phased array antenna sparse array

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TENSOR RECONSTRUCTION-BASED sparse array 2-D DOA ESTIMATION OF MIXED COHERENT AND UNCORRELATED SIGNALS 49

TENSOR RECONSTRUCTION-BASED SPARSE ARRAY 2-D DOA ESTIMATION ...

引用

49th IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Pavel, Saidur R. Zhang, Yimin D. Sun, Shunqiao de Almeida, Andre L. F. Temple Univ Dept Elect & Comp Engn Philadelphia PA 19122 USA Univ Alabama Dept Elect & Comp Engn Tuscaloosa AL 35487 USA Univ Fed Ceara Dept Teleinformat Engn Fortaleza Ceara Brazil

ISBN: (纸本)9798350344868;9798350344851

This paper addresses the direction-of-arrival (DOA) estimation problem of mixed coherent and uncorrelated signals using a sparse rectangular array, where tensor reconstruction is employed to preserve the structure of multi-dimensional array signals. In the proposed approach, we first estimate the DOAs of uncorrelated signals using the subspace algorithm. After eliminating the contribution of uncorrelated signals from the covariance tensor, a structural tensor decorrelation process is introduced to decorrelate the resulting coherent covariance tensor. The canonical polyadic decomposition method is employed to the decorrelated covariance tensor to detect the coherent signals. The conditions of signal resolvability are analyzed.

关键词： Direction of arrival estimation sparse array tensor decomposition Canonical polyadic decomposition mixed coherent and uncorrelated signals

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Multicast Directional Modulation Based On sparse array Optimization 17

Multicast Directional Modulation Based On Sparse Array Optim...

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17th IEEE International Wireless Communications and Mobile Computing Conference (IEEE IWCMC)

作者： Liu, Na-Ying Yang, Xin Sun, Wen-Bin Gong, Yan-Yun Wang, Ruofan Northwestern Polytech Univ Sch Elect & Informat Xian Peoples R China China Acad Launch Vehicle Technol Beijing Peoples R China

ISBN: (纸本)9781728186160

In recent years, the development of satellite communication is rapid, but the security problems become more significant. In this paper, from the perspective of improving the physical layer security, in the context of secure multicast transmission, we apply the sparse array directional modulation technology to improve the physical layer security. However, the inherent problem of sparse array is the existence of high sidelobe, which threatens the security of information transmission. Simulated annealing algorithm is used to optimize the selection of antenna subset, and some antenna combinations with high sidelobe are removed to obtain the optimized antenna subset codebook. When the distance between each ideal receiver and transmitter is different, the weighted simulated annealing algorithm method is introduced to allocate different transmission power to each receiver with different distance to improve the reception quality of each receiver. Finally, the simulation results verify the correctness of the above theory.

关键词： Satellite communication physical layer security sparse array directional modulation

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Optimum sparse array Configuration for Mismatched DOA on Moving Platforms

Optimum Sparse Array Configuration for Mismatched DOA on Mov...

引用

IEEE Radar Conference (RadarConf)

作者： Qin, Guodong Amin, Moeness G. Xidian Univ Sch Elect Engn Xian 710071 Shaanxi Peoples R China Villanova Univ Ctr Adv Commun Villanova PA 19085 USA

ISBN: (纸本)9781728189420

sparse arrays on a moving platform can efficiently expand the numbers of achievable degrees of freedom (DOFs) and consecutive lags, improving direction-of-arrival (DOA) estimation. This property has been recently used for the case of environment-independent structured sparse array configurations, such as those defined by nested and co-prime arrays. In this paper, we consider environment-dependent sparse arrays (EDSAs) design for mismatched DOA using Cramer-Rao bound (CRB) as the metric of optimality. The CRB is derived for multiple sources with angle biases. Two optimization metrics are considered, and solved by enumerations, to provide the optimum arrays. Simulation results are presented to validate the effectiveness of the proposed EDSA design.

关键词： sparse array moving platform sparse array design Cramer-Rao bound mismatched DOA

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Sea Trial Research on Multi-source Underwater Acoustic Image Measurement Technology Based on the sparse array

Sea Trial Research on Multi-source Underwater Acoustic Image...

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Washington State Conference and Trade Center (WSCTC)

作者： Mei, Jidan Sheng, Xueli Guo, Longxiang Yin, Jingwei Harbin Engn Univ Sci & Technol Underwater Acoust Lab Harbin 150001 Peoples R China

ISBN: (纸本)9781424443338

The underwater acoustic image measurement technology is a technology of passive acoustic localization in near field, which can get the track of moving target by measuring the main noise sources of the target through large scale array. Because of the complexity of underwater environment, it is difficult to lay a large high-accuracy half-wavelength array. Thus it is more convenient to use a sparse array in underwater acoustic image measuring. The sea trial research on the underwater acoustic image measurement based on the sparse array has been done to verify the feasibility of the method. The experiment result shows that using sparse array would lead to a series of interference fringes appearing in the image, but the interference fringes can be removed by frequency-division integrated technology. Three tracks measurement results of a catamaran are given. The results prove that the method is feasible.

关键词： acoustic imaging array signal processing frequency-division integrated technology multi-source underwater acoustic image measurement technology passive acoustic localization sea trial research sparse array underwater sound

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Broadband Wide Beam Dual Polarization Antenna Unit and Its sparse array 12

Broadband Wide Beam Dual Polarization Antenna Unit and Its S...

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12th International Symposium on Antennas, Propagation and Electromagnetic Theory (ISAPE)

作者： Jin, Xiongjie Wang, Shuoguang Liu, Youwei Beijing Inst Technol Beijing Key Lab Millimeter Wave & Terahertz Tech Beijing Peoples R China

ISBN: (纸本)9781538673027

This paper presents a new type of wide-bandwidth beam antenna, which uses a relatively new type of cross-type microstrip dipole. This form has a wider -3dB beamwidth than ordinary microstrip antennas. The radiation profile uses a gradation profile and widens the bandwidth of the antenna by adding parasitic structures and increasing the air frame height. Antenna structure parameters are optimized using ANSYS HFSS. What the test results display is that the 1 port and 2 port standing wave's relative bandwidth <-7.5dB of designed antenna unit reach 35.9% and 22.8%, the central frequency E-plane and H-plane beam width are 110 degrees and 91 degrees, respectively, which facilitates large-angle scanning. This antenna is an orthogonal two-line polarized antenna with a zenith-directional line polarization cross-polarization level of - 19.55 dB. With the help of software Matlab, we use sparse Focuss algorithm obtain the antenna array composed of 64 units. The gain reaches 19.61dB when the scanning angle is 60 degrees. It was verified that this antenna element and sparse array have good characteristics.

关键词： broadband wide beam dual polarization sparse array scanning angle

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Efficient Storage Scheme for n-Dimensional sparse array: GCRS/GCCS 13

Efficient Storage Scheme for n-Dimensional Sparse Array: GCR...

引用

International Conference on High Performance Computing and Simulation (HPCS)

作者： Shaikh, Md Abu Hanif Hasan, K. M. Azharul Khulna Univ Engn & Technol Comp Sci & Engn Dept Khulna 9203 Bangladesh

ISBN: (纸本)9781467378130

Degree of data sparsity increases with the increase of number of dimensions in high performance scientific computing. Storing and applying operations on this highly sparse multidimensional data is still a challenge for data scientists. Experts suggest special storage scheme over sparse array. In traditional sparse array storage scheme, (n+l) one dimensional arrays are necessary to store n-dimensional array. In this paper, we propose 'Generalized Row/Column Storage (GCRS/GCCS)' scheme which requires three one dimensional arrays only for storing a n-dimensional array. The superiority of the GCRS/GCCS over traditional Compressed Row/Column Storage (CRS/CCS) is shown by both theoretical analysis and experimental results. In theoretical analysis, we derive equations for space and time complexity as well as the range of usability for GCRS/GCCS. It is shown that the GCRS/GCCS scheme yields to support minimum 50% data density where as the range of usability is inversely proportional with the number of dimensions for CRS/CCS scheme. The experimental result shows that the proposed GCRS/GCCS scheme outperforms the CRS/CCS scheme with respect to space complexity, time complexity and range of usability.

关键词： sparse array Multidimensional array array Storage array Compression High Performance Computing array operations CRS CCS

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A Symmetric sparse array Direction Of Arrival Estimation 6

A Symmetric Sparse Array Direction Of Arrival Estimation

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6th IEEE International Women in Engineering (WIE) Conference on Electrical and Computer Engineering (WIECON-ECE)

作者： Raiguru, Priyadarshini Panda, Dhruba Charan Mishra, Rabindra Kishore S O A Deemed Univ Elect & Commun Engn Bhubaneswar India Berhampur Univ Elect Sci & Technol Berhampur India

ISBN: (纸本)9781665419178

A symmetric sparse array (SSA), recursively generated, followed by Cantor set is analyzed for direction finding. Like Many sparse arrays with non-uniform spacing, it detect more uncorrelated sources i.e. Degree Of Freedom (DOF). The properties such as maximally economic, hole-free, systematic and symmetric array configuration attract the use of this sparse array in some practical implementation. This paper analyzes the DOA estimation performances using this SSA both in ideal and non-idealities conditions. Various numerical simulations demonstrate better performance of SSA with reduced mutual coupling effect.

关键词： direction of arrival fractal array mutual coupling sparse array

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OPTIMUM sparse array DESIGN FOR MAXIMIZING SIGNAL-TO-NOISE RATIO IN PRESENCE OF LOCAL SCATTERINGS

OPTIMUM SPARSE ARRAY DESIGN FOR MAXIMIZING SIGNAL-TO-NOISE R...

引用

IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

作者： Hamza, Syed A. Amin, Moeness G. Fabrizio, Giuseppe Villanova Univ Ctr Adv Commun Villanova PA 19085 USA Def Sci & Technol Grp Edinburgh SA 5111 Australia

ISBN: (纸本)9781538646588

Optimum sparse array design for maximum output signal-to-noise ratio (MaxSNR) and signal-to-interference ratio (MaxSINR) have been shown to yield significant performance improvement compared to random or environmental-independent structured arrays, with the same number of antennas. We examine the MaxSNR problem in presence of local scatterings which may follow specific deterministic or statistical scattering models. It is shown that if the scatterers assume a Gaussian distribution centered around the source angular position, the optimum array configuration for maximizing the SNR is the commonly used uniform linear array (ULA). If the scatterers circulate the source, the optimum design yields sparse array topologies with superior performance over ULAs. Simulation results are presented to show the effectiveness of array configurability in the case of both Gaussian and circularly spread sources.

关键词： MaxSNR MaxSINR ULA sparse array Gaussian distribution circularly spread sources

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