检索结果-内蒙古大学图书馆

Sigma-Delta Beamformer DOA Estimation for distributed array Radar

IEICE TRANSACTIONS ON COMMUNICATIONS 2022年第12期E105B卷 1589-1599页

作者： Ito, Toshihiro Matsuda, Shoji Kasahara, Yoshiya Mitsubishi Electr Corp Informat Technol R&D Ctr Kamakura Kanagawa 2478501 Japan Kanazawa Univ Grad Sch Nat Sci & Technol Kanazawa Ishikawa 9201192 Japan Mitsubishi Electr Corp Commun Syst Ctr Amagasaki Hyogo 6618661 Japan Kanazawa Univ Emerging Media Initiat Kanazawa Ishikawa 9201192 Japan

distributed array radars consist of multiple sub-arrays separated by tens to hundreds of wavelengths and can match narrow beamwidths with large-aperture, high-gain antennas. The physical independence of the sub-arrays contributes to significant structure flexibility and is one of the advantages of such radars. However, a typical problem is the grating lobes in the digital beam forming (DBF) beam pattern. Unfortunately, the need to suppress the generation of grating lobes makes the design of acceptable sub-array arrangements very di fficult. A sigma-delta beam former direction of arrival (DOA) estimation method is proposed in this study to solve this problem. The proposed method performs DOA estimation by acquiring the difference signals in addition to the sum signals of all sub-arrays. The difference signal is typically used for monopulse DOA estimation in the phased array radar. The sigma-delta beamformer simultaneously has both advantages of DOA estimations using a distributed array with a large aperture length and using a sub-array that is not affected by the grating lobe. The proposed method can improve the DOA estimation accuracy over the conventional method under grating lobe situations and help the distributed array radar achieve flexibility in the sub-array arrangement. Numerical simulations are presented to verify the effectiveness of the proposed DOA estimation method.

关键词： radar distributed array DOA estimation beamformer monopulse

来源：评论

学校读者我要写书评

暂无评论

Pattern Synthesis of the distributed array Based on the Hybrid Algorithm of Particle Swarm Optimization and Convex Optimization 11

Pattern Synthesis of the Distributed Array Based on the Hybr...

引用

11th International Conference on Natural Computation (ICNC) / 12th International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Ma, Shoulei Li, Hailin Cao, Aihua Tan, Jing Zhou, Jianjiang Nanjing Univ Aeronaut & Astronaut Coll Elect & Informat Engn Nanjing Jiangsu Peoples R China

ISBN: (纸本)9781467376792

To solve the high peak side-lobe level of the distributed array, a hybrid optimization method of particle swarm optimization and convex optimization is proposed in this paper. With the peak side-lobe level as the objective function, the particle swarm optimization is considered as a global optimization algorithm to optimize the elements' positions while the convex optimization is considered as a local optimization algorithm to optimize the elements' weights. In this algorithm, the reducing of the variables' dimensions and the complete match of positions and weights for every particle improve the optimal performance effectively. The results show that for a distributed linear array, the algorithm proposed in this paper can obtain a lower peak side-lobe level under the constraint of main lobe width and limited number of array elements. The better performance of pattern synthesis demonstrates the effectiveness of the algorithm.

关键词： distributed array particle swarm optimization convex optimization peak side-lobe level

来源：评论

学校读者我要写书评

暂无评论

NEURAL NETWORK-BASED COMPRESSION FRAMEWORK FOR DOA ESTIMATION EXPLOITING distributed array 47

NEURAL NETWORK-BASED COMPRESSION FRAMEWORK FOR DOA ESTIMATIO...

引用

47th IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

作者： Pavel, Saidur R. Zhang, Yimin D. Temple Univ Dept Elect & Comp Engn Philadelphia PA 19122 USA

ISBN: (纸本)9781665405409

distributed array consisting of multiple subarrays is attractive for high-resolution direction-of-arrival (DOA) estimation when a large-scale array is infeasible. To achieve effective distributed DOA estimation, it is required to transmit information observed at the subarrays to the fusion center, where DOA estimation is performed. For noncoherent data fusion, the covariance matrices are used for subarray fusion. To address the complexity involved with the large array size, we propose a compression framework consisting of multiple parallel encoders and a classifier. The parallel encoders at the distributed subarrays are trained to compress the respective covariance matrices. The compressed results are sent to the fusion center where the signal DOAs are estimated using a classifier based on the compressed covariance matrices.

关键词： Direction-of-arrival estimation distributed array distributed sensing data compression neural network

来源：评论

学校读者我要写书评

暂无评论

DOA Estimation Exploiting distributed array with Arbitrary Subarray Orientations

DOA Estimation Exploiting Distributed Array with Arbitrary S...

引用

IEEE Radar Conference (RadarConf)

作者： Zhang, Yimin D. Chowdhury, Md Waqeeb T. S. Ding, Yanwu Shen, Dan Pham, Khanh Blasch, Erik Chen, Genshe Temple Univ Dept Elect & Comp Engn Philadelphia PA 19122 USA Wichita State Univ Dept Elect & Comp Engn Wichita KS 67260 USA Intelligent Fus Technol Inc Germantown MD 20876 USA Air Force Res Lab Kirtland AFB NM 87117 USA Air Force Res Lab Wright Patterson AFB OH 45433 USA

ISBN: (纸本)9798350329216;9798350329209

This paper considers a two-dimensional direction-of-arrival (DOA) estimation problem from a collaborative, distributed antenna array where each subarray is a distributed sensing node that is arbitrarily oriented. While the relative locations of the subarrays are not precisely known, it is assumed that the configuration of each subarray is locally calibrated whereas the cross-covariance matrix between a pair of distributed nodes includes an unknown phase difference. Without explicitly estimating such unknown phase difference, subspace-based DOA estimation methods fail to coherently utilize the subarrays to locate the DOAs of the impinging signals. We propose a group sparsity-based approach to achieve accurate DOA estimation that is resilient to unknown phase disparities between subarrays. Simulation results clearly illustrate the effectiveness of the group sparsity-based approach using group LASSO, and the superiority over subspace-based methods, such as the MUSIC algorithm, is demonstrated.

关键词： Direction-of-arrival estimation distributed array sparse array group sparsity unmanned aerial vehicle cube satellite network

来源：评论

学校读者我要写书评

暂无评论

An Improved DOA Estimation Method Based on Compressed Sensing for the distributed array 6

An Improved DOA Estimation Method Based on Compressed Sensin...

引用

6th International Conference on Information Communication and Signal Processing, ICICSP 2023

作者： Gao, Runze Fang, Lili Zhang, Xiaoyu Bao, Xiue School of Integrated Circuits and Electronics Beijing Institute of Technology Beijing China No.23 Inst. of the Second Academy China Aerospace Science and Industry Corporation Beijing China

ISBN: (纸本)9798350339994

Direction of Arrival (DOA) estimation is important for target detection in the distributed array, however, traditional DOA algorithms based on subspace, such as Multiple Signal Classification algorithm (MUSIC) and Estimating Signal Parameter via Rotational Invariance Techniques (ESPRIT), cannot be applied directly to distributed array since the emergence of unwanted grating lobes will make the estimation impossible. Orthogonal Matching Pursuit (OMP) algorithm is a kind of Compressed Sensing (CS) algorithm which utilized the sparsity of the echo signals, it could be applied for DOA estimation of the distributed array. Nevertheless, the accuracy of the reconstructed sparse matrix will decrease when the Signal-Noise-Ratio (SNR) is low or the number of snapshots is small, which could be improved by setting a smaller residual value to achieve more iterations. In this paper, an improved recovery method based on Particle Swarm Optimization (PSO) algorithm is proposed for the distributed array. This method could calculate the iteration termination condition threshold by PSO algorithm and avoid the deteriorate of accuracy and increase of complexity caused by excessive iteration. Simulation results showed that this algorithm could provide an accurate reconstructed matrix for low SNR and snapshots while avoiding the computation complexity. © 2023 IEEE.

关键词： compressed sensing direction of arrival distributed array orthogonal matching pursuit signal processing

来源：评论

学校读者我要写书评

暂无评论

Research on distributed Nested array Pattern Synthesis

Research on Distributed Nested Array Pattern Synthesis

引用

IEEE International Symposium on Antennas and Propagation / North American Radio Science Meeting

作者： Wang, Hongyong Deng, Weibo Suo, Ying Yang, Qiang Zhang, Xin Minist Ind & Informat Technol Key Lab Marine Environm Monitoring & Informat Pro 92 West Dazhi St Harbin Peoples R China

ISBN: (纸本)9781728166704

In this paper, a method of grating lobes and sidelobes suppression for distributed two-level nested array is presented. The method combines the distributed nested array structure and the pattern product theorem to obtain a distributed two-level nested array two-way pattern, which can effectively suppress the grating lobes and sidelobes. The Chebyshev window is used to design the weights of the transmit array pattern to achieve ultralow sidelobes performance. Numerical simulations are provided for testing the proposed method. Simulation results demonstrate the effectiveness of the proposed method, which will help to improve the detection performance of radar.

关键词： two-way pattern nested array distributed array grating lobe suppression Chebyshev window

来源：评论

学校读者我要写书评

暂无评论

DOA Estimation Method with the distributed Nested array 10

DOA Estimation Method with the Distributed Nested Array

引用

10th International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Liao, Yanping Zhao, Ruigang Liu, Hongyan Harbin Engn Univ Dept Informat & Commun Engn Harbin Heilongjiang Peoples R China Natl Key Lab Sci & Technol Test Phys & Numer Math Beijing Peoples R China

ISBN: (纸本)9781538661192

In this paper, we investigate the problem of direction of arrival (DOA) estimation in phased-array radar. The array consisting of two separated nested subarrays with dual baselines is used to form the DOA problem. And we present a new DOA estimation method, called weighting signal subspace MUSIC method (WSSMUSIC). By designing the separated nested array and using Khatri-Rao product processing, a large number of virtual array apertures are extended. With the redundancy removal and spatial smoothing, the rank of covariance matrix is restored. The short baseline within subarray yields non-ambiguous coarse DOA estimation by WSSMUSIC. Then the long baseline between subarray yields high accuracy and non-ambiguous DOA estimation by WSSMUSIC searching peak in search region which is determined by coarse DOA and main-lobe region. The virtual extension of aperture can be achieved for this array without increasing the number of sensors and computational complexity compared with traditional uniform linear array. And the proposed algorithm gives significant improvement in DOA estimation performance. The simulation results validate the theoretical algorithm.

关键词： distributed array Khatri-Rao product nested array direction of arrival (DOA) estimation disambiguation

来源：评论

学校读者我要写书评

暂无评论

distributed Scheme Versus MOFPA array on the Power Scaling of a Monolithic Fiber Laser

引用

IEEE JOURNAL OF QUANTUM ELECTRONICS 2014年第8期50卷 698-708页

作者： Ilchi-Ghazaani, Maryam Parvin, Parviz Amirkabir Univ Technol Dept Phys Photon Engn Grp Tehran 158754413 Iran

A couple of amplifying arrays for the power scaling of the fiber lasers under diverse pumping modes are studied. The multifiber series distributed side-pumping arrangement and the cascade amplifier chains in the form of the end-pumped master oscillator fiber power amplifier (MOFPA) scheme are investigated accordingly. Those are numerically modeled based on the propagation rate equations associated with stimulated Brillouin scattering (SBS) as well as the consideration of coupling and splicing losses for large mode area fibers. The continuous wave double-clad Yb:silica fiber laser amplifier is analyzed in various amplifying stages for several cavity lengths at forward pumping regime. Despite the distributed mode exhibits a desirable beam quality, however, it suffers a low SBS threshold. On the other hand, high output power is achieved in the MOFPA configuration far from the onset of SBS.

关键词： distributed array fiber laser - amplifier master oscillator fiber power amplifier numerical analysis with considering SBS side- and end-pumping

来源：评论

学校读者我要写书评

暂无评论

Performance Testing of a distributed Automotive Satellite Navigation array with Jammer in Virtual Environment 15

Performance Testing of a Distributed Automotive Satellite Na...

引用

15th European Conference on Antennas and Propagation (EuCAP)

作者： Hasnain, Syed N. Stephan, Ralf Brachvogel, Marius Meurer, Michael Hein, Matthias A. Tech Univ Ilmenau RF & Microwave Res Grp Thuringian Ctr Innovat Mobil Ilmenau Germany Rhein Westfal TH Aachen Chair Nav Aachen Germany German Aerosp Ctr DLR Inst Commun & Nav Wessling Germany

ISBN: (纸本)9788831299022

State-of-the-art antenna arrays require a significant installation area when envisaged for compact passenger cars, whose footprint area can be reduced by splitting the full array into two smaller, spatially distributed sub-arrays. The challenge of grating lobes develops while arranging the sub-arrays several wavelengths apart mounted on distant parts of a car. As a consequence, spatial sampling of the incident waves leads to ambiguous direction-of-arrival estimation. An inhomogeneous L-shaped orthogonal arrangement can, however, mitigate such drawbacks to some extent while allowing easier installation. The performance of such an array needs to be tested in a virtual electromagnetic environment in the course of the development process, even long before homologation. An example of such distributed array mounted on a conventional passenger car for satellite navigation is shown in this paper, and the array performance is tested in terms of positioning accuracy in presence of a jammer in our automotive antenna test facility.

关键词： distributed array automotive antenna satellite navigation direction-of-arrival interference mitigation position determination

来源：评论

学校读者我要写书评

暂无评论

Robustness Testing of a Compact distributed Automotive GNSS array in Virtual Environment 16

Robustness Testing of a Compact Distributed Automotive GNSS ...

引用

16th European Conference on Antennas and Propagation (EuCAP)

作者： Hasnain, Syed N. Stehr, Uwe Stephan, Ralf Brachvogel, Marius Meurer, Michael Hein, Matthias A. Tech Univ Ilmenau Thuringian Ctr Innovat Mobil RF & Microwave Res Grp Ilmenau Germany Rhein Westfal TH Aachen Chair Nav Aachen Germany German Aerosp Ctr DLR Inst Commun & Nav Wessling Germany

ISBN: (纸本)9788831299046

To develop a compact distributed array for safe and robust automotive satellite navigation, considerable work on testing prototypes is in progress. Bane scheduling resource-hungry outdoor tests, functionality and robustness of a Galileo-compatible compact distributed 4-element L-shaped array receiver has been tested against interference in a virtual environment at E5a frequency band. Such an array consisting of compact quarter wavelength sub-arrays distributed over many wavelengths, fed with a decoupling network, mounted in side mirrors of a mock-up car was measured and evaluated with and without a jammer. The effects of automotive mounting location and robustness of the receiver against the jammer have been analyzed in terms of measured radiation patterns and achieved carrier-to-noise-density ratio of the received satellite signals.

关键词： distributed array automotive antenna mounting location satellite navigation direction-of-arrival interference mitigation robustness Galileo E5a band

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：