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2016 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition, iWEM 2016

作者： Wang, You-Bao Wang, Xiang Rao, Yue-Fei Xiao, Shun Jiangsu Key Laboratory of Meteorological Observation and Information Processing Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing University of Information Science and Technology Nanjing210044 China

ISBN: (纸本)9781467381949

The technique to integrate the composite hermitian operator eigenfunctions (CHOEs) with the general asymptotic waveform evaluation (GAWE) is proposed for computing the radar cross section (RCS) of a perfect electric conductor (PEC). In the analysis, the orthogonal and complete properties of the CHOEs are used to construct the solution space of a matrix equation. Hence, the solution of the equation can be obtained by combining the based-vectors of the solution space with a set of coefficients, which can be determined by the GAWE technique at a given frequency. The results of numerical examples prove that the novel technique is effective in computing RCS. © 2016 IEEE.

关键词： Radar cross section

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Analysis of MIMO antenna array based on 3D Von Mises Fisher distribution

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The Journal of China Universities of Posts and Telecommunications 2015年第2期22卷 15-23页

作者： Zhou Jie Cao Zhigang Hisakazu Kikuchi Jiangsu Key Laboratory of Meteorological Observation and Information Processing Department of Electrical and Electronic Engineering

A three-dimensional （3D） Von Mises Fisher （VMF） distribution model was derived in multiple-input and multiple-output （MIMO） antenna communication environment. The azimuth of arrival and elevation of arrival are distributed for VMF distribution instead of the uniform or other traditional distributions. In particular the MIMO uniform Y-shaped array （UYA） and the uniform circular array （UCA） antenna topology are considered at mobile station and base station. The developed spatial fading correlation of the VMF model is determined by parameters of the concentration parameter, antenna spacing, mean azimuth of arrival, mean elevation of arrival. Using the channel model, the effects of the concentration parameter and the mean elevation angle on the capacity of MIMO antenna systems was analyzed. It is shown that the mean elevation of arrival must be taken into account in 3D MIMO communication environment.

关键词： MIMO antenna array VMF distribution spatial fading correlation channel capacity

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Frequency modulated weak signal detection based on stochastic resonance and genetic algorithm

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Instrumentation 2016年第1期3卷 41-49页

作者： XING Hongyan LU Chunxia ZHANG Qiang Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science & Technology Key Laboratory of Meteorological Observation and Information Processing of Jiangsu Province Nanjing University of Information Science & Technology

Stochastic resonance system is subject to the restriction of small frequency parameter in weak signal detection,in order to solve this problem,a frequency modulated weak signal detection method based on stochastic resonance and genetic algorithm is presented in this paper. The frequency limit of stochastic resonance is eliminated by introducing carrier signal,which is multiplied with the measured signal to be injected in the stochastic resonance system,meanwhile,using genetic algorithm to optimize the carrier signal frequency,which determine the generated difference-frequency signal in the lowfrequency range,so as to achieve the stochastic resonance weak signal detection. Results showthat the proposed method is feasible and effective,which can significantly improve the output SNR of stochastic resonance,in addition,the system has the better self-adaptability,according to the operation result and output phenomenon,the unknown frequency of the signal to be measured can be obtained,so as to realize the weak signal detection of arbitrary frequency.

关键词： stochastic resonance two-dimension Duffing oscillator frequency modulated genetic algorithm

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Research on the fractal model and calibration of the aerosol mass concentration measurement based on the particle group light scattering

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Chinese Optics Letters 2016年第11期14卷 104-109页

作者：顾芳刘毅张加宏陈云云崔芬萍 School of Physics and Optoelectronic Engineering Nanjing University of Information Science and Technology School of Electronic & Information Engineering Nanjing University of Information Science and Technology Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology Nanjing University of Information Science and Technology Jiangsu Key Laboratory of Meteorological Observation and Signal Processing Nanjing University of Information Science and Technology

In order to improve the inversion precision ot aerosol mass concentrations based on the particle group light scattering method,the concept that particles through a laser beam are equivalent to an aggregate is proposed.A fractal model for aerosol mass concentration using the signal amplitude distribution of aggregates is presented,and then the subsection calibration method is *** experimental results show that the mass concentrations in versed by this model agree well with those measured by the norm-referenced *** average relative errors of the two experiments are 5.6%and 6.0%,respectively,which are less than those obtained by the conventional inversion model.

关键词： Aerosols Aggregates Calibration Fractals Laser beams

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Application of Composite Hermitian Operator Eigenfunctions on Analysis of RCS

Application of Composite Hermitian Operator Eigenfunctions o...

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IEEE International Workshop on Electromagnetics

作者： You-Bao Wang Xiang Wang Yue-Fei Rao Shun Xiao Jiangsu Key Laboratory of Meteorological Observation and Information Processing Jiangsu Technology & Engineering Center of Meteorological Sensor Network Nanjing University of Information Science & Technology Nanjing China. Post Code: 210044.

ISBN: (纸本)9781467381956

关键词： GAWE RCS PEC

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Online-calibrated CS-based indoor localization over IEEE 802.11 wireless infrastructure

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Progress In Electromagnetics Research C 2016年 70卷 73-81页

作者： Ke, Wei Jin, Jie Xu, Hengkuan Yu, Kunliang Shao, Jianhua Jiangsu Key Laboratory on Optoelectronic Technology School of Physics and Technology Nanjing Normal University Nanjing210023 China Jiangsu Key Laboratory of Meteorological Observation and Information Processing Nanjing University of Information Science and Technology Nanjing210044 China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing210023 China

Recent technological achievements have made it low cost to realize indoor localization using the received signal strength (RSS) information from Wi-Fi signals. However, the current RSS-based indoor localization techniques have two major challenges: one is that the RSS signal is quite sensitive to channel conditions, and the other is that sufficient number of access points (APs) is needed to provide enough RSS measurements for guaranteeing good performance. To solve these problems, this paper proposes an adaptive compressive sensing (CS) based indoor localization method based on the IEEE 802.11 Wi-Fi standard. The novel feature of this method is to dynamically adjust both the dictionary and the sparse solution using an online dictionary learning (DL) technology so that the location solution can better match the real-time RSS scenario. Meanwhile, an improved approximate l0 norm minimization algorithm is presented to enhance sparse recovery speed and reduce the number of APs required by indoor localization systems. The effectiveness of the proposed scheme is demonstrated by experimental results where the proposed algorithm yields substantial improvement for localization performance and reduces computation complexity. © 2016, Electromagnetics Academy. All Rights Reserved.

关键词： Compressed sensing

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Device-free electromagnetic passive localization using link line information in wireless sensor networks

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Progress In Electromagnetics Research C 2016年 63卷 95-103页

作者： Li, Li Ke, Wei Zhang, Xiunan Yuan, Yanan Shao, Jianhua Department of Mechanical and Electrical Engineering Nantong College of Science and Technology Nantong226007 China Jiangsu Key Laboratory on Optoelectronic Technology in School of Physics and Technology Nanjing Normal University Nanjing210023 China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing210023 China Jiangsu Key Laboratory of Meteorological Observation and Information Processing Nanjing University of Information Science and Technology Nanjing210044 China

The electromagnetic passive localization without the need of carrying any device, named device-free passive localization (DFPL) technique, is an emerging technology for determining an uncooperative target's position. The DFPL technique detects the shadowed links in a monitored area and realizes localization with the received signal strength (RSS) measurements of these links. However, most current RSS-based DFPL schemes belong to the model-based DFPL method, since the localization accuracy depends on the shadowing model. Moreover, model-based DFPL methods require high memory and computing resources for accurate tracking performance, and thus may not be suitable for resource-constrained applications. To overcome these problems, in this paper we propose a lightweight DFPL method which makes use of recent link lines detected by wireless sensor networks to estimate the target's location. This method can be independent of the shadowing model and can also reduce the algorithm's storage and computational resource requirements. The effectiveness and robustness of the proposed scheme are demonstrated by experimental results where the proposed algorithm yields substantial improvement for localization performance and complexity. © 2016 Electromagnetics Academy. All right reserved.

关键词： Wireless sensor networks

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Reducing the number of sensors in a linear antenna array by pnorm minimization algorithm

International Journal of Signal Processing, Image Processing...

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International Journal of Signal processing, Image processing and Pattern Recognition 2016年第9期9卷 25-32页

作者： Chen, Jinli Cao, Huasong Li, Jiaqiang Ge, Junxiang Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and Technology Nanjing210044 China College of Electronic and Information Engineering Nanjing University of Information Science and Technology Nanjing210044 China Jiangsu Key Laboratory of Meteorological Observation and Information Processing Nanjing University of Information Science and Technology Nanjing210044 China

The excitations and locations of sensors in the non-uniformly spaced array affect the array performance such as sidelobe level and spatial resolution. Consequently, finding the optimal excitation coefficients and sensor positions of the array to produce a desired beam pattern with the smallest number of sensors is of great importance in practice. With the aim of reducing the number of the sensors in a linear antenna array, a novel method based on p(01norm minimization (IRWL1) method, the proposed method can reduce more array sensors by optimizing the objective functions that include the measurements of peak sidelobe level (PSL) and array sparsity denoted by the pnorm of excitations. Numerical experiments have proved the effectiveness and advantages of the proposed method in the reduction of the number of the sensors of the linear antenna array. © 2016 SERSC.

关键词： Iterative methods

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Influence of defects on the Young's modulus of silicon nanowires with different cross sections

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key Engineering Materials 2015年 645卷 151-156页

作者： Gu, Fang Zhang, Jiahong Li, Min Liu, Linyan Su, Jing School of Physics and Optoelectronic Engineering Nanjing University of Information Science and Technology Nanjing China Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology Nanjing University of Information Science and Technology Nanjing210044 China Jiangsu Key Laboratory of Meteorological Observation and Information Processing Nanjing University of Information Science and Technology Nanjing China

The size dependence becomes more significant as the devices scale down from micro- to nano-dimensions, which is generally attributed to surface effects due to the very high surface-to-bulk ratios in nanoscale structures. However, significant discrepancies between experimental measurements and computational studies indicate that there could be other influences besides surface effects, such as the influences of native oxide layer, fabrication-induced defects and boundary conditions. In this paper, our purpose is to investigate mainly the influence of fabrication-induced defects on the elasticity of [110] silicon nanowires (SiNWs) with different cross sections. We accomplish this by using the molecular dynamics (MD) simulation. Our MD results show that the H-passivated [110] SiNWs without surface defects is slightly elastically softer than bulk, which is in good agreement with other literature MD values. However, the effective Young's modulus of SiNWs with surface defects can significantly decreases as the defects increase. This softening behavior of [110] SiNWs is severe, which indicates the importance of surface defects. It is noted that the influence of defects on the Young's Modulus of SiNWs strongly depended on the distribution and morphology of defects as well as the cross-sectional shapes of SiNWs. It is observed that the influence of defects on square SiNWs is significantly different from those of hexagonal and triangle SiNWs. Our work reveals that fabrication-induced surface defects could be one of the important origins of the reduced effective Young's modulus experimentally observed in ultra-thin SiNWs. Therefore, the effect of defects on the characterization of the mechanical properties of nanowire must be carefully considered. © (2015) Trans Tech Publications, Switzerland.

关键词： Elastic moduli

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Humidity sensor based on perfect metamaterial absorber

Humidity sensor based on perfect metamaterial absorber

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International Conference on Numerical Simulation of Optoelectronic Devices, (NUSOD)

作者： B. Ni Z. Y. Wang R. S. Zhao X. Y. Ma Z. Q. Xing L. S. Yang L. J. Huang Y. Y. Lin D. B. Zhang Jiangsu Key Laboratory of Meteorological Observation and Information Processing Nanjing University of Information Science & Technology Nanjing China Department of Material Science and Engineering North Carolina State University Raleigh USA College of Photonic and Electronic Engineering Fujian Normal University Fuzhou China Dept. of Physics Changshu Institute of Technology Changshu China

ISBN: (纸本)9781467386043

We proposed a humidity sensor based on perfect metamaterial absorber. The sensor is composed of three layers, which are metallic particle array on the top, porous silicon in the middle layer and metallic film at the bottom. It is shown that the resonant wavelength displays significant red-shift with the increasing effective permittivity of porous silicon, which is influenced by the filling fraction of water condensation. Furthermore, the simulation results indicate that the refractive index sensitivity of absorber is high to 249 nm/RIU, which makes our structure be an ideal candidate for evaluating the humidity of environment.

关键词： Permittivity Metamaterials Plasmons Gold Humidity Filling

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