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检索条件"机构=National Key Laboratory of Science and Technology on Test Physics and umerical Mathematics"

共 319 条记录，以下是11-20 订阅

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Semantic Segmentation Algorithm of Street View Image Via Deep Learning

Semantic Segmentation Algorithm of Street View Image Via Dee...

引用

2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Zhu, Zihui Cai, Wenlin Li, Jianhua Xue, Feng Gao, Lu Liu, Jiaqi National Key Laboratory Science and Technology on Test Physics and Numerical Mathematics Beijing China

ISBN: (纸本)9781665452366

Real-time semantic segmentation of street view images can be used as a visual aid system during autonomous driving. This paper proposes a multi-branch cross-layer fusion network (MCFNet). The model uses a multi-branch network to extract features, fuses the features of different stages of multiple branches for prediction, and uses a lightweight depthwise separable convolution to reduce the amount of computation. We use the Cityscapes dataset to train and evaluate the algorithm and get 61.6% mIoU and 115.3 fps. © 2022 IEEE.

关键词： Convolution

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A New Criterion For Optimization Of Total Variation Denoising

A New Criterion For Optimization Of Total Variation Denoisin...

引用

2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Xue, Feng Ai, Xia Gao, Lu Liu, Jiaqi National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing100076 China

ISBN: (纸本)9781665452366

Based on Chambolle's algorithm, we develop a data-driven optimization scheme based on minimization of Stein's unbiased risk estimate (SURE) - statistically equivalent to mean squared error (MSE). We propose a recursive evaluation of SURE to monitor the estimation error during Chambolle's iteration;the optimal value is then identified by the minimum SURE. We exemplify the proposed methods with 1-D signal denoising. © 2022 IEEE.

关键词： Iterative methods

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Influence of particle size distribution on the radiation characteristics of SiC particle swarm 9

Influence of particle size distribution on the radiation cha...

引用

9th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Yanan, Li Xia, Ai Lu, Gao Shikui, Dong Beijing University of Technology Beijing China National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing China Harbin Institute of Technology Harbin China

ISBN: (纸本)9781510664432

Based on electromagnetic scattering mechanism, Mie scattering theory and Monte Carlo method are used to analyze the radiation characteristics of SiC particle swarm with different distribution forms in this paper. The study find that the form of particle size distribution has a significant impact on the spectral transmittance of particle swarms. The proportion of particles of different sizes in the particle size distribution, the dispersion of particle size distribution, and the span of particle size scale all affect the infrared extinction performance of particle swarms in varying degrees. Among them, the proportion of particles of specific size in the particle size distribution is the most one, which is a necessary factor to ensure the existence and amplitude of particle characteristic spectra. The relationship between particle size distribution and radiation characteristics was deeply analyzed, and the results showed that increasing the proportion of particles within the 0.16~2.5µm particle size range of SiC particle can comprehensively improve the extinction performance of SiC particle swarm, which is of practical significance for optimizing the infrared radiation performance of particle swarms. © 2023 SPIE.

关键词： Particle size analysis

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Full-Space Beam Scanning Antenna Based on Spoof Surface Plasmon Polaritons

Full-Space Beam Scanning Antenna Based on Spoof Surface Plas...

引用

2023 International Applied Computational Electromagnetics Society Symposium, ACES-China 2023

作者： Wu, Zhicheng Kong, Xianglin Wang, Jun Xu, Ruofeng Zhao, Lei Xu, Yinfang School of Information and Control Engineering China University of Mining and Technology Xuzhou China National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China

ISBN: (纸本)9781733509657

In this paper, a full-space beam scanning antenna based on spoof surface plasmon polaritons (SSPPs) is proposed. The proposed antenna is composed of a SSPPs loaded by the varactor diodes and periodic metallic patches. The periodic patches can transform the slow waves from SSPPs into fast waves, and the cutoff frequency can be reconfigured by changing the capacitance of the varactor diode, which will make the radiation angle of the beam change within a fixed frequency. Simulation results show that the radiation angle ranges from -90° to 90° at 9 GHz. © 2023 Applied Computational Electromagnetics Society (ACES).

关键词： Scanning antennas

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Modeling of atmospheric radiative transfer with polarization effects using scattering phase matrix 29

Modeling of atmospheric radiative transfer with polarization...

引用

Remote Sensing of Clouds and the Atmosphere XXIX 2024

作者： Zou, Mengfan Li, Jianhua Xu, Xiaojian He, Xiaoyu School of Electronic and Information Engineering Beihang University 37 Xueyuan Road Beijing100191 China National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing100076 China

ISBN: (纸本)9781510680944

Solar radiation will be scattered by atmospheric molecules and aerosol particles when it transfers through the Earth atmosphere. The scattered radiance with different polarization state can be used to characterize atmospheric components. Based on the BHU-ATM presented in our previous work, an atmospheric radiative transfer model considering the polarization effects is developed in this paper, in which the parameter discretization method is used. To this end, the radiative transfer equation is adapted into the Stokes vector form, while the impacts of atmospheric molecules and aerosols on the polarization state of the scattered radiance are represented by means of the scattering phase matrix. The Curtis-Godson approximation and the two-stream approximation are used to obtain the analytical solution of the adapted radiative transfer equation. As the precise calculation of the scattering phase matrix varying with the scattering angle and the radiant wavelength is inefficient for the calculation of spectral path radiance, a novel aspect of this work is the efficient computation of the scattering phase matrix through a two-dimensional interpolation method, significantly reducing computational complexity while maintaining accuracy across a broad range of angles and wavelengths. The simulation results of the atmospheric transmittance, the spectral radiance and the degree of polarization (DOP) for an arbitrarily selected transfer path are given. As it can be seen, in the spectrum from the visible through the near infrared (VNIR), the polarization modeling showed a maximum transmittance difference of 0.0007 and a spectral radiance difference of 0.3 W/m2/μm/sr. The DOP varied significantly, with a difference of up to 0.12 between urban and ocean aerosols. The developed polarization model can improve aerosol component identification in satellite-based remote sensing applications, aiding in more accurate air quality monitoring and enhancing climate models that account for aeroso

关键词： Light scattering

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Source-Configured Microwave Plasmonic Vortices Based on Single Meta-Particle

Source-Configured Microwave Plasmonic Vortices Based on Sing...

引用

2023 International Applied Computational Electromagnetics Society Symposium, ACES-China 2023

作者： Kong, Xianglin Zhao, Lei Shen, Xiaopeng Xu, Yinfang School of Information and Control Engineering China School of Materials Science and Physics China University Mining and Technology Xuzhou China National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing China

ISBN: (纸本)9781733509657

In this paper, generation of plasmonic vortices with tunable topologic charges is proposed in the microwave regime. Tunable vortices with topologic charges of 0, +1 and -1 can be configured by illuminating incident plane waves with linearly polarization (LP), left-circularly polarization (LHCP) and right-circularly polarization (RHCP) on a single meta-particle, respectively. A spiral meta-particle operating at 2.94 GHz is designed, fabricated and measured to demonstrate the source-configured characteristics. The results showed that simulation and test are consistent with the theoretical ones. © 2023 Applied Computational Electromagnetics Society (ACES).

关键词： Vortex flow

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Application of Graphic Electromagnetic Computing in Electrically Large Scale Composite Target Scattering

Application of Graphic Electromagnetic Computing in Electric...

引用

2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Gao, Lu Fang, Ning Wang, Mingliang Liu, Jiaqi Li, Yanan Wu, Runhui Xu, Yinfang National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing China Beihang University Academy of Electronic Information Engineering Beijing China National Key Laboratory of Science and Technology on Test Physics Beijing China

ISBN: (纸本)9781665452366

The radar cross section(RCS) calculation model of electrically large-scale composite target is established by combining graphic electromagnetic computing(GRECO) with high-frequency optical approximation and physical diffraction. Using different illumination modes, the normal vector at each point on the target surface is obtained, and the total scattering field of the target is acquired by the coherent superposition of the scattering field and the diffraction field at each point on the target surface. © 2022 IEEE.

关键词： Radar cross section

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Measurement and Analysis of Si3N4 Particles by Infrared Spectrum 3

Measurement and Analysis of Si3N4 Particles by Infrared Spec...

引用

3rd International Computing Imaging Conference, CITA 2023

作者： Wang, Xiaoli Li, Yanan Wei, Sai Li, Xinghua Yu, Han Aerospace Research Institute of Materials & Processing Technology Beijing China Beijing University of Technology Beijing China National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing China

ISBN: (纸本)9781510671409

In this paper, the principle of Attenuated Total Reflection (ATR) is used to test and study the silicon nitride particle samples, and the influence of particle size, shape and crystal phase on its infrared spectral performance is emphatically analyzed. It is found that the larger the particle size of Si3N4 is, the more its extinction peak moves to the long wave. The smaller the particle size is, the lower the extreme value of infrared transmission in the characteristic spectrum segment is. For Si3N4 particles of the same scale, spherical like particles can obtain lower infrared transmittance, while cylindrical like ones show a wider range of infrared absorption bands. Under the same shape and similar scale, α Phase Si3N4 particles have better infrared absorption than β Phase. © 2023 SPIE.

关键词： Fourier transform infrared spectroscopy

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Electromagnetic Computational Modeling and Bistatic Scattering Characteristics Analysis of Spherical Jammer Group

Electromagnetic Computational Modeling and Bistatic Scatteri...

引用

Intelligent Communication, Sensing and Electromagnetics (ICSE), International Conference on

作者： Wei Xin Xin Liu Weidong Wang National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing China

ISBN: (数字)9798350354935

ISBN: (纸本)9798350354942

Bistatic radar is widely used in the military field with its good anti-jammer ability and accurate detection and identification ability. How to implement effective jammer for this kind of radar system has become a research hotspot at present. Due to the small scattering intensity and weak echo energy of j ammer monomer, it has no advantage in countering the bistatic radar. It is necessary to release multiple jammers to form a group to form strong scattering, so as to interfere with the bistatic radar to detect and recognize the target, so the study on the scattering characteristics of the jammer group is particularly important. Therefore, this paper takes the group composed of spherical monomer as an example, first of all, MATLAB and CST STUDIO SUITE (CST) are used for joint modeling, and then electromagnetic simulation calculation is carried out on the group of spherical jammer objects with different bands, different sphere sizes, different group densities and different group distributions to analyze the bistatic scattering characteristics under different parameters. The research results show that the four parameters will have different degrees of influence on the bistatic scattering characteristics of the spherical jammer group, which provides a theoretical basis and data support for parameter selection and airspace planning against the bistatic radar.

关键词： Analytical models Radar cross-sections Target recognition Computational modeling Atmospheric modeling Electromagnetic scattering Bistatic radar Stability analysis Jamming Electromagnetics

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Dynamic event-triggered cooperative tracking algorithm for high-speed vehicles 4

Dynamic event-triggered cooperative tracking algorithm for h...

引用

2024 4th International Conference on Mechatronics, Automation and Intelligent Control, MAIC 2024

作者： Chen, Yu Cai, Yuanli Liu, Jiaqi Deng, Yifan Lu, Jing Faculty of Electronic and Information Engineering Xi’an Jiaotong University Shanxi Xi’an China National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China Shanghai Institute of Satellite Engineering Shanghai China

To address the challenges of single-sensor visual limitations and network congestion in tracking high-speed vehicles, a dynamic event-triggered cooperative cubature Kalman filtering algorithm is proposed. Initially, a dynamic event-triggered mechanism is developed based on measurement state information to reduce bandwidth consumption and enhance system responsiveness. Subsequently, within the framework of the cubature Kalman Filter, the covariance matrix and filtering gain matrix for each sensor’s distributed filter are derived using minimum mean square error approximation techniques. Finally, a cooperative filtering algorithm is designed using a weighted average consensus method and applied to tracking of hypersonic glide vehicles. Simulation results demonstrate that the proposed algorithm achieves higher accuracy compared to existing methods. © 2024 Institute of physics Publishing. All rights reserved.

关键词： Kalman filters

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