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共 354 条记录，以下是131-140 订阅

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UAV Training control and Evaluation Method Based on Dynamic Task Construction 17th

UAV Training Control and Evaluation Method Based on Dynamic ...

引用

17th Chinese Intelligent Systems Conference, CISC 2021

作者： Tong, Jiahui Zhang, Qing Ran, Jian Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing China Beijing Electromechanical Engineering Institute Beijing China

ISBN: (纸本)9789811663277

In view of the problems such as high cost, low training efficiency and lack of versatility, a design scheme of UAV simulation training system based on dynamic mission construction is proposed, and the reproducing dynamic mission environment simulation technology and UAV training control and result evaluation and method are described in detail. The evaluation system of UAV simulation training results based on multi-factor influence data is constructed, which can effectively guide the simulation training of multi-type UAV and improve the overall training effect of UAV operators by synthesizing historical training data and real-time training data. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Unmanned aerial vehicles (UAV)

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Research on Simulation Method of Space-Ground Consistency for UAV Cluster Combat

Research on Simulation Method of Space-Ground Consistency fo...

引用

International Conference on Autonomous Unmanned Systems, ICAUS 2021

作者： Qing, Zhang Jing, Li Jiahui, Tong Jian, Han Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing China Beijing Electromechanical Engineering Institute Beijing China

ISBN: (纸本)9789811694912

The Space-ground consistency of the unmanned aerial vehicle (UAV) cluster combat distributed interactive simulation system is the fundamental guarantee to simulate and reproduce the authenticity and correctness of UAV cluster combat mission, combat environment and combat process. This paper analyzes the common inconsistency problems of UAV cluster combat distributed simulation system, gives the technical connotation of the space-ground consistency of UAV cluster combat simulation, deeply analyzes all kinds of factors that affect the consistency of UAV cluster combat simulation space and ground, and puts forward the control methods of time-space consistency of UAV cluster combat simulation system, the control strategies and suggestions of model consistency and service consistency. It provides a theoretical basis and technical support for the construction of distributed interactive simulation system for UAV cluster combat. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Unmanned aerial vehicles (UAV)

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Strong Electromagnetic Protection Circuit for RF Front End of Autodyne Radio Fuze 13

Strong Electromagnetic Protection Circuit for RF Front End o...

引用

13th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2021

作者： Wang, Cheng Chen, Wei Wen, Rui-Hu Science and Technology on Electromechanical Dynamic Control Laboratory China Xi'an Electromechanical Information Technology Research Institute China

ISBN: (纸本)9781665418126

In order to solve the problem that the RF front end of autodyne radio fuze is weak in resisting high-power and energy-based jamming, a design method of electromagnetic protection circuit for RF front end is proposed. The method is to add an electromagnetic protection circuit composed of microwave limiter, RF band-pass filter, and single pole double throw switch, which between RF front-end circuit and transceiver antenna of the autodyne radio fuze. The electromagnetic protection of RF front-end core high-frequency devices is carried out by means of excess energy attenuation, selection of passing frequency, and transmission channel locking. Experimental verification shows that the electromagnetic protection circuit can protect the RF front end of the Autodyne radio fuze in both the frequency domain and the time domain, and improve the survivability of the fuze in the high EM environment. © 2021 IEEE.

关键词： Microwave limiters

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V-band antipolar fin line microstrip waveguide conversion structure 13

V-band antipolar fin line microstrip waveguide conversion st...

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13th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2021

作者： Chen, Wei Wen, Rui-Hu Zheng, Xiao-Yan Liu, Shui-Ying Niu, Lan-Jie Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an710065 China

ISBN: (纸本)9781665418126

The V-band microstrip waveguide conversion structure cannot meet the requirements of simple installation and integrated design. The fin line structure with specific size and shape is etched on the surface of the film. By adjusting the parameters of the opposite pole fin line, the conversion structure can meet the requirements of practical performance. The test results show that the center frequency of antipolar fin line microstrip waveguide conversion structure is 71.6GHz, the internal reflection parameter S11 is less than -20dB in the bandwidth of 67.3-77.0GHz and 10GHz, and the conversion structure size is 6.56mm*1.47mm*0.127mm. The conversion structure is installed in the middle of the V-band waveguide along the E-plane of the waveguide, without slotting the waveguide wall, which meets the requirements of superior performance, simple installation and integrated design. © 2021 IEEE.

关键词： Fins (heat exchange)

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Research on a fuze anti-jamming strategy under the background of complex ground objects 13

Research on a fuze anti-jamming strategy under the backgroun...

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13th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2021

作者： Xia, Lei Dai, Liang Zou, Jin-Long Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an710065 China

ISBN: (纸本)9781665418126

Aiming at the problem of the reduced reliability of the radio proximity fuze under the jamming of complex ground objects,a method of fixed height for laser and radio combined detection is proposed. Using the method of dual-beam separate airspace detection and information fusion,a mathematical model of the fuze's fixed height initiation is established. Through the analysis of the dynamic ground detection model and the ground objects jamming detection model, this design idea and mathematical model against the ground objects jamming effectiveness are confirmed. © 2021 IEEE.

关键词： Object detection

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Dual-Band Flexible Terahertz Sensor Based on Rotated Metamaterial Structure

Dual-Band Flexible Terahertz Sensor Based on Rotated Metamat...

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2023 IEEE MTT-S International Wireless Symposium, IWS 2023

作者： Wang, Dongxu Xu, Kai-Da School of Information and Communications Engineering Xi'an Jiaotong University Xi'an China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China East China Normal University State Key Laboratory of Precision Spectroscopy Shanghai200241 China

ISBN: (纸本)9798350336535

In this article, a terahertz flexible metamaterial sensor with dual-band operating characteristics is introduced. The gold metamaterial array is arranged on the top surface of a polyimide film, while the structure is made up of a rotated structure with spiral-shaped strips. Two resonances occur at 0.37 and 1.13 THz with outstanding polarization insensitivity. The metamaterial sensor also has sensitive refractive index sensing properties, with sensitivities of 0.1 THz/RIU and 0.3 THz/RIU, respectively, at the two operating bands. This work shows potential applications in refractive index and nesticide sensing. © 2023 IEEE.

关键词： Metamaterials

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A Symmetry Treatment in Cylindrical Explicit and Unconditionally Stable FDTD Method

A Symmetry Treatment in Cylindrical Explicit and Uncondition...

引用

International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Sihan Zhao Bing Wei Yuanfei Hui Tie Li Gang Li Tiantian Feng Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China School of Physics Xidian University Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

A symmetry treatment in cylindrical explicit and unconditionally stable FDTD (CEUS-FDTD) method is given. The system matrix of CEUS-FDTD method is unsymmetric, which will render instability since the explicit central–difference scheme is used for temporal discretization. By splitting the grid matrix reasonably and modifying the corresponding coefficients, the system matrix is transformed into a new symmetric matrix compulsively. Then an additional diagonal matrix will be obtained naturally on the other side of the equation to ensure that the time marching equation still holds. At last, unstable modes could be obtained by solving generalized eigenvalue problem of the new symmetric system matrix with respect to the diagonal matrix. Numerical results illustrates that the stability of CEUS-FDTD could be ensured and the accuracy would not be affected.

关键词： Symmetric matrices Accuracy Antenna theory Power system stability Eigenvalues and eigenfunctions Time-domain analysis Numerical stability Finite difference methods

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Research on a projectile-borne measuring apparatus for electromagnetic launcher 4

Research on a projectile-borne measuring apparatus for elect...

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4th International Conference on Mechanical, Electric and Industrial Engineering, MEIE 2021

作者： Cao, Ronggang Hu, Xueyi Dong, Erwa Ma, Xiao Zhou, Yu Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China

In order to evaluate the electromagnetic launch effectiveness and understand the corrosion damage of the electromagnetic launcher, it is necessary to master the magnetic field data in the bore. At present, there is no related research on the measurement of the bore magnetic field of the electromagnetic launcher. Therefore, a small-scale projectile-borne measuring apparatus based on B-dot probe is developed in this paper. This apparatus uses FPGA as the core. Through the static magnetic field measurement experiment, the data of the induced voltage and the induced magnetic field can be obtained. The projectile-borne magnetic field measuring apparatus designed in this paper can accurately measure the bore magnetic field of the electromagnetic launcher, which lays the foundation for further analysis of the influence of the electromagnetic field in the bore on the launch effect and investigation of the corrosion damage of the electromagnetic launcher. © Published under licence by IOP Publishing Ltd.

关键词： Projectiles

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Tunable Chirality and Helicity of Bessel Twisted Beams Near the Dirac Points in Topological Metacrystal

Tunable Chirality and Helicity of Bessel Twisted Beams Near ...

引用

International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Yuanfei Hui Zhiwei Cui Sihan Zhao Tie Li Gang Li Haijun He Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China School of Physics Xidian University Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

In this work, we undertake an approach to describe the tunable optical chirality and helicity of twisted beam near the Dirac point in topological meta-crystals. An improved method based on the full vector wave analysis is introduced to investigate the chirality and helicity of Bessel twisted beams near the Dirac point in the interface of topological meta-crystals. It is showed that the giant non-specular effects of chirality and helicity are discovered when a Bessel twisted Beam reflects in the vicinity of a Dirac point, which is sensitive to the incident frequency, angle, and electromagnetic properties of the topological meta-crystal. We can attribute the giant non-specular effect of chirality and helicity to the degeneracy between critical angle and Brewster angle caused by the Dirac point. The results will be of significant interest of study the measurement of Dirac point, and inspire a perspective for manipulating twisted beams with Dirac point.

关键词： Analytical models Antenna theory Beams Vectors Metamaterials Optical sensors Optical reflection Electromagnetic fields Electromagnetics Photonics

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Structural and optical characteristics of InAs0.02Sb0.82N0.16thick epilayers grown by melt epitaxy

Structural and optical characteristics of InAs0.02Sb0.82N0.1...

引用

2023 Advanced Fiber Laser Conference, AFL 2023

作者： Gao, Yuzhu Chen, Zun Tian Hayakawa, Yasuhiro College of Electronics and Information Engineering Tongji University Shanghai201804 China Science and Technology on Electromechanical Dynamic Control Laboratory Xian710061 China Research Institute of Electronics Shizuoka University Johoku 3-5-1 Hamamatsu432-8011 Japan

ISBN: (纸本)9781510677661

InAs0.02Sb0.82N0.16 thick epilayers have been grown on InAs substrates by melt epitaxy (ME) technology. Fourier transform infrared (FTIR) transmission spectra showed that the cutoff wavelength of InAs0.02Sb0.82N0.16 samples grown by ME is 10.0 μm indicating the band gap narrowing. The thickness of the epilayers grown by ME observed by scanning electron microscopy (SEM) reaches 183 μm. X-ray diffraction (XRD) measurements confirmed that the epilayers are single crystals. The full-width at half-maximum (FWHM) of InAs0.02Sb0.82N0.16 (400) CuKα1 diffraction peak is 298.8 arcsec. The high quality of the crystals benefits from the thickness of the epilayers exceeding 100 μm, which significantly suppresses the effect of the lattice mismatch between InAs0.02Sb0.82N0.16 epilayers and InAs substrates. Energy dispersive spectrometer (EDS) attached SEM measurements revealed that 16% nitrogen has been incorporated in the epilayers. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： III-V semiconductors

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