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共 347 条记录，以下是71-80 订阅

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Time-series Data Modeling Guided by Visual Information 11

Time-series Data Modeling Guided by Visual Information

引用

2023 IEEE 11th International Conference on Information, Communication and Networks, ICICN 2023

作者： Zhang, Ke Wang, Junzheng Zhang, Xiang Shi, Yu Wang, Ting Beijing Institute of Technology School of Automation Beijing China Xi'An Institute of Electron-mechanical Information Technology Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (纸本)9798350314014

Time-series data typically contain issues such as missing data and noise, which can impact the model's precision and stability. This paper proposes a Transformer structure-based visual information-guided temporal data modeling algorithm to address the issues as mentioned above. The algorithm effectively captures the time-series structure of the time-series data, thereby enhancing the model's precision and stability. To evaluate the performance of the proposed algorithm, a dataset containing visual information aligned with time-series data is compiled, and a comprehensive quantitative and qualitative analysis is performed. Conduct a comprehensive quantitative and qualitative analysis. The results indicate that visual information can assist time-series data in capturing the intricate dynamics of the time-series data, thereby enhancing the performance of the proposed algorithm and facilitating its comprehension. The results indicate that visual information can assist time-series data in capturing the complex dynamics of time-series data, and thus in comprehending and predicting their behavior and trends. The application of this algorithm will advance research in the field of modeling and predicting time series data. Applying this algorithm will advance research and practice in modeling and forecasting time series data. © 2023 IEEE.

关键词： Time series

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Preliminary Study on the Method of Generating Infrared Image Based on CycleGAN 19th

Preliminary Study on the Method of Generating Infrared Image...

引用

19th Chinese Intelligent Systems Conference, CISC 2023

作者： Sun, Baiping Tong, Jiahui Geng, Huapin Beijing Electromechanical Engineering Institute Beijing China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing China

ISBN: (纸本)9789819968855

Traditional infrared scene simulation method mainly includes the establishment of 3D geometric model of the target, the establishment of scene radiation model, the relationship mapping between infrared radiation and infrared image gray value and other steps. The whole process is tedious, and contain more calculated parameters. This paper introduce CycleGAN network, draw on its ring network structure and unpaired data or paired data as a training set, realize the advantages of domain image conversion effect, explore the visible light image conversion into corresponding infrared image, solve the problems such as samples in the process of infrared imaging simulation is limited, fidelity is low, and coverage is limited. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Infrared radiation

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Classification Method of Echo and Interference Signal Support Vector Machine Based on Two-Dimensional Characteristic Parameters

Classification Method of Echo and Interference Signal Suppor...

引用

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

作者： Wei Chen Rui-hu Wen Kai-li Yang Zi-tong Li Gan Zhang Xi-yu Wang Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

In order to improve the anti-jamming ability of FM fuze in electronic countermeasures, a support vector machine classification method for echo signal and jamming signal based on two-dimensional characteristic parameters was proposed. In this method, the actual target echo signal and the guided jamming signal of the frequency modulated fuze are taken as the research objects, and the time domain information entropy and frequency domain information entropy are used as the two-dimensional feature parameters, and the two signals are classified and identified by the support vector machine classification method. Through laboratory tests, it can be seen that the classification accuracy can reach more than 95%.

关键词： Time-frequency analysis Frequency modulation Accuracy Support vector machine classification Vectors Object recognition Jamming Information entropy Time-domain analysis Electronic countermeasures

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Direct Printing of Curved Conformal Antennas

Direct Printing of Curved Conformal Antennas

引用

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

作者： Gaoling Ma Helong Jin Xiaojun Zhi Zhenye Gao Haichao Zhong Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an Institute of Electromechanical Information Technology Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

Conformal antenna has the characteristics of miniaturization, low profile and large aperture, which is one of the key antenna development trends in the future. How to realize the conformal printing of antennas has been a tricky problem. We propose a high-precision microdroplet jet printing method of conformal antenna, which realizes direct conformal antenna direct printing on curved surfaces. By theoretically deriving the directional map function of an arbitrary directed array, a conical conformal antenna model is established, and the directional map function of the conformal antenna array is obtained. The test results show that the strategy can accurately print a conformal antenna on a curved surface, and the antenna's operating frequency is basically the same as that of the design, with a small return loss, which can satisfy the performance and usage requirements, and it can provide a technical basis for the subsequent design and processing of conformal antennas.

关键词： Printing Antenna theory Directive antennas Propagation losses Aperture antennas Wire Antennas Surface treatment Substrates Antenna arrays

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Nonlinear Spline Prioritization Optimization Adaptive Filter

Nonlinear Spline Prioritization Optimization Adaptive Filter

引用

International Conference on Guidance, Navigation and control, ICGNC 2022

作者： Guo, Wenyan Zhi, Yongfeng Gao, Huan School of Automation Northwestern Polytechnical University Xi’an710129 China Science and Technology on Electromechanical Dynamic Control Laboratory Xi’an710065 China

ISBN: (纸本)9789811966125

The nonlinear spline prioritization optimization adaptive filter (SPOAF) utilized for system identification is proposed to solve the poor steady-state accuracy caused by the mismatched feedback error of the adaptive strategy in spline adaptive filter (SAF). The FIR filter weight is designed to be updated based on the linear error of the linear module. Then, control point is updated according to the error of the whole system. Next, the least mean square algorithm (LMS) and stochastic gradient descent algorithm (SGD) are applied to the nonlinear spline prioritization optimization adaptive filter. Finally, the convergence performance of the proposed SPOAF approach is analyzed. The simulation confirms the effectiveness and efficiency of our proposed SPOAF algorithm. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Adaptive filters

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The Influence of Jungle Background on the Dispersal Pattern of Fuze Explosion Points

The Influence of Jungle Background on the Dispersal Pattern ...

引用

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

作者： Chengcheng Yang Haichao Zhong Gang Li Tie Li Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an Institute of Electromechanical Information Technology Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

To address the poor adaptability of guided suppression fuzes in jungle backgrounds and enhance radio fuzes' target detection, identification, and anti-jamming capabilities, a study was conducted on the impact of jungle background on fuze burst point control accuracy. Based on the measured data of the backward scattering characteristics of the jungle collected by the fuze, the distribution characteristics of fuze burst points under different wavebands and pitch angles in the jungle background were obtained. The study analyzed the effects of the jungle environment on the fuze's distance-setting accuracy. The findings indicate a strong correlation between the distribution of burst points and the electromagnetic scattering characteristics of the jungle. The dispersion of burst points follows a Gaussian distribution. At a test distance of 30 m, with fuze wavebands in the K, Ka, and V bands and HH polarization, and pitch angles between 30° and 60°, the impact of the jungle background on burst point deviation is within the range of $\pm \mathbf{5} \mathbf{m}$ . The distance distribution of the fuze is 33.5-34.5 m on asphalt surfaces, while it significantly increases to 32–41 m in jungle backgrounds, with a dispersion increase rate of 77%.

关键词： Measurement Accuracy Surface waves Weapons Vegetation Object detection Gaussian distribution Explosions Dispersion Standards

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Dual-functional Metamaterial Device controlled by a Singular Switch

Dual-functional Metamaterial Device Controlled by a Singular...

引用

Progress in Electromagnetic Research Symposium (PIERS)

作者： Yongdiao Wen Gang Li Tie Li Science and Technology on Electromechanical Dynamic Control Laboratory Xi’an China

ISBN: (数字)9798350375909

ISBN: (纸本)9798350375916

Herein, a dual-functional terahertz (THz) metamaterial device is presented, the proposed device consists of two heteromorphic arrows, which can switch freely between absorption and polarization conversion controlled by a singular switch. The absorptivity peak (arounds 1.5 THz) and polarization conversion peak (arounds 2.8 THz) will be changed to polarization conversion peak and absorptivity peak with the state of the singular switch, the absorption function and the polarization conversion function can adjust and convert each other, and the maximum values of absorption rate and polarization conversion rate reach to 87.27% and 95.94% respectively.

关键词： Performance evaluation Electric potential Absorption Switches Conductivity control systems Silicon

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Experiment Research on Echo Characteristics of Pulsed Laser Fuze in Smoke

Experiment Research on Echo Characteristics of Pulsed Laser ...

引用

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

作者： Chi Zhang Sicheng Gao Juntao Cui Tie Li Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

In this paper, a measurement method based on a smoke chamber is proposed to study the backscattering characteristics of pulsed laser fuze in smoke environment. Firstly, the smoke environment was created in a chamber by burning a known amount of smoke agent whose main chemical composition is red phosphorus. Then, a pulsed laser fuze and auxiliary equipments (visibility meters, lambert reflectors, etc) were arranged to collect echo signals. Finally, a statistical method was used to analyze echo characteristics of the pulsed laser fuze. The experimental results show that the laser fuze prototype used in this experiment does not even have the ability to distinguish a target with low reflectivity (5%) from the smoke environment which was created by burning 0.3g smoke agent, and it cannot discriminate a target with high reflectivity (99%) from the smoke environment when the mass of smoke agent is larger than 4g dues to the high smoke particles concentration. The method proposed in this article provides a new feasible means for the research on anti-interference effect evaluation for smoke of pulsed laser fuze.

关键词： Reflectivity Antenna measurements Meters Pulse measurements Atmospheric measurements Statistical analysis Prototypes Particle measurements Phosphorus Laser pulses

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Ultrasonic Wireless Power and Data Transmission technology Across Conical Metal Shell

Ultrasonic Wireless Power and Data Transmission Technology A...

引用

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

作者： Jiemeihui Li Haibin Wang Teng Long Nuoxin Zhang Gan Zhang Yuanting Huang Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an Institute of Electromechanical Information Technology Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

Aiming to address the issue of wireless power and data transmission in closed conical metal shell, the ultrasonic transducer is introduced into the system. The system for ultrasonic transmission is constructed with a pair of radially polarized circular tube transducers, a metal spacer block attached to one of the transducers, and a conical shell. The finite element analysis software COMSOL is utilized to investigate the modal changes in the system during power transmission, while also analyzing the impact of receiving transducer height and relative position on power transmission. Ultrasonic data communication experimental results demonstrate that reliable data can be transmitted across the conical shell using binary frequency shift keying modulation and demodulation techniques at a communication rate reaching 1kbps.

关键词： Wireless communication Ultrasonic transducers Transducers Transmitting antennas Metals Power transmission Acoustics Software reliability Data communication Demodulation

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Attenuation Characteristics of Laser Fuzes in Low-Visibility Dust Environments

Attenuation Characteristics of Laser Fuzes in Low-Visibility...

引用

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

作者： Haichao Zhong Gang Li Bo Tian Yongdiao Wen Wei Li Tie Li Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an Institute of Electromechanical Information Technology Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

To address the issue of multiple scattering in the propagation of laser fuzes in low-visibility dusty environments, an experiment was conducted to measure the transmittance of laser in such conditions. The corresponding attenuation coefficient was derived based on the Beer-Lambert law. The results indicate that in low-visibility conditions, laser energy attenuates more severely in a dusty environment, with the attenuation coefficient decreasing exponentially as visibility decreases. For instance, at a visibility of 50m, the attenuation coefficient is 192dB/km, and at a visibility of 100m, it is 85dB/km. The experimental results were compared with independent scattering Mie theory calculations and Monte Carlo simulations that consider multiple scattering effects. The findings show significant discrepancies between the experimentally measured attenuation coefficients and Mie theory predictions under low-visibility conditions, whereas the differences with Monte Carlo simulation results, which account for multiple scattering and dust particle shape factors, are smaller. However, the Monte Carlo results are still lower than the experimental measurements in low-visibility conditions. The study concludes that when dust visibility is below approximately 200m, laser transmission simulations must consider multiple scattering and other influencing factors.

关键词： Laser theory Monte Carlo methods Atmospheric measurements Shape Shape measurement Scattering Measurement by laser beam Attenuation measurement Attenuation Particle measurements

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