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4th International Conference on Sensors and Information technology, ICSI 2024

作者： Zou, Qipeng Sui, Li Zhang, Meiyun Zhang, Li Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing100081 China Northwest Industries Group Co. Ltd. Xi'an710043 China

ISBN: (数字)9781510678699

ISBN: (纸本)9781510678682

The collision or penetration overload signal measured by the general accelerometer may encounter problems such as signal overlap and multi-layer signal adhesion. This paper designs a novel piezoelectric accelerometer with the characteristics of mechanical filtering and switching. The structure and working principle of this accelerometer are described in the paper, and its output characteristics are obtained through experiments. The experimental results show that the output signal of the new piezoelectric accelerometer has the characteristics of less high-frequency interference signal and no signal adhesion, which are conducive to the information extraction of collision and penetration multi-layer target by the flying carrier. © 2024 SPIE.

关键词： Accelerometers

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A Multi-Layer Frequency Selective Surface with Broad Bandpass and High Selectivity

A Multi-Layer Frequency Selective Surface with Broad Bandpas...

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2024 IEEE International Conference on Computational Electromagnetics, ICCEM 2024

作者： Gao, Ruicheng Wen, Shuai Mao, Yongyan Bi, Lige School of Electronic Engineering Xidian University Xian China Science and Technology On Electromechanical Dynamic Control Laboratory China Electronic Engineering Research Institute Xian China

ISBN: (纸本)9798350383317

A novel broadband bandpass Frequency Selective Surface (FSS) is designed with the intention of surpassing the performance of previous designs. Through the utilization of cascading multilayers of capacitive patches and inductive grids, this design achieves our goal of wide bandwidth as well as high selectivity, while maintaining an acceptable thickness. The stimulated results exhibit a broad passband width, ranging from 12.5 GHz to 18.2 GHz, as well as steep out-of-band attenuation with a transitional zone of less than 1 GHz. © 2024 IEEE.

关键词： Frequency selective surfaces

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Blind parameter estimation of pseudo-random binary code-linear frequency modulation signal based on Duffing oscillator at low SNR

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Chinese Physics B 2021年第5期30卷 312-319页

作者： Ke Wang Xiaopeng Yan† Ze Li Xinhong Hao Honghai Yu Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical EngineeringBeijing Institute of TechnologyBeijing 100081China

Conventional parameter estimation methods for pseudo-random binary code-linear frequency modulation(PRBC-LFM)signals require prior knowledge,are computationally complex,and exhibit poor performance at low signal-to-noise ratios(SNRs).To overcome these problems,a blind parameter estimation method based on a Duffing oscillator array is proposed.A new relationship formula among the state of the Duffing oscillator,the pseudo-random sequence of the PRBC-LFM signal,and the frequency difference between the PRBC-LFM signal and the periodic driving force signal of the Duffing oscillator is derived,providing the theoretical basis for blind parameter *** based on amplitude method,short-time Fourier transform method,and power spectrum entropy method are used to binarize the output of the Duffing oscillator array,and their performance is *** pseudo-random sequence is estimated using Duffing oscillator array synchronization,and the carrier frequency parameters are obtained by the relational expressions and characteristics of the difference *** results show that this blind estimation method overcomes limitations in prior knowledge and maintains good parameter estimation performance up to an SNR of-35 dB.

关键词： Duffing oscillator pseudo-random binary code-linear frequency modulation(PRBC-LFM)signal blind parameter estimation low signal-to-noise ratio(SNR)

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Measurement of Millimeter Wave Transmission Characteristics Based on Battlefield Smoke Interference Environment

Measurement of Millimeter Wave Transmission Characteristics ...

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

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

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

In response to the impact of copper powder and smoke interference on millimeter wave transmission characteristics, four band tests were conducted using the same smoke agent equivalent battlefield interference environment, including K-band (24GHz), Ka band (34.5GHz), V-band (61GHz), and F-band (94GHz), to obtain millimeter wave radar echoes and analyze them. The experimental results indicate that: The interference of smoke on millimeter wave transmission has randomness, and as the concentration of smoke increases, the interference ability will gradually become stronger; As the carrier frequency increases, the wavelength gradually shortens and the anti-interference ability gradually improves; Relatively speaking, the interference ability of copper powder on millimeter wave transmission is stronger than that of fine smoke aerosols, but far inferior to that of foil cloud clusters.

关键词： Powders Clouds Wavelength measurement Millimeter wave measurements Transmitting antennas Interference Millimeter wave radar Aerosols Millimeter wave propagation Copper

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Smoke Diffusion Feature Extraction and Concentration Prediction Method Based on Canny Edge Detection

Smoke Diffusion Feature Extraction and Concentration Predict...

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

作者： Yue Xie Hong Su Tie Li Gang Li Yali Hou Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

In the dynamic intersection scene between laser detector and smoke interference, it is difficult to quantitatively describe the smoke state parameter information of laser detection optical path at different times due to the fluidity and randomness of smoke. This paper proposes a smoke diffusion video feature extraction and concentration prediction method based on Canny edge detection. This method extracts high-speed video of smoke diffusion, detects the edge of the video image and segments the smoke area, analyzes and obtains the corresponding relationship between the shielding effect of smoke diffusion, the number of image pixels in the transmission path and the smoke concentration, By extracting the shielding effect of 1, 2, and 4 typical smoke scenes during diffusion, and analyzing the number of image pixels of a certain transmission path of smoke diffusion, the smoke impact in the dynamic intersection scene of the laser detector and smoke interference is quantified. Subsequently, the laser detector dynamic intersection scene and detection beam parameters can be combined to quantitatively describe the relative position of the laser beam in the smoke transmission path and the concentration state estimation in different forms of smoke scenes, providing important support for the time-correspondence of the echo signal and the optimization of the smoke interference algorithm.

关键词： Laser theory Image edge detection Lasers Interference Detectors Prediction methods Feature extraction Laser beams State estimation Optimization

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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...

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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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Nonlinear Spline Prioritization Optimization Adaptive Filter

Nonlinear Spline Prioritization Optimization Adaptive Filter

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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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Experiment Research on Echo Characteristics of Pulsed Laser Fuze in Smoke

Experiment Research on Echo Characteristics of Pulsed Laser ...

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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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Dual-functional Metamaterial Device controlled by a Singular Switch

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

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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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RCS Simulation of Partly Coated Electrically Large Target with SBR Method

RCS Simulation of Partly Coated Electrically Large Target wi...

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

作者： Tiantian Feng Tie Li Gang Li Yongdiao Wen Haijun He Sihan Zhao Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

In this study, radar cross section of electrically large target partly coated with radar absorbing materials has been simulated and analyzed by using shooting and bouncing ray method. First, the simulation results are validated by comparing with multilevel fast multipole method for electrically small objects. Then the radar cross section of electrically large target is calculated and evaluated in three conditions: perfect electric conductor, partly coated and fully coated. The results indicate that part coating plays an equivalent role in a certain range of angles compared with the full coating, which provides a way to reduce cost of coated stealth plane.

关键词： Radar cross-sections Costs Antenna theory Simulation Radar antennas Conductors Radar applications Coatings

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