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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Wang, Yanke Su, Zhong Chu, Sirui Ling, Zhongao Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781837242672

Autonomous injection of signals to generate ground current field technology is used to realize signal transmission by injecting signals into the ground to form a ground current field. In this paper, horizontal double electrodes are used to inject the signal into the ground, and the model of the ground equivalent electrical network is established according to the circuit characteristics, and the signal transmission characteristics are simulated and analyzed. In order to verify the penetration ability of different signals, square wave, sine wave and triangle wave are injected into the ground, and the signals are received at 13m and 18m and processed and analyzed. The results show that the square wave has the best penetration, followed by the sine wave and finally the triangle wave, which is consistent with the simulation results and verifies the accuracy of the model and the signal penetration ability in the medium. © The Institution of Engineering & technology 2024.

关键词： Equivalent circuits

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A X/Ka-Band Low-Profile Double-Conical-Beams Antenna with Vortex Electromagnetic Waves

A X/Ka-Band Low-Profile Double-Conical-Beams Antenna with Vo...

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2023 IEEE MTT-S International Wireless Symposium, IWS 2023

作者： Qin, Dongjie Li, Weishan Ma, Jie Zang, Yiping Zhao, Xu Xi'an Institute of Electromechanical Information Technology Xi'an710065 China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an710065 China

ISBN: (纸本)9798350336535

Antennas with conical beams have the advantage in anti-interference applications. This paper proposes a low-profile antenna with two conical beams working at X and Ka bands. To save space, a Ka-band multi-ring antenna composed of one circular plate and five concentric rings is placed on the center of an X-band uniform circular array (UCA) antenna formed by eight microstrip patches. A vortex electromagnetic wave (VEW) with mode 1 is generated with the UCA antenna with phase difference of the elements of 45 deg. With different phase difference, the higher modes of the VEW can be formed. The cylindrical cavity not only serves as the cavity of the Ka-band antenna, but also physically separates the two antennas which makes them do not interference with each other. The peak gain at 37.5GHz of Ka band is 12.4dBi, and the 3dB beamwidth is in the range of 6.9-24.4deg. The peak gain at 10GHz of X band is 8.2dBi, and the 3dB beamwidth is in the range of 12.8-43deg. © 2023 IEEE.

关键词： Vortex flow

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A Spatial Modes Filtering FETD Method for 3-D Periodic Structures

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Applied Computational Electromagnetics Society Journal 2025年第2期40卷 96-102页

作者： Wang, Yixin Wei, Bing Fan, Kaihang He, Xinbo Zhao, Sihan Department of Information Technology Shaanxi Police College Xi’an710021 China School of Physics Xidian University Xi’an710071 China School of Information and Communications Engineering Xi’an Jiaotong University Xi’an710049 China Science and Technology on Electromechanical Dynamic Control Laboratory Xi’an710065 China

– A spatial modes filtering (SMF) finite-element time-domain (FETD) method with periodic boundary condition (PBC) is proposed for efficiently analyzing the electromagnetic characteristics of 3-D periodic structures with partial fine structures. The system matrices of FETD become asymmetrical because of the introduction of PBC, which prevents the system eigenvalue analysis. By decomposing the system matrix into PBC-independent and PBC-related parts, the unstable spatial modes under the given large time step can be found and removed from the symmetrical PBC-independent system matrices. Then the system matrix equation and time marching of the SMF-FETD and SMF-FETD method based on local eigenvalue solution (LES-SMF-FETD) with PBC are obtained. Numerical results illustrate the efficiency and effectiveness of the SMF-FETD method with PBC based on non-uniform mesh for analyzing the transport properties of 3-D periodic structures. © ACES.

关键词： Eigenvalues and eigenfunctions

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Anti-jamming Method of Radio Fuze Based on KNN 4

Anti-jamming Method of Radio Fuze Based on KNN

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4th International Conference on Intelligent control, Measurement and Signal Processing, ICMSP 2022

作者： Liu, Bing Hao, Xinhong Yang, Jin Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China

ISBN: (数字)9781665486583

ISBN: (纸本)9781665486583

In order to improve the anti-jamming ability of radio fuze and maximize the effectiveness of radio fuze in complex electronmagnetic environments, it is necessary to distinguish targets and jamming signals effectively. This research takes a sample of FM radio fuze as an example, mainly considers the sine amplitude modulation frequency-sweeping (Sine-AM) jamming signal and noise amplitude modulation frequency-sweeping (Noise-AM) jamming signal, which are pose the greatest threat to the FM radio fuze. The frequency exponential entropy and norm entropy of the fuze output signal are extracted. Then these features are input to K nearest neighbors classifier, in this way, the target signals and jamming signals can be effectively distinguished, Further improved the FM radio fuze ability to anti-jamming signal. The expermient result shows that using KNN classifier can get a classification accuracy more than 99%. © 2022 IEEE.

关键词： Amplitude modulation

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Design and experimental study of a novel piezoelectric accelerometer 4

Design and experimental study of a novel piezoelectric accel...

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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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Blind frequency estimation of pseudo-code phase and linear frequency modulation composited fuze by Duffing oscillator 55

Blind frequency estimation of pseudo-code phase and linear f...

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55th International Conference on Vibroengineering

作者： Guan, Enming Yan, Xiaopeng Lv, Minghui Wan, Yi Chen, Yanjun Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China

In order to blind estimate pseudo-code (PN) code phase modulation and linear frequency modulation composited fuzecarrier frequency. By improving the traditional Duffing oscillator detection model of strong reference signal, an approximate carrier frequency blind estimation method by small-scale periodic Duffing oscillator is proposed in this paper. In this method, the internal dynamic frequency is used to approximate the changes of the output time domain and phase diagram of the chaotic system during the frequency to be measured. Then calculate the different frequency to blind estimate the carrier frequency of the signal. This method widens the range of frequency detection and can realize blind frequency estimation with less prior knowledge. The parameter estimation effect of the approximate carrier frequency estimation method based on small cycle Duffing oscillator under different signal to noise ration (SNR) is simulated and analyzed in this paper. The results show that this method has better parameter estimation performance than the traditional composited fuze frequency estimation method, especially in the environment of low SNR. © 2022 JVE International. All rights reserved.

关键词： Frequency estimation

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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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LIGHTWEIGHT MARS SURFACE DETECTION ALGORITHM BASED ON IMPROVED YOLOV7 10

LIGHTWEIGHT MARS SURFACE DETECTION ALGORITHM BASED ON IMPROV...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Liu, Jingwei Dai, Juan Tian, Kaiyuan Sun, Kedong Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science & Technology University Beijing China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing China School of Automation Beijing Information Science & Technology University Beijing China

ISBN: (纸本)9781837242672

Mars surface detection is a challenging task that takes into account environmental factors such as terrain complexity, ground flatness, rock distribution, geological features, and storms. In this paper, we address the complexity of rock distribution on the surface of Mars and the resource-constrained difficulties of intelligences in performing the task, and propose the Yolov7-MFGC model on top of Yolov7, which solves the problems of existing rock detection models in terms of large computational load and number of parameters, as well as resource constraints in a specific environment. In this paper, we use a homemade Mars surface rock dataset for training and testing, and the test results show that Yolov7-MFGC improves the accuracy by 1.7%, reduces the amount of parameters by 49%, shrinks the model volume by 49.6%, and reduces the GFLOPS by 70% compared with Yolov7. Therefore, it can be concluded that Yolov7-MFGC is able to better perform the Mars surface rock detection task. © The Institution of Engineering & technology 2024.

关键词： Martian surface analysis

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Optimization design and implementation of a novel dual-channel triangular planar capacitive sensor 9

Optimization design and implementation of a novel dual-chann...

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9th International Conference on Electromechanical control technology and Transportation, ICECTT 2024

作者： Cheng, Biyao Wang, Xiaozhuo Zhang, Yaru Yang, Bo Wang, Yiming Li, Yuwei Xi’an Institute of Electromechanical Information Technology Xi’an710065 China Science and Technology on Electromechanical Dynamic Control Laboratory Xi’an710065 China Henan Institute of Metrology Zhengzhou450000 China

ISBN: (纸本)9781510682399

In this paper, a new type of dual-channel triangular planar capacitive sensor is proposed, which can overcome the problems of small dynamic detection range and low sensitivity in nondestructive testing (NDT) applications. By establishing a three-dimensional simulation model of the sensor, the influence of structural parameters such as excitation electrode, shielding electrode, protective electrode, and thickness of substrate on its various performance indicators was systematically analyzed using ANSOFT finite element analysis (FEA) software. By studying the corresponding relationships between different performance indicators and structural parameters, a mathematical relationship between penetration depth and electrode structural parameters was established, and the general design principles and methods for dual-channel triangular planar capacitive sensors were determined. Finally, through experimental verification, it was proven that the theoretical analysis results were consistent with the experimental results, providing a theoretical basis for the optimization design and application of the dual-channel triangular planar capacitance sensor. © 2024 SPIE.

关键词： Partial pressure sensors

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