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检索条件"机构=Science and Technology on Electromechanical Dynamic Control Laboratory"

共 506 条记录，以下是161-170 订阅

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

Smoke Diffusion Feature Extraction and Concentration Predict...

引用

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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Investigation on Effect from variational Electromagnetic Parameters of absorbing patch for RCS of Almond model

Investigation on Effect from variational Electromagnetic Par...

引用

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

作者： Wei Li Tie Li Dengdian Huang Yue Xie Science and Technology on Electromechanical Dynamic Control Laboratory Xian China

ISBN: (纸本)9781665418133

The RCS of the almond model which was affected by the change from electromagnetic parameters (ε and $\mu)$ of the absorbing patch was researched, and the moment method was utilized. The $\varepsilon$ andμ of the absorbing patch can be measured and the values were assumed to vary with equal difference in the interval of 5%~30%, the measured values of $\varepsilon$ and $\mu$ worked as variable which were used to calculate the RCS of the almond model with the different $\varepsilon$ and $\mu$ of the patch. Here, two almond model RCS were obtained, one is circumferential RCS which generated by the gradient of $\varepsilon$ and $\mu$ of absorbing patch, and the other Radar Cross-Section (RCS) generated by the known electromagnetic parameter measurements. Comparing the two RCS mentioned above, the calculated results show that for the HH polarization, the undulation values of the almond model RCS vary within 0.4dB when the real part of $\varepsilon$ and $\mu$ of the absorbing patch vary within 5%-30% at 10GHz, and for the VV polarization, the undulation values changes within 2.5 dB, Moreover, the polar differences of both polarizations decrease with the increase of the real part of the $\varepsilon$ and $\mu$ , in both polarization modes, the polar RCS is sensitive to the variation of $\varepsilon$ and $\mu$ , and the VV polarization is much more sensitive than the HH polarization.

关键词： Analytical models Radar cross-sections Antenna theory Electromagnetic scattering Electromagnetics Method of moments

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

Measurement of Millimeter Wave Transmission Characteristics ...

引用

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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Application of Target Electromagnetic Scattering Characteristics in Short-Range dynamic Detection

Application of Target Electromagnetic Scattering Characteris...

引用

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

作者： Wenhui Hu Gang Li Wei Li Bo Tian Tie Li Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (纸本)9781665418133

In view of the way that radio fuse probe target for echo information with dynamic scanning detection in the scene of near-field, this paper designed an experiment of the application scheme, which the scheme used radar to image electromagnetic scattering from a target of interest, the complex echo signals in the detection results were divided according to the time series and the RCS mean value of the corresponding region was calibrated, thus the time-resolved/part-resolved target information can be used in the design and verification of near-field detector, providing a new method for the application of target characteristic information in the process of short-range dynamic detection.

关键词： Radar cross-sections Fuses Antenna theory Time series analysis Radar detection Detectors Radar scattering

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An environment monitoring system based on wireless sensor networks

引用

2013 International Conference on Advances in Materials science and Manufacturing technology, AMSMT 2013

作者： Liu, Jin Li, Lian Jie Liu, Yu Xin Key Laboratory of Electromechanical Dynamic Control Beijing 100081 China School of Mechatronical Engineering Beijing Institute of Technology Beijing 100081 China

ISBN: (纸本)9783037857984

Based on the wireless sensor network technology, an environmental monitoring system with localization and magnetic detection capabilities is developed for unattended remote environment monitoring and control. In the system, monitoring nodes adopt the CC2420 to build a low-power, short-range jump, self-organizing wireless network, and the gateway node uses the GPRS technology to link the front monitoring network to the rear monitor center. Meanwhile, a component-based software framework is provided to facilitate the protocol implement and to improve expansibility. The experiment demonstrates that the supervisory system can realize the environmental control duty and has a good application value. © (2013) Trans Tech Publications, Switzerland.

关键词： Environmental management

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Design, Optimization and Performance Analysis of Permanent Magnet Synchronous Generator for Fuze

Design, Optimization and Performance Analysis of Permanent M...

引用

2023 IEEE International Conference on control, Electronics and Computer technology, ICCECT 2023

作者： Guo, Zhaoxuan He, Guanglin Ma, Guangsong Zhang, Yulong Qiao, Zenghui Beijing Institute of Technology Science and Technology on Electromechanical Dynamic Control Laboratory Beijing China Xi'An Institute of Electromechanical Information Technology Xi'an China Beijing Electro-Mechanical Engineering Institution Beijing China PLA Strategic Support Force Tianjin China

ISBN: (纸本)9798350399028

In order to solve the power supply problem of the fuze on the small-caliber projectile and improve the reliability of the fuze power supply, a miniaturized fuze turbine permanent magnet synchronous generator (PMSG) is designed in this paper, which is a physical power supply driven by wind. In order to improve the electromagnetic performance of the design schemes, this paper proposes a methodology based on dimensional parameters optimization, optimizes the design parameters based on the Rotational Motor Expert (RMxprt) module, and then conducts electromagnetic performance analysis based on the Maxwell 2D module. Finally, according to the performance parameters, the scheme with 6-pole 9-slot mode is selected among the two schemes with different pole-to-slot ratio, its load line voltage is 21.53 V, and the rated load output power is 47.15 W, which meets the design requirements. © 2023 IEEE.

关键词： Permanent magnets

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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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Sea Surface Scattering Characteristics Based on Slope Statistics of Sliding Window

Sea Surface Scattering Characteristics Based on Slope Statis...

引用

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

作者： Yue Xie Tie Li Bo Tian Tuan Li Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (纸本)9781665418133

In view of the insufficient applicability of the current engineer laser short-range sea surface scattering echo related calculation model, it is impossible to effectively evaluate the performance of the system under different conditions, the simulated wave pool environment is used to obtain the detection system at a fixed height and attitude. Data has limitations such as limited sample points and high funding. This paper proposes a sea surface scattering echo model based on three-point sliding window function statistics. By discretizing the sampling of the wave cross section and obtaining the slope statistics under different intersection conditions, the ray tracing method and the slope value are used to determine the effective surface element. The statistical value of the detection probability and the value of the SNR interval under different sea conditions and attitude angles are obtained by simulation, this provides adaptability assessment and related technical index reference for laser short-range sea surface detection.

关键词： Sea surface Laser theory Laser radar Surface waves Power lasers Scattering Surface emitting lasers

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

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

引用

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

作者： Lei Xia Liang Dai Jin–long Zou Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (纸本)9781665418133

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.

关键词： Analytical models Atmospheric modeling Design methodology Measurement by laser beam Reliability theory Reliability engineering Laser modes

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