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

共 368 条记录，以下是81-90 订阅

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A Design on Silicon-Based Millimeter-Wave Low Noise Amplifier Circuits 7

A Design on Silicon-Based Millimeter-Wave Low Noise Amplifie...

引用

7th IEEE International Conference on Electronic Information and Communication technology, ICEICT 2024

作者： Xing, Zikang Liang, Qiuyan Xu, Rui Science and Technology on Electromechanical Dynamic Control Laboratory China Xi'an Institute of Electromechanical Information Technology Xi'an710065 China

ISBN: (纸本)9798350384437

This paper investigates the technology of silicon-based millimeter-wave low noise amplifiers (LNA). The LNA consist of two stages of amplifiers connected in cascade. The first stage circuit achieves low noise performance by utilizing minimum noise input matching. The second stage achieves high gain performance by utilizing high gain output matching.. The LNA in this paper achieves a gain S21 of 16 dB at a center frequency of 36 GHz with a noise figure (NF) as small as 5 dB. © 2024 IEEE.

关键词： Low noise amplifiers

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A Tolerance Precision control Method Based on the Internal and External Double-layer Pressure Screw Limits 4

A Tolerance Precision Control Method Based on the Internal a...

引用

4th International Conference on Defence technology, ICDT 2024

作者： Sun, Chengcheng Ma, Hongping Tian, Zhongwang Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China Xi'an Institute on Electromechanical Information Technology Xi'an China

In order to solve the problem that the assembly axial clearance of large-diameter mechanical trigger fuze delay device is large in the fuze body, a tolerance precision control method based on the internal and external double-layer pressure screw limits is proposed. The internal and external double-layer screw threads constitute two sets of independent redundant dimensional chains in distribution direction and value. The final assembly accuracy of the delay device is adjusted by the internal and external double-layer pressure screw mutually. The minimum coaxiality deviation of assembly can achieve 0 deviation, and the average accuracy of assembly coaxiality is increased by about 30.69%, which has obvious effect in reducing axis eccentricity. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Screw threads

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Segmentation Clustering Algorithm for Point Cloud Processing of Targets on the Ground 3

Segmentation Clustering Algorithm for Point Cloud Processing...

引用

3rd International Conference on Defence technology, ICDT 2022

作者： Huang, Jinbo Zheng, Zhen Zhang, Yifei Zhou, Yu School of Mechanical Engineering Nanjing University of Science and Technology Nanjing210094 China Science and Technology on Electromechanical Dynamic Control Laboratory China

After the ground extraction algorithm, there are multiple objects, including the target in the non-ground point cloud. To effectively extract the features of individual objects and overcome the dependence of the traditional algorithm based on the normal vector and curvature of the region growing point cloud segmentation method on the initial point, the normal vector angle in the neighborhood, and the curvature threshold selection. In this paper, we propose a fast clustering segmentation method for region-growing point clouds based on neighborhood density. The test results show that the point cloud segmentation algorithm proposed in this paper has better performance than the traditional Euclidean clustering point cloud segmentation algorithm and region growing point cloud segmentation algorithm in terms of timeliness and correct segmentation rate. This new segmentation clustering algorithm can quickly implement automatic point cloud clustering segmentation of ground objects. © Published under licence by IOP Publishing Ltd.

关键词： Clustering algorithms

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Joint radar and communication based on piece-wised LFM signals 4

Joint radar and communication based on piece-wised LFM signa...

引用

4th International Conference on Defence technology, ICDT 2024

作者： Wang, Xin Duu, Yingsen Zhang, Xiang Wu, Dan Zhang, Ke Xi'an Institute of Electromechanical Information Technology Xi'an China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

Existing joint radar detection and communication(JDC] systems suffer from high peak-to-average power ratiofPAPR] or distance blind spot zones. In this paper, we present a novel JDC system based on piece-wised linear frequency modulation(LFM] signals. Based on the proposed piece-wised LFM modulation signal, the novel JDC system can achieve linear frequency modulation continuous wave(LFMCW) detection, and the PAPR and blind zone issues are solved. Besides, spread spectrum communication can be simultaneously conducted with the same modulation signal. Simulation results show that the proposed JDC system has similar detection performance to the traditional sawtooth LFMCW detection scheme, and the bit-error rate of communication is less than 10~6 when the the bit rate is 500kbps and the signal-to-noise ratio is 10 dB. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Frequency modulation

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Accurate azimuth estimation method for FMCW radar based on moving arrays

Accurate azimuth estimation method for FMCW radar based on m...

引用

2024 International Conference on Image, Signal Processing, and Pattern Recognition, ISPP 2024

作者： An, Tai Yan, Xiaopeng Han, Yanwen Dai, Jian Wang, Jiawei Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical Engineering Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9781510680425

Addressing the current challenges of weak target azimuth detection and inadequate precision in frequency modulated continuous wave (FMCW) radar systems, this paper proposes a novel method for precise imaging based on a motion array using FMCW radar for accurate range and azimuth estimation. The approach involves the use of a millimeter-wave FMCW radar with a motion array to capture target angular information, leading to a substantial improvement in azimuth estimation resolution, particularly for munitions. Additionally, spatial Fourier transform array signal processing is employed to achieve two-dimensional precise imaging of radar targets, encompassing both range and azimuth dimensions. Experimental results validate the effectiveness of the proposed approach, showcasing an enhanced angular resolution of the millimeter-wave radar, reaching 2.6°. The method demonstrates favorable azimuth estimation outcomes in diverse scenarios, including those involving multiple and planar targets. Overall, the introduced technique significantly elevates the precise detection capability of automotive millimeter-wave radar systems. © 2024 SPIE.

关键词： Radar imaging

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Low SNR FM signal preprocessing method based on low-order cyclic statistics and WVD distribution 2

Low SNR FM signal preprocessing method based on low-order cy...

引用

2nd International Conference on Robotics, Artificial Intelligence and Intelligent control, RAIIC 2023

作者： Li, Jianfeng Huang, Dingkun Yan, Xiaopeng Dai, Jian Beijing Institute of Technology Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical Engineering Beijing100081 China

ISBN: (纸本)9798350328004

In order to solve the problem of poor noise suppression effect and long processing time of FM signal under the condition of low SNR by traditional preprocessing methods, a signal preprocessing method based on low-order cyclic statistics and WVD distribution is proposed. The method firstly calculates the cyclic mean value of incoming wave signal, and then transforms the incoming wave signal domain through IFFT algorithm with variable points. Finally, the time-frequency ridge of the FM signal is obtained by WVD time-frequency analysis, and the binary image transformation is carried out. Through simulation analysis, the time-frequency preprocessing method proposed in this paper can greatly reduce the calculation amount and improve the real-time performance while retaining the accuracy of time-frequency features, and provide effective support for subsequent sorting identification and parameter estimation. © 2023 IEEE.

关键词： Binary images

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Research on Numerical Simulation of the instantaneity of a Mechanical Impact Fuze 4

Research on Numerical Simulation of the instantaneity of a M...

引用

4th International Conference on Defence technology, ICDT 2024

作者： Yang, Shanglin Wang, Yabin Luan, Donglin Guo, Pengda School of Mechatronical Engineering Beijing Institute of Technology Beijing China Science and Technology on Electromechanical Dynamic Control Laboratory China

The instantaneity of a fuze refers to the time interval between the projectile's impact on the target and the completion of detonation. This parameter is a critical indicator for evaluating the performance of ammunition. To investigate the factors influencing instantaneity, a numerical simulation was conducted on the process of a projectile striking a target under different conditions, including impact angle, fuze material, and target material. The simulation results, under 12 different conditions, produced acceleration curves and instantaneity for the firing device. Through the analysis of the results, the study establishes key design principles for the firing device of the fuze: the protection design of the ignition device and the selection of the ignition strategy should consider the maximum and minimum impact angles and target hardness. Choosing an ignition device with a low structural strength or a fuze body material with lower hardness and strength can enhance the fuze's instantaneity The target hardness and impact angle greatly affect the fuze's instantaneity of the fuze, and appropriate structural strength should be selected in the design. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Projectiles

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A range-angle estimation algorithm for array FMCW radar based on spatial and temporal sparse extending

A range-angle estimation algorithm for array FMCW radar base...

引用

2023 International Conference on Image, Signal Processing, and Pattern Recognition, ISPP 2023

作者： Wang, Xinwei Yan, Xiaopeng Han, Yanwen Huang, Dingkun Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical Engineering Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9781510666351

Array frequency modulated continuous wave (FMCW) radar is widely used across various platforms to estimate the range and angle of targets using large bandwidth and array angle measurement technology. However, limited platform space and antenna aperture can make obtaining high-precision angle estimations challenging. To address this, a range-angle estimation algorithm based on spatial and temporal sparse extending is proposed. The algorithm extends the array using a nested array in the spatial domain and a sparse virtual array sampled at different locations through platform movement in the temporal domain. The resulting spatial-temporal extended array is equivalent to a large aperture virtual uniform linear array, improving the angle resolution through difference and spatial smoothing processing. By making full use of spatial and temporal information, this method achieves high-precision angle estimation with fewer array elements. © 2023 SPIE.

关键词： Frequency modulation

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Point Cloud Target Registration Algorithm Based on Local Feature Description 3

Point Cloud Target Registration Algorithm Based on Local Fea...

引用

3rd International Conference on Defence technology, ICDT 2022

作者： Wang, Chengjun Zha, Binting School of Mechanical Engineering Nanjing University of Science and Technology Nanjing210094 China Science and Technology on Electromechanical Dynamic Control Laboratory China

Point cloud data has received extensive attention in the field of target recognition and target tracking due to its rich target information, and point cloud registration is one of the basic tasks in point cloud applications. Aiming at the problem that the feature descriptor in the traditional registration algorithm is complicated to calculate and cannot sufficiently describe the features of the point cloud, this paper proposes a local feature descriptor that integrates the local normal vector angle features, projection distance features, and distribution density features of the point cloud. The feature similarity is introduced to determine the corresponding point pairs between the template point cloud and the target point cloud, and the point cloud registration task is completed based on local feature matching. Experiments show that the feature descriptor in this paper is simple to calculate and can sufficiently describe the local features of the point cloud, a good correspondence between points can be established based on the feature descriptor, and the algorithm has good robustness. The registration algorithm proposed in this paper can provide a reference for the fields of target recognition and target pose estimation, etc. © Published under licence by IOP Publishing Ltd.

关键词： Target tracking

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technology of in situ charge promotes the development of MEMS safety and arming device

Technology of in situ charge promotes the development of MEM...

引用

2012 2nd International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale, 3M-NANO 2012

作者： Jinlong, Zou Xiaojie, Li Yaru, Lei Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China Xi'An Institute of Electromechanical Information Technology Xi'an China

ISBN: (纸本)9781467345897

Based on the reading and the analyzing of relative literatures, this paper introduced basic concepts and fabrication processes of two in situ charge technologies - porous silicon energetic material and converting porous metal to primary explosive based on silicon process, and analyzed the structures and working principles of the micro-donators with two in situ charge technologies. This paper also introduced latest process of explosive train of the MEMS S&A. On these bases, the structure and working principle of silicon MEMS S&A proposed by US army was discussed, and this MEMS S&A is based on in situ charge and suitable for wafer-level mass fabrication. Some views about the development of the silicon MEMS S&A were also put forward. © 2012 IEEE.

关键词： Explosives

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