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

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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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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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Error Modeling Method for BeiDou Satellite Receivers Based on Long Short-Term Memory Neural Networks 24

Error Modeling Method for BeiDou Satellite Receivers Based o...

引用

Proceedings of the 2024 4th International Conference on Computational Modeling, Simulation and Data Analysis

作者： Boda Li Hongsen Ji Guotai Xu Keyu Qi Ziyang Lin Shuo Zhang Xi'an Institute of Electromechanical Information Technology Xi'an Shaanxi China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an Institute of Electromechanical Information Technology Xi'an Shaanxi China School of Mechatronical Engineering of Beijing Institute of Technology Beijing China Liao Shen Industries Group Co LTD Shenyang Liaoning China

ISBN: (纸本)9798400711831

In response to the influence of errors in the BeiDou satellite receiver on the precision correction fuze in two-dimensional correction munitions during accurate weapon strikes, this study proposes a BeiDou satellite receiver positioning error compensation model based on Long Short-Term Memory (LSTM) networks. By analyzing radar data from flight tests and the measurement data retrieved from recovered projectiles, the receiver error sequence is isolated. Considering the relationship between the receiver and its dynamic characteristic parameters, an error prediction model based on LSTM is established. The model takes the dynamic characteristic parameters of Beidou satellite receiver as input and the error sequence of each dynamic parameter as output to supplement the missing error sequence and compensate the error. The results show that the model can effectively predict receiver errors and reduce the maximum errors of position and speed. Through Monte Carlo simulation, error compensation effectively improves the accuracy of projectile correction, and verifies the effectiveness of the model. This error compensation method can effectively improve the accuracy and combat effectiveness of two-dimensional trajectory correction control

关键词： BeiDou satellite receiver

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Dual-Band Flexible Terahertz Sensor Based on Rotated Metamaterial Structure

Dual-Band Flexible Terahertz Sensor Based on Rotated Metamat...

引用

IEEE International Wireless Symposium (IWS)

作者： Dongxu Wang Kai-Da Xu School of Information and Communications Engineering Xi'an Jiaotong University Xi'an China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai

In this article, a terahertz flexible metamaterial sensor with dual-band operating characteristics is introduced. The gold metamaterial array is arranged on the top surface of a polyimide film, while the structure is made up of a rotated structure with spiral-shaped strips. Two resonances occur at 0.37 and 1.13 THz with outstanding polarization insensitivity. The metamaterial sensor also has sensitive refractive index sensing properties, with sensitivities of 0.1 THz/RIU and 0.3 THz/RIU, respectively, at the two operating bands. This work shows potential applications in refractive index and nesticide sensing.

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Reliability-aware control of Power Converters in Mobility Applications

Reliability-aware Control of Power Converters in Mobility Ap...

引用

European control Conference (ECC)

作者： Amin Rezaeizadeh Gioele Zardini Emilio Frazzoli Silvia Mastellone Institute of Electric Power Systems University of Applied Science Northwest Switzerland Windish Switzerland Laboratory for Information and Decision Systems Massachusetts Institute of Technology Cambridge MA USA Institute for Dynamic Systems and Control ETH Zürich Switzerland

ISBN: (数字)9783907144107

ISBN: (纸本)9798331540920

The large scale adoption of Battery Electric Vehicles (BEVs) is still limited by cost, reliability and lifetime considerations. The power converters of a BEVs, and more specifically the semiconductor switching devices, are the second most likely component to fail due to the damage caused by the current-induced temperature cycling. In this paper we address the active mitigation of damage in e-mobility power converters, by introducing a novel frequency-domain speed controller for the power train that reduces the thermal stress on the power electronic Insulate Gate Bipolar Transistors (IGBTs), while simultaneously ensuring effective speed tracking performance. We integrate the multi-objective problem in an $\mathcal{H}_{\infty}$ control framework, which embeds the semiconductor reliability model in the weights functions. The method is tested using standardised driving cycles in two different scenarios: reliability-aware, and performance-oriented cases. Finally a lifetime analysis of the IGBTs, in both scenarios is performed leveraging the Rainflow algorithm and temperature data.

关键词： Insulated gate bipolar transistors Degradation Temperature distribution Switches Insulation life Temperature control Reliability

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Application of Ulaby Model in Simulation of Altimeter Fuze

Application of Ulaby Model in Simulation of Altimeter Fuze

引用

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

作者： Sicheng Gao Tie Li Wei Li Bo Tian Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an Shaanxi China

ISBN: (纸本)9781665418133

In order to solve the problem that the application mechanism of scattering information of background of surface features in the design process of altimeter fuze is not clear, a simulation method of altimeter fuze based on Ulaby model is proposed. This method is based on the Ulaby model to model the target characteristics of background of surface features. The target characteristics information is used as the input information of fuze detection in the missile target encounter process, adopting the digital signal processing method. The response characteristic model of fuze target detection is established, and the response simulation of fuze detection to the time-varying scattering characteristics of background of surface features in the process of missile target encounter is carried out, and the response characteristics of echo and IF signal processing are clearly reproduced. The experimental results show that Ulaby model can be used to distinguish different background of surface features types. The target type information is added as another dimensional fuze detection information, and the detection accuracy is further improved by combining the height information.

关键词： Missiles Antenna theory Scattering Object detection Digital signal processing Feature extraction Clutter

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Design of dual band millimeter wave beam shaped array antenna 13

Design of dual band millimeter wave beam shaped array antenn...

引用

13th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2021

作者： Wen, Rui-Hu Chen, Wei Cao, Xue-Qi Wang, Jing-Ya Niu, Lan-Jie Ma, Meng-Xin Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an710065 China Xi'an Institute of Electromechanical Information Technology Xi'an710065 China Shaanxi Applied Physics and Chemistry Rescarch Insittute Xi'an710061 China

ISBN: (纸本)9781665418126

Aiming at the requirement of dual-channel dual-band millimeter wave for high-frequency radio fuze determination, a miniaturized dual-band microstrip beam-shaped array antenna which consists of six patch radiation units and microstrip feed network is designed. Independent adjustment of the two working frequency bands can be achieved by adjusting the size of the patch and the length of the slot. © 2021 IEEE.

关键词： Millimeter waves

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V-band antipolar fin line microstrip waveguide conversion structure

V-band antipolar fin line microstrip waveguide conversion st...

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

作者： Wei Chen Rui-Hu Wen Xiao-Yan Zheng Shui-Ying Liu Lan-Jie Niu Science and Technology on Electromechanical Dynamic Control Laboratory Xi'anChina710065

ISBN: (纸本)9781665418133

The V-band microstrip waveguide conversion structure cannot meet the requirements of simple installation and integrated design. The fin line structure with specific size and shape is etched on the surface of the film. By adjusting the parameters of the opposite pole fin line, the conversion structure can meet the requirements of practical performance. The test results show that the center frequency of antipolar fin line microstrip waveguide conversion structure is 71.6GHz, the internal reflection parameter S11 is less than -20dB in the bandwidth of 67.3-77.0GHz and 10GHz, and the conversion structure size is 6.56mm*1.47mm*0.127mm. The conversion structure is installed in the middle of the V-band waveguide along the E-plane of the waveguide, without slotting the waveguide wall, which meets the requirements of superior performance, simple installation and integrated design.

关键词： Surface waves Shape Waveguide theory Microstrip antennas Integrated design Frequency conversion Reflection

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Deep Reinforcement Learning-Based Cooperative Guidance Law with Multi-Constraint

Deep Reinforcement Learning-Based Cooperative Guidance Law w...

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Chinese Automation Congress (CAC)

作者： Zhihao Gao Junfang Fan Denghui Dou Yi Ji Yafeng Li Jinmin Wu Beijing Key Laboratory of High Dynamic Navigation Technology School of Automation Beijing Information Science and Technology University Beijing China Beijing Key Laboratory of UAV Autonomous Control School of Aerospace Engineering Beijing Institute of Technology Beijing Institute of Technology Beijing China School of Automation Beijing Information Science and Technology University Beijing China

To enhance the destructive capabilities of small air-to-surface missiles, it is necessary to address the challenges related to terminal attack angle constraints and multi-missile coordinated attacks, we propose a cooperative guidance law with multi-constraint based on deep reinforcement learning in this paper. Firstly, an intelligent control term is introduced into the biased proportional navigation law with angle constraints. Secondly, a reward function is designed to reduce terminal attack angle error and flight time error, ensuring that the missile successfully reaches the target within the expected flight time, while simultaneously converging the attack angle to the desired value. Finally, the deep deterministic policy gradient algorithm is employed for the purpose of training and generating intelligent guidance instructions. Simulation results substantiate the efficacy of the devised guidance method in achieving accurate target strikes, both for individual missiles and in scenarios involving multiple missiles. And exhibiting better stability and guidance accuracy compared to the traditional biased proportional navigation law.

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A Deep Reinforcement Learning-Based Guidance Law with Impact Angle Constraint

A Deep Reinforcement Learning-Based Guidance Law with Impact...

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Chinese Automation Congress (CAC)

作者： Xu Wang Junfang Fan Denghui Dou Yi Ji Yafeng Li Jinmin Wu School of Automation Beijing Information Science and Technology University Beijing Key Laboratory of High Dynamic Navigation Technology Beijing China School of Aerospace Engineering Beijing Institute of Technology Beijing Key Laboratory of UAV Autonomous Control Beijing Institute of Technology Beijing China School of Automation Beijing Information Science and Technology University Beijing China

Addressing the challenge of ineffective impact angle control when employing conventional biased proportional navigation guidance for precision-guided missiles against maneuvering targets, this study proposes a guidance law with impact angle constraint by integrating deep reinforcement learning algorithms with biased proportional navigation guidance. The algorithm enhances traditional proportional navigation guidance by introducing a target maneuver compensation bias term. This bias term is treated as an action in a learning framework and optimized using the Proximal Policy Optimization algorithm. Simulation experiments validate that the proposed algorithm, compared to conventional proportional navigation guidance, not only reduces miss distance and impact angle error but also shortens flight time.

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