检索结果-内蒙古大学图书馆

15th International Conference on Microwave and Millimeter Wave technology, ICMMT 2023

作者： Lu, Yong-Han Ma, Jing Li, Zhi-Hao Huang, Jia-Jia Mo, Kun-Shan Peng, Lin Guilin541004 China Education Department of Guangxi Zhuang Autonomous Region Guilin541004 China Beijing Simulation Center Science and Technology on Special System Simulation Laboratory Beijing100854 China

ISBN: (纸本)9798350338874

This paper proposes a W-band all-dielectric lens antenna with the characteristic flat-top beam. The lens loaded on the horn is composed of 10 concentric elliptical rings and a tapered matching layer. Its geometries are optimized by the non-dominated sorting genetic algorithm II (NSGA-II). The lens antenna designed at 92-97 GHz achieves a beamwidth of 40° with ripple level less than 1 dB in E-plane and H-plane. In addition, the proposed antenna can be prototyped easily using 3D-printing technology with low cost. © 2023 IEEE.

关键词： Genetic algorithms

来源：评论

学校读者我要写书评

暂无评论

A Probe Set Determination Method Based on Spanning Tree Algorithm 23

A Probe Set Determination Method Based on Spanning Tree Algo...

引用

7th International Conference on High Performance Compilation, Computing and Communications, HP3C 2023

作者： Hongxing, Hao Ronghuan, Yu Jing, Guo Science and Technology on Complex Electronic System Simulation Laboratory Space Engineering University Beijing China

ISBN: (纸本)9781450399883

With the rapid development of network technologies such as the Internet of Things, the scale of networks has gradually increased. The P2P networks have been gradually studied, and fault detection and localization for large-scale networks have become a hot research topic. Generally, probes are usually used to quickly locate the fault nodes, but the ability to locate network faults is determined by the choice of probes. This paper studies the probe set determination problem and proposes the criteria named segmentation entropy to judge the probe set. Then a probe set determination method is proposed which does not require a candidate set and performs better than the random probe selection algorithm. Experimental results proves that the proposed algorithm can quickly obtain excellent probe sets. © 2023 ACM.

关键词： Probes

来源：评论

学校读者我要写书评

暂无评论

A TOPSIS-based Approach to Evaluating Remote Sensing Satellite Mission Planning Schemes

A TOPSIS-based Approach to Evaluating Remote Sensing Satelli...

引用

2022 International Conference on Geographic Information and Remote Sensing technology, GIRST 2022

作者： Liu, Desheng Chang, Qing Yang, Yang Wang, Yi Science and Technology on Complex Electronic System Simulation Laboratory Space Engineering University Beijing China

ISBN: (纸本)9781510662186

Remote sensing satellite mission planning is one of the hot issues in the space engineering research field, and a large number of mission planning approaches have been proposed in related research work. Numerous mission planning schemes were constructed for different mission requirements. How to evaluate the merits of the schemes is of great significance to improve the quality and effectiveness of remote sensing satellite missions. Based on the analysis of the basic problems of remote sensing satellite mission planning, a technology framework of mission scheme evaluation is proposed, and an evaluation index system for remote sensing mission planning schemes is constructed, including mission completion rate, planning timeliness and resources occupancy. A TOPSIS-based evaluation model is proposed to calculate the valuation of mission scheme according to the index system. The case study shows that the mission planning scheme evaluation approach proposed in this paper is feasible and effective. © 2023 SPIE.

关键词： Engineering research

来源：评论

学校读者我要写书评

暂无评论

Research on Requirement Analysis Method of Space Equipment technology system based on capability 7

Research on Requirement Analysis Method of Space Equipment T...

引用

7th IEEE Information technology and Mechatronics Engineering Conference, ITOEC 2023

作者： Jian, Ping Xiong, Wei Liu, Desehng Space Engineering University Science and Technology on Complex Electronic System Simulation Laboratory Beijing China

ISBN: (纸本)9798350334197

"Demand traction and technology promotion"is the main law of equipment system construction and development. Scientific determination and quantitative evaluation of key technologies in the field of military equipment is the key and difficult point of system macro demonstration. Based on the analysis of the technical structure of space information equipment technology, this paper proposes a capability-based requirement analysis framework and process of space information equipment technology system, establishes a requirement analysis model of technology system, and constructs its technical system by taking space situation awareness system as an example. It provides technical basis for the requirement analysis of space information equipment technology system. © 2023 IEEE.

关键词： Construction equipment

来源：评论

学校读者我要写书评

暂无评论

Regularized automatic frequency response function acquisition of a milling robot operating in a high-dimensional workspace

引用

science China(Technological sciences) 2024年第6期67卷 1783-1797页

作者： LUO WenLong TANG XiaoWei MA Tao GUO QiuShuang XU YanYan YUAN Xing ZHANG Lei MAO XinYong School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan430074China State Key Laboratory of Smart Manufacturing for Special Vehicles and Transmission System Baotou014030China Wuhan Heavy Duty Machine Tool Group Corporation Wuhan430205China

Because robotic milling has become an important means for machining significant large parts,obtaining the structural frequency response function(FRF)of a milling robot is an important basis for machining process ***,because of its articulated serial structure,a milling robot has an enormous number of operating postures,and its dynamics are affected by the motion *** accurately obtain the FRF in the operating state of a milling robot,this paper proposes a method based on the structural modification *** the traditional excitation method,the proposed method uses robot joint motion excitation instead of hammering excitation to realize *** address the problem of the lack of information brought by motion excitation,which leads to inaccurate FRF amplitudes,this paper derives the milling robot regularization theory based on the sensitivity of structural modification,establishes the modal regularization factor,and calibrates the FRF *** to the commonly used manual hammering experiments,the proposed method has high accuracy and reliability when the milling robot is in different *** the measurement can be performed directly and automatically in the operation state,and the problem of inaccurate amplitudes is solved,the proposed method provides a basis for optimizing the machining posture of a milling robot and improving machining efficiency.

关键词： milling robot structural dynamics frequency response function automatic identification modal regularization factor high-dimensional workspace

来源：评论

学校读者我要写书评

暂无评论

Hyperspectral Image Anomaly Detection Based on Auto Encoder 4

Hyperspectral Image Anomaly Detection Based on Auto Encoder

引用

4th International Conference on Geoscience and Remote Sensing Mapping, GRSM 2022

作者： Li, Guanzhe Wu, Lingda Hao, Hongxing Science and Technology on Complex Electronic System Simulation Laboratory Space engineering university Beijing China

ISBN: (数字)9781510662179

ISBN: (纸本)9781510662162

The reason for the existence of small targets and sub-pixel targets in hyperspectral images is that the low spatial resolution leads to the phenomenon of mixed pixels, which makes some targets exist in the form of small targets and sub-pixel targets in the image. Moreover, the traditional anomaly detection algorithm introduces the regularization parameter into hyperspectral anomaly detection, but the regularization parameter needs to be manually set and adjusted. However, since the anomaly detection is carried out without prior information, in real situations, it is difficult to obtain the prior information of the target, so the regularization parameter may be difficult to determine. In addition, considering that traditional algorithms are not sensitive to small target pixel targets, a hyperspectral anomaly detection network based on self encoder is designed for hyperspectral images with small targets and sub-pixel targets. © 2023 SPIE.

关键词： Anomaly detection

来源：评论

学校读者我要写书评

暂无评论

A fast calculation method for three-impulse contingency return trajectory during the near-moon phase based on differential algebra

引用

Chinese Journal of Aeronautics 2025年第4期38卷 286-304页

作者： Lin LU Haiyang LI Tianshan DONG Wanmeng ZHOU College of Aerospace Science and Technology National University of Defense TechnologyChangsha 410073China Hunan Key Laboratory of Intelligent Planning and Simulation for Aerospace Missions Changsha 410073China Beijing Institute of Spacecraft System Engineering Beijing 100094China China Astronaut Research and Training Center Beijing 100094China

Aimed at the demand of contingency return at any time during the near-moon phase in the manned lunar landing missions,a fast calculation method for three-impulse contingency return trajectories is ***,a three-impulse contingency return trajectory scheme is presented by combining the Lambert transfer and maneuver at the special ***,a calculation model of three-impulse contingency return trajectories is ***,fast calculation methods are proposed by adopting the high-order Taylor expansion of differential algebra in the twobody trajectory dynamics model and perturbed trajectory dynamics ***,the performance of the proposed methods is verified by numerical *** results indicate that the fast calculation method of two-body trajectory has higher calculation efficiency compared to the semi-analytical calculation method under a certain accuracy *** to its high efficiency,the characteristics of the three-impulse contingency return trajectories under different contingency scenarios are further analyzed *** findings can be used for the design of contingency return trajectories in future manned lunar landing missions.

关键词： Manned lunar landing Contingency return trajectory Trajectory calculation method Differential algebra Trajectory characteristic analysis

来源：评论

学校读者我要写书评

暂无评论

Miniaturization Design of TEM Horn Antenna for Ground-Penetrating Radar 15

Miniaturization Design of TEM Horn Antenna for Ground-Penetr...

引用

15th International Conference on Microwave and Millimeter Wave technology, ICMMT 2023

作者： Li, Zhi-Hao Ma, Jing Wu, Jin Huang, Jia-Jia Lu, Yong-Han Peng, Lin Guangxi Guilin541004 China Education Department of Guangxi Zhuang Autonomous Region Guangxi Guilin541004 China Beijing Simulation Center Science and Technology on Special System Simulation Laboratory Beijing100854 China

ISBN: (纸本)9798350338874

This paper presents a miniaturized TEM horn antenna for ground penetrating radar (GPR). First, an exponential gradient horn antenna is designed with a low cut-off frequency of 0.45 GHz. Then, the low cut-off frequency is decreased to 0.19 GHz through curve structural loading and lens loading without increasing the size of the horn. The antenna size is 378.49 mm × 359.07 mm × 386.06 mm, corresponding to 0.226 λ1 × 0.238 λ1 × 0.243 λ1 ( λ1 is the wavelength corresponding to the lowest frequency of the antenna). The results show that the working bandwidth of the antenna is 0.19-3GHz, and it has a good radiation pattern in the band, with a peak gain of 12.4dBi, which would be a good candidate for GPR. © 2023 IEEE.

关键词： Horn antennas

来源：评论

学校读者我要写书评

暂无评论

One-Dimensional Photonic Crystal Filter with Multiple Defect Layers Based on Particle Swarm Optimization 21st

One-Dimensional Photonic Crystal Filter with Multiple Defect...

引用

21st Asia simulation Conference, AsiaSim 2022

作者： Hao, Kaizi Du, Jian Ma, Jing Zhang, Ying Ma, Yiyuan Wan, Chen Science and Technology on Special System Simulation Laboratory Beijing Simulation Center Beijing100854 China North University of China Taiyuan030051 China

ISBN: (纸本)9789811991974

In this paper, the defect mode of one-dimensional photonic crystal was studied. For photonic crystal with one defect layer, the effects of refractive index and thickness of defect layer, photon period number and incident angle on defect mode were discussed. Photonic crystal structure with multiple defect layers was constructed, and multiple defect modes were obtained in the forbidden band. Based on the photonic crystal structure with two defect layers, a dual-channel narrow-band filter operating at 480 nm and 532 nm was designed. Particle swarm optimization algorithm was introduced to optimize the position and transmittance of defect modes, which mainly depended on the thickness of defect layer. The calculation results showed that the transmittance of the two defect modes reached 97.52% and 97.55%, respectively, while the full width at half maximum was only 1.0 nm and 1.8 nm. The simulation of the electric field distribution further proved the correctness of the design results. The research results had important value in the field of underwater laser communication. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Photonic crystals

来源：评论

学校读者我要写书评

暂无评论

Optimization of radar reconnaissance constellation based on fuzzy relative entropy 6

Optimization of radar reconnaissance constellation based on ...

引用

6th International Conference on Advanced Electronic Materials, Computers, and Software Engineering, AEMCSE 2023

作者： Liu, Yali Xiong, Wei Han, Chi Science and Technology on Complex Electronic System Simulation Laboratory Space Engineering University Beijing101416 China

ISBN: (纸本)9781510668249

The optimization of radar reconnaissance constellation is of great significance for reconnaissance timeliness. In order to solve the problems of insufficient selection pressure and poor diversity of the evolutionary algorithm based on Pareto domination in solving the many-objective optimization problem of radar reconnaissance constellation, an imporved particle swarm optimization based on fuzzy relative entropy (IFREM_PSO) is proposed. A new inertial weight strategy is proposed to enhance the convergence speed and accuracy of the algorithm, improve the external archive maintenance strategy, and enhance the convergence and diversity of the algorithm. The optimization model of radar imaging reconnaissance constellation oriented to area reconnaissance is constructed. The IFREM_PSO is used to optimize the model, and the multi-objective particle swarm optimization algorithm (MOPSO) is used as the control algorithm. Experiments show that the IFREM_PSO has better results in terms of convergence, diversity and convergence speed, and can effectively solve the problem of radar reconnaissance constellation optimization. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Entropy

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：