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检索条件"机构=Science and Technology on Complex System"

共 1613 条记录，以下是151-160 订阅

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CHARACTERISTICS ANALYSIS OF STEPPED FREQUENCY CHIRP SIGNAL USING UNIFORM INTERRUPTED MODULATION

CHARACTERISTICS ANALYSIS OF STEPPED FREQUENCY CHIRP SIGNAL U...

引用

IET International Radar Conference 2023, IRC 2023

作者： Zhao, Tiehua Wu, Qihua Xu, Zhiming Zhao, Feng Xiao, Shunping The State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System College of Electronic Science and Technology National University of Defense Technology Changsha China

ISBN: (纸本)9781839539954

The co-modulation is beneficial for increasing the anti-reconnaissance potential of radar waveform. Stepped frequency chirp (SFC) signal has the characteristics of both linear frequency modulation (LFM) signal and stepped-frequency waveform (SFW). Uniform interrupted modulation (UIM) can increase the complexity of the signal in the time domain. Therefore, the characteristics of the SFC signal with UIM are deduced in this paper. First of all, the processing method of the SFC signal is introduced. Then the characteristics of the SFC signal with UIM are analysed emphatically. The high-resolution range profile (HRRP) of the inter-pulse and intra-pulse interrupted modulation are both deduced respectively. It is concluded that the UIM between pulses brings the HRRP of the SFC signal multiple pseudo peaks extending along the range profile. However, there is no pseudo peak in the HRRP of the intra-pulse interruptedly modulated SFC signal. Signal simulation experiments are carried out with MATLAB to verify the accuracy of the theoretical analysis. © The Institution of Engineering & technology 2023.

关键词： Chirp modulation

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Research on Explainable Recommendation Model Based on Knowledge Graph 19

Research on Explainable Recommendation Model Based on Knowle...

引用

19th IEEE International Conference on Networking, Sensing and Control, ICNSC 2022

作者： Xie, Lijie Jin, Yaqing Cui, Zhihua Wang, Lifang Taiyuan University Science and Technology Complex System and Computational Intelligence Laboratory Taiyuan China

ISBN: (纸本)9781665472432

In order to further obtain the best explanation paths and recommendation items that satisfy the preferences of users accurately and efficiently, a many-objective explainable recommendation model GrEA-ERS based on preferences of users is proposed, which designs pruning strategies to delete unsatisfied paths in knowledge graph based on on preferences of users, so as to reduce the search paths. Combined with the many-objective optimization algorithm GrEA, the paths in knowledge graph are used as decision variables, at which different explained paths correspond to different recommended items, and accuracy, diversity, novelty and explainability are optimized to obtain explained paths and their corresponding recommended items. Through extensive experiments, the model GrEA-ERS always outperforms other algorithms in terms of accuracy, novelty, diversity, and explainability. © 2022 IEEE.

关键词： Recommender systems

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A Region Preference-based Optimization Algorithm for Satellite Mission Planning Problem 2

A Region Preference-based Optimization Algorithm for Satelli...

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2021 2nd International Conference on Modeling, Big Data Analytics and Simulation, MBDAS 2021

作者： Xiong, Minghui Xiong, Wei Science and Technology on Complex Electronic System Simulation Laboratory Space Engineering University China

For the earth observation satellite mission planning problem, objectives such as observed target quantity, observation profit, energy consumption, image quality should be considered simultaneously, which is a many-objective optimization problem. Classical optimization-based mission planning algorithms obtain a set of non-dominated solutions in the entire search space, while only a single satisfy final plan is desired by decision maker. In this paper, a five-objective optimization model for satellite mission planning problem is constructed, then a region preference-based evolutionary algorithm, HMOEA-T, is applied to obtain the desired solutions. The decision makers describe the preference on each objective in target region form, then the algorithm guides a more detailed search within the preference region rather than the entire Pareto front. Comparative studies with preference-based methods (T-NSGA-III) and classical methods (NSGA-III) are conducted. We have exemplified the proposed method manage to obtain the solutions satisfying the mission planning preference and achieve better performance in convergence and diversity. © Published under licence by IOP Publishing Ltd.

关键词： Evolutionary algorithms

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Multi-Stage Marine Ship Recognition Based on Stackable Residual Network 19

Multi-Stage Marine Ship Recognition Based on Stackable Resid...

引用

19th International Conference on Natural Computation, Fuzzy systems and Knowledge Discovery, ICNC-FSKD 2023

作者： Yu, Wanwan Zhang, Junping Wang, Linlin Xi, Yunqiao Xu, Hongfeng Chen, Linxiu Hao, Mingrui Harbin Institute of Technology School of Electronics and Information Engineering Harbin China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing China

ISBN: (纸本)9798350304398

Marine ship recognition has always been an important research field. The ships can be usually recognized by analyzing their attribute characteristics. However, in the actual process of recognition, many ship recognition methods using a single model cannot meet the requirements of this task due to the complexity of ship types, diversity of interference factors and different information obtained from distance differences. Therefore, we propose a multi-stage ship recognition scheme. First, the single radiation emitter feature recognition network model is designed for long-distance recognition. Second, the fusion feature network model for short distance recognition. The proposed network is mainly constructed with the residual units, which not only simplify the training of deep networks and facilitate the spread of information, but also can solve the vanishing gradient and exploding gradient problem. The simulation experimental results show that the proposed network model has better performance than typical methods and has great potential in applications. © 2023 IEEE.

关键词： Ships

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An Efficient Three-Node Beam Element for Large Deformation Analysis Using Absolute Nodal Coordinate Formulation 2nd

An Efficient Three-Node Beam Element for Large Deformation A...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Zhou, Huaqing He, Bin Ren, Hui Cui, Jiang Hao, Feiyu Feng, Yu Rui, Xiaoting Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing China National Key Laboratory of Complex Multibody System Dynamics Nanjing China School of Astronautics Harbin Institute of Technology Harbin China

ISBN: (纸本)9789819980475

An efficient formulation for dynamics of beams with large deformation and large rotation is presented. A large deformation three-node beam element is established, in which the position coordinate is selected as the generalized coordinates in middle node, and the position coordinate and lateral slope vectors are selected as the generalized coordinates in both end nodes. The inertia force and the constant mass matrix of beam element are obtained. Based on the principles of continuum mechanics, the elastic forces and the stiffness matrix are deduced, which are highly non-linear polynomials of the generalized coordinates. The generalize external forces is obtained by virtual work. The stretch, shear, bending, and torsion deformation of slender beams are considered. The Possion’s locking and shear locking do not exist in this formulation. Hilber-Hughes-Taylor (HHT) integration method involved the Jacobian matrix and right-hand side is used to obtain the dynamics results. Numerical example validates the presented approach. The proposed formulation provides an effective tool for dynamics analysis of flexible slender beams, which can be accurately applied to solve the dynamics problem of multibody system with large deformations. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Jacobian matrices

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Multiple UAVs Time-Cooperative Guidance Law Under Directed Communication Topologies

Multiple UAVs Time-Cooperative Guidance Law Under Directed C...

引用

International Conference on Guidance, Navigation and Control, ICGNC 2020

作者： Lyu, Teng Xu, Cheng Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing China

ISBN: (纸本)9789811581540

Collaborative guidance of multiple UAVs with directional communication topologies for directional targets is being researched. First, a new multi-UAV time-cooperative guidance model is established based on the relative motion equation of the UAV target. Next, based on the cooperative control theory of multi-agent systems, a rigorously proven distributed time cooperative guidance method is designed. This ensures that the impact times of multiple UAVs in a directional topology reach asymptotic consistency. After reaching the impact time consensus, all unmanned aerial vehicles use traditional PN guidance techniques to ensure that the UAV accurately hits the target without impacting the impact time consensus. Finally, the simulation results prove the effectiveness of the designed collaborative guidance method. © 2022, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Unmanned aerial vehicles (UAV)

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The Vibration Signal Analysis system of the Ultra-Precision Fly Cutting Machine Tool 2nd

The Vibration Signal Analysis System of the Ultra-Precision ...

引用

2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Ding, Yuanyuan Rui, Xiaoting Wang, Guoping Ding, Jianguo Zhang, Jianshu Lu, Hanjing Chen, Yiheng Chang, Yu Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing China National Key Laboratory of Complex Multibody System Dynamics Nanjing China School of Science Nanjing University of Science and Technology Nanjing China College of Engineering Peking University Beijing China

ISBN: (纸本)9789819980475

The vibration signals of the ultra-precision fly cutting machine tool can reflect the machine tool's state during machining. The accurate analysis of the vibration signals in ultra-precision fly cutting machine tools is of great significance in establishing the relationship between the vibration signals and the machine tool performance. In this paper, a vibration signal analysis system based on LabVIEW is designed for analyzing the measured tool tip vibration signals in the ultra-precision fly cutting machine tool. The analysis of the vibration signals in the time domain, frequency domain, and time–frequency domain is realized. The corresponding relationship between the main vibration frequencies of the tool tip vibration signals in ultra-precision fly cutting machine tool and the machine tool performance is established, which provides a theoretical basis for surface topography prediction, machining parameters optimization, vibration suppression, and structure optimization. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Machine tools

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Method for Evaluating the Performance of Aircraft Collaborative Decision-Making Based on Dynamic Bayesian Network

Method for Evaluating the Performance of Aircraft Collaborat...

引用

2024 International Conference on Electronics and Devices, Computational science, ICEDCS 2024

作者： Zhang, Wenbo Yu, Boxiao Tong, Jiahui Li, Jing Beijing Electro-Mechanical Engineering Institute National Key Laboratory of Complex System Control and Intelligent Agent Cooperation Beijing China Beijing Institute of Technology School of Computer Science and Technology Beijing China

ISBN: (纸本)9798331527624

This research addresses the challenge of assessing equipment decision-making effectiveness in environments characterized by uncertainty and multiple influencing factors. We propose a novel approach involving the creation and optimization of a dynamic Bayesian network-based model tailored for equipment decision-making processes. The model facilitates a systematic evaluation of decision-making effectiveness by incorporating various factors, including equipment performance, environmental conditions, and enemy defensive capabilities. A comprehensive assessment system has been developed to simulate the penetration capabilities of different equipment through enemy defenses. Moreover, this study identifies potential errors in the effectiveness evaluation model by analyzing its performance in typical scenarios, pinpointing areas for enhancement. © 2024 IEEE.

关键词： Decision-making Dynamic Bayesian networks Equipment Simulation Uncertainty Management

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An anti-jamming method based on joint spatial-polarimetric processing for FDA-MIMO Radar 4

An anti-jamming method based on joint spatial-polarimetric p...

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4th International Conference on Signal Image Processing and Communication, ICSIPC 2024

作者： Zhang, Yunhui Pang, Bo Dai, Dahai Tan, Zhengkuan College of Electronic Science and Technology National University of Defense Technology Changsha410073 China State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System National University of Defense Technology Changsha410073 China

ISBN: (纸本)9781510682467

With the continuous development of radar jamming methods and styles, radar systems are facing more and more complex electromagnetic environment, resulting in limited suppression performance through spatial anti-jamming measures solely. In order to solve the problem, this paper proposes an anti-jamming method based on joint spatial-polarimetric processing for Frequency Diverse Array Multiple-Input Multiple-Output (FDA-MIMO) system. Firstly, the signal model of Polarimetric FDA-MIMO (PFDA-MIMO) is established. Based on this model, a joint spatial-polarimetric adaptive filtering method is proposed and experiments are carried out to demonstrate the advantages of joint spatial-polarimetric processing in anti-jamming. Compared to the filtering method that only utilizing the spatial information, this method has a better performance dealing with multidimensional jamming and improves the ability of FDA-MIMO in resisting main lobe jamming. © 2024 SPIE.

关键词： Adaptive filtering

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Algorithm and Software Implementation of Track Chain Automatic Assembly for Tracked Vehicle 2nd

Algorithm and Software Implementation of Track Chain Automat...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Huang, Kai Wang, Pingxin Yang, Fufeng Zhou, Lei Institute of Launch Dynamics Nanjing University of Science and Technology No.200 Xiaolingwei Street Nanjing China National Key Laboratory of Complex Multibody System Dynamics Nanjing China

ISBN: (纸本)9789819980475

With the high-speed improvement of computer processing speed and the continuous development of multibody dynamics commercial software, these softwires has been widely used in the analysis and design of high speed tracked vehicle dynamics. Focusing on the complex modelling of the track subsystem, this paper develops an automated algorithm for assembling the track chain. The contact parameters between the track and the ground and wheels can also be defined easily. Compared with the conventional method of adding track plates and track pins singly using generic modules, this approach greatly improves the modeling speed of the tracked vehicle running system. Finally, the reliability of this method is verified by the simulation of an actual tracked vehicle. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Tracked vehicles

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