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Nonlinear correction of terahertz FMCW based on time-domain phase compensation

optics Letters 2025年第8期50卷 2630-2633页

作者： Liang, Bin Shen, Sishi Wang, Tianyi Wang, Yue Hao, Congjing Liu, Defeng Liu, Jinsong Wang, Kejia Yang, Zhengang Wuhan National Laboratory for Optoelectronics School of Optical and Electronic Information Optics Valley Laboratory Huazhong University of Science and Technology Wuhan430074 China Huazhong Institute of Electro-Optics Wuhan430299 China AVIC Beijing Changcheng Aeronautical Measurement and Control Technology Research Institute Beijing101111 China

Terahertz frequency-modulated continuous-wave (THz FMCW) technology has become a widely used nondestructive testing tool due to its imaging and detection advantages. Nonlinearity is one of the most common problems with FMCW technology. This is due to the inability to maintain strict linearity during the high-frequency sweep process, resulting in multiple frequencies in the calculated intermediate frequency (IF) signal. This reduces the detection capability of the system, as the effective frequencies are swamped. This paper proposes a nonlinear correction method based on the time-domain phase compensation technique. The causes of nonlinear distortion are analyzed, and the corrected signal is obtained after phase compensation of the instantaneous time-domain signal. Experimental results obtained froman actual terahertz imaging system proved the effectiveness of the proposed method, achieving precise positioning of three-dimensional objects. The range resolution was improved by an order of magnitude, reaching the theoretical resolution of the experimental system. The method improves the detection accuracy of the system without the need for additional equipment. © 2025 optica Publishing Group.

关键词： Terahertz waves

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Minimum Initial Marking Estimation in Labeled Petri Nets Using Minimum Token Number Prediction

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IEEE Transactions on Automatic control 2025年第5期70卷 3296-3302页

作者： Yue, Hao Xu, Yakun Hu, Hesuan Wu, Weimin Li, Lingxi College of Computer Science and Technology Qingdao266580 China Xidian University School of Electro-Mechanical Engineering Xi'an710071 China Nanyang Technological University School of Computer Science and Engineering College of Engineering 639798 Singapore Zhejiang University State Key Laboratory of Industrial Control Technology Hangzhou310027 China Zhejiang University Institute of Cyber-Systems and Control Hangzhou310027 China Purdue University Elmore Family School of Electrical and Computer Engineering College of Engineering IndianapolisIN46202 United States

This article proposes an approach to addressing the problem of minimum initial marking (MuIM) estimation for labeled Petri nets (LPNs). We introduce the important concept of a label synthesis net for LPNs and develop a method for predicting the minimum number of tokens. By using this prediction method, we develop an algorithm that has polynomial complexity in the length of the observed label sequence for estimating MuIMs. An illustrative example is provided to show the effectiveness and efficiency of our proposed approach. Moreover, experimental results demonstrate its advantage over existing work. Finally, we provide a comparison of some representative studies in the literature for MuIM estimation. © 1963-2012 IEEE.

关键词： Discrete event simulation

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Dynamic attack zone of air-to-air missile after being launched in random wind field

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Chinese Journal of Aeronautics 2015年第5期28卷 1519-1528页

作者： Hui Yaoluo Nan Ying Chen Shaodong Ding Quanxin Wu Shengliang College of Astronautics Nanjing University of Aeronautics and Astronautics Science and Technology on Electro-optic Control Laboratory

A new concept is presented for air-to-air missile which is dynamic attack zone after being launched in random wind field. This new concept can be used to obtain the 4-dimensional （4-D） information regarding the dynamic envelope of an air-to-air missile at any flight time airned at different flight targets considering influences of random wind, in the situation of flight fighters coop- crated with missiles fighting against each other. Based on an air-to-air missile model, some typical cases of dynamic attack zone after being launched in random wind field were numerically simulated. Compared with the simulation results of traditional dynamic envelope, the properties of dynamic attack zone after being launched are as follows. The 4-D dynamic attack zone after being launched is inside traditional maximum dynamic envelope, but its forane boundary is usually not inside traditional no-escape dynamic envelope; Traditional dynamic attack zone can just be reliably used at launch time, while dynamic envelope after being launched can be reliably and accurately used during any flight antagonism time. Traditional envelope is a special case of dynamic envelope after being launched when the dynamic envelope is calculated at the launch time： the dynamic envelope after being launched can be inflt, enced by the random wind field.

关键词： Air-to-air missiles Dynamic attack zone afterbeing launched:Traditional dynamic attackenvelope:Flight dynamics:Flight envelopes Numerical calculationprocedures:Simulation analysis

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Partition region-based suppressed fuzzy C-means algorithm

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Journal of Systems Engineering and electronics 2017年第5期28卷 996-1008页

作者： Kun Zhang Weiren Kong Peipei Liu Jiao Shi Yu Lei Jie Zou Min Liu School of Electronics and Information Northwestern Polytechnical University Science and Technology on Electro-Optic Control Laboratory

Aimed at the problem that the traditional suppressed fuzzy C-means clustering algorithms ignore the real needs of different objects, applying the same suppressed parameter for modifying membership degrees of all the objects, a novel partition region-based suppressed fuzzy C-means clustering algorithm with better capacity of adaptability and robustness is proposed in this paper. The model based on the real needs of different objects is built, making it clear to decide whether to proceed with further determination; in addition, the external user-defined suppressed parameter is automatically selected according to the intrinsic structural characteristic of each dataset, making the proposed method become robust to the fluctuations in the incoming dataset and initial conditions. Experimental results show that the proposed method is more robust than its counterparts and overcomes the weakness of the original suppressed clustering algorithm in most cases.

关键词： shadowed set suppressed fuzzy C-means clustering automatically parameter selection soft computing techniques

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Research of the Network Structure in Beyond-Visual-Range Coordinated Air Combat 7

Research of the Network Structure in Beyond-Visual-Range Coo...

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2016 IEEE Chinese Guidance, Navigation and control Conference (IEEE CGNCC2016)

作者： Zoujie Wuwei Science and Technology on Electro-optic Control Laboratory

ISBN: (纸本)9781467383196

This paper abstracts the beyond-visual-range coordinated air combat entities and their relationships into nodes and edges based on the complex network *** network collaborative structure models are established in several cases which are no synergy,synergy of fires,synergy of sensors(tree/distributed command structure),synergy of sensors and C2(tree/distributed command structure),synergy of sensors,C2 and fires(tree/distributed command structure),synergy of sensors,C2 and fires controlled by AWACS(tree/distributed command structure).This paper analyzes the network effect of the models and the result shows that the networked fire control system is a new fire control system which can meet requirements of the Network Centric Warfare(NCW).The main contribution in this paper is that it introduces the composition and technical characteristics of the networked fire control system,and then it compares the networked fire control system with the traditional fire control system for the weapon *** provides theoretical basis for the study of the subsequent BVRAC synergy.

关键词： Research of the Network Structure in Beyond-Visual-Range Coordinated Air Combat Visual

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Underwater arbitrary ranging based on chirped pulse interferometry with a mode-locked laser

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Journal of Lightwave technology 2025年

作者： Shi, Haonan Zhao, Haihan Xu, Xinyang Zhu, Zhiwei Zhai, Jingsheng Li, Xiaobo Tianjin University School of Marine Science and Technology Tianjin300072 China Research Institute of China Electronics Technology Group Corporation Science and Technology on Electro-Optical Information Security Control Laboratory No. 53 Tianjin300308 China The Chinese University of Hong Kong Department of Mechanical and Automation Engineering Hong Kong999077 Hong Kong Nanjing University of Aeronautics and Astronautics Key Laboratory of Space Photoelectric Detection and Perception Ministry of Industry and Information Technology Nanjing211106 China

Underwater distance measurement and length sensing, as fundamental functions of geoscience, are integrated into underwater robots and vessels in various forms of sensor payloads and play a crucial role in a wide range of remote sensing applications. Advanced laser-based detection systems and algorithms are essential for underwater tasks, such as detecting damage in underwater pipelines and conducting detailed structural health assessments. In this paper, we experimentally demonstrated an arbitrary underwater ranging system by the chirped pulse interferometry with a mode-locked laser. Water's inherent characteristic introduces dispersion, enabling unique distance discrimination. Adjusting the repetition frequency allows us to acquire the interference spectrum. A long fiber delay line, stabilized by the servo-controlled system, eliminates the ranging dead zone. The widest fringe of the interference spectrum, corresponding to an instantaneous repetition frequency, indicates the arbitrary measured distance. Leveraging a charge-coupled device detection module, we achieved an update rate of 13.5 Hz for the interference spectrum. Experimental results show a precise distance difference within 59.8 μm at the 5 m range underwater without the dead zone. © 2025 IEEE. All rights reserved.

关键词： Laser mode locking

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Revisiting the hyperfine interval for the 2s2p PJ3 state in Be9

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Physical Review A 2025年第4期111卷 042819-042819页

作者： Yu-Shan Zhang Wei Dang Kai Wang Yong-Bo Tang Hebei Key Lab of Optic-electronic Information and Materials The College of Physics Science and Technology Hebei University Baoding 071002 China Physics Teaching and Experiment Center Shenzhen Technology University Shenzhen 518118 China Department of Physics Anhui Province Key Laboratory for Control and Applications of Optoelectronic Information Materials Key Laboratory of Functional Molecular Solids Ministry of Education Anhui Normal University Wuhu Anhui 241000 China

By using the relativistic multiconfiguration Dirac-Fock method, we calculate the hyperfine-structure properties of the 2s2pPJ3 state in Be9. The hyperfine-structure properties encompass first-order hyperfine-structure parameters, as well as second-order and third-order corrections caused by the off-diagonal hyperfine interaction. Based on our theoretical results, we reanalyze the previously reported measurement of the hyperfine interval for the 2s2pP3 state in Be9 [A. G. Blachman and A. Lurio, Phys. Rev. 153, 164 (1967)], yielding updated hyperfine-structure constants. Our results show that the hyperfine-structure constant B of 2s2pP13 is notably sensitive to second-order correction. Conversely, accurately determining the hyperfine-structure constant B of 2s2pP23 necessitates consideration of the magnetic octupole hyperfine interaction in the first-order hyperfine interaction equation. The updated hyperfine-structure constant B of the 2s2pP23 state is found to be 1.4542(67) MHz, which is approximately 1.7% larger than the previous value of 1.427(9) MHz [A. G. Blachman and A. Lurio, Phys. Rev. 153, 164 (1967)]. By combining our theoretical results with the updated hyperfine-structure constant for the 2s2pP23 state, we extract the electric quadrupole moment Q of Be9 nucleus to be 0.05320(50) b. This value is consistent with the most recent determination using the few-body precision calculation method [Puchalski et al. Phys. Rev. Res. 3, 013293 (2021)]. Additionally, we discuss the reasons for the discrepancy between the electric quadrupole moment Q obtained through few-body and previous many-body calculations.

关键词： Relativity

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Multi-service collaboration and composition of cloud manufacturing customized production based on problem decomposition

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International Journal of Advanced Manufacturing technology 2025年第5期138卷 2157-2171页

作者： Yue, Hao Wu, Yingtao Wang, Min Hu, Hesuan Wu, Weimin Zhang, Jihui College of Computer Science and Technology China University of Petroleum (East China) Qingdao 266580 China College of Information Engineering Yangzhou University Yangzhou 225127 China School of Electro-Mechanical Engineering Xidian University Xi’an 710071 China School of Computer Science and Engineering College of Engineering Nanyang Technological University Singapore 639798 Singapore State Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou 310027 China Institute of Cyber-Systems and Control Zhejiang University Hangzhou 310027 China Institute of Complexity Science School of Automation Qingdao University Qingdao 266071 China Shandong Key Laboratory of Industrial Control Technology Qingdao 266071 China Shandong Key Laboratory of Intelligent Oil & Gas Industrial Software Qingdao 266580 China

Cloud manufacturing system is a service-oriented and knowledge-based one, which can provide solutions for the large-scale customized production. The service resource allocation is the primary factor that restricts the production time and cost in the cloud manufacturing customized production (CMCP). In order to improve the efficiency and reduce the cost in CMCP, we propose a new framework that considers the collaboration among services with the same functionality. A mathematical evaluation formulation for the service composition and service usage scheme is constructed with the following critical indexes: completion time, cost, and number of selected services. Subsequently, a problem decomposition-based genetic algorithm is designed to obtain the optimal service compositions with service usage schemes. A smart clothing customization case is illustrated so as to show the effectiveness and efficiency of the method proposed in this paper. Finally, the results of simulation experiments and comparisons show that these solutions obtained by our method are with the minimum time, a lower cost, and the fewer selected services. © The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature 2025.

关键词： Cloud manufacturing Personalized customization Problem decomposition Resource allocation Service composition

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Assessment and sequencing of air target threat based on intuitionistic fuzzy entropy and dynamic VIKOR

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Journal of Systems Engineering and electronics 2018年第2期29卷 305-310页

作者： ZHANG Kun KONG Weiren LIU Peipei SHI Jiao LEI Yu ZOU Jie School of Electronics and Information Northwestern Polytechnical UniversityXi’an 710072China Science and Technology on Electro-Optic Control Laboratory Luoyang 471009China

In view of the fact that traditional air target threat assessment methods are difficult to reflect the combat characteristics of uncertain, dynamic and hybrid formation, an algorithm is proposed to solve the multi-target threat assessment problems. The target attribute weight is calculated by the intuitionistic fuzzy entropy(IFE) algorithm and the time series weight is gained by the Poisson distribution method based on multi-times data. Finally,assessment and sequencing of the air multi-target threat model based on IFE and dynamic Vlse Kriterijumska Optimizacija I Kompromisno Resenje(VIKOR) is established with an example which indicates that the method is reasonable and effective.

关键词： threat assessment intuitionistic fuzzy entropy(IFE) dynamic Vlse Kriterijumska Optimizacija I Kompromisno Resenje(VIKOR) poisson distribution time series weight

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Task Assignment and Route Planning Method of Cooperative Attack for Manned/Unmanned Aerial Vehicles

Task Assignment and Route Planning Method of Cooperative Att...

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2017 IEEE International Conference on Unmanned Systems (ICUS)

作者： Kun-Hu KOU Jin-Yong YU Gang WANG Feng-Xia ZHANG the Naval Aeronautical and Astronautically University Science and Technology on Electro-optic Control Laboratory

ISBN: (纸本)9781538631089;9781538631072

This paper proposed a task assignment and route planning method of cooperative attack for manned/unmanned aerial ***,mathematical model of cooperative task assignment and route planning are ***,Multi-task management method based on discrete particle swarm optimization is proposed,and route planning method based on Dubins is ***,task assignment and route planning models are built and simulation study verifies the effectiveness of the proposed method.

关键词： Manned/unmanned aerial vehicles Cooperative attack Task assignment Route planning

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