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Research on Intelligent Collaborative Perception of Space Non-cooperative Targets Based on AOCS Platform 1

7th Chinese Conference on Swarm Intelligence and Cooperative control, CCSICC 2023

作者： Du, Hang Hu, Haixia Zhang, Haibo Beijing Institute of Control Engineering Beijing China National Key Laboratory of Science and Technology On Space Intelligent Control Beijing China

ISBN: (数字)9789819733323

ISBN: (纸本)9789819733316

This article provides a detailed introduction to the space non-cooperative targets intelligent collaborative perception module, whose main function is to improve the system’s understanding of the target and task environment through recognition, judgment, learning, and other processes, based on the target model containing multidimensional information obtained from target reconstruction, as well as data resources such as target model characteristic test data and target feature digital volume library. Module includes a space target feature dataset, a space target intelligent cooperative perception algorithm interaction environment, space target model feature clustering and recognition software, space target model matching and situation association software, space target position and attitude measurement software, and a parallel computing module. The dataset is used to train the space target model feature clustering and recognition software to obtain the model parameters of the recognition algorithm, which is used for the recognition of space target identity information and local feature information;the space target model matching and situation association software further associates the recognition information of the local features of the space target. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Association reactions

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Structural non-reciprocity study of optical systems for RFOGs driven by broad-spectrum light sources

Structural non-reciprocity study of optical systems for RFOG...

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2024 International Conference on Optoelectronic Information and Optical Engineering, OIOE 2024

作者： Su, Zhengcheng Yan, Bo Li, Jun Lan, Shiqi National Key Laboratory of Science and Technology on Aircraft Control Flight Automatic Control Research Institute Shaanxi Xi’an710076 China

ISBN: (数字)9781510680470

ISBN: (纸本)9781510680463

Aiming at the structural asymmetry problem caused by the inconsistency of the two optical fibers connecting the Y waveguide and the resonant cavity in the RFOG optical system driven by a broad-spectrum light source, a study on the non-reciprocity of the optical structure of the RFOG driven by a broad-spectrum light source was carried out. A model of the optical system structure non-reciprocity is established, and the effect of the optical system structure non-reciprocity on the gyroscope system in a variable temperature environment is analyzed. The results show that the optical system structure non-reciprocity causes the gyro sweep mode curve to change, but does not affect the system accuracy when there is no temperature change, and the temperature characteristics of the optical system structure non-reciprocity lead to pseudo-rotational speed output of the gyro output in a variable temperature environment, which is strongly correlated with the length difference and the rate of change of temperature. © 2024 SPIE.

关键词： Light sources

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Real-time monitoring and analysis of hydraulic fracturing in surface well using microseismic technology:Case insights and methodological advances

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International Journal of Mining science and technology 2025年第4期35卷 619-638页

作者： Yanan Qian Ting Liu Cheng Zhai Hongda Wen Yuebing Zhang Menghao Zheng Hexiang Xu Dongyong Xing Xinke Gan State Key Laboratory of Coal Mine Disaster Prevention and Control China University of Mining and TechnologyXuzhou 221116China Yunlong Lake Laboratory of Deep Underground Science and Engineering Xuzhou 221003China Key Laboratory of Theory and Technology on Coal and Rock Dynamic Disaster Prevention and Control National Mine Safety AdministrationChina University of Mining and TechnologyXuzhou 221116China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China School of Emergency Management Chengdu UniversityChengdu 610106China School of Safety Science and Engineering Anhui University of Science and TechnologyHuainan 232001China Xinjiang Yaxin Coalbed Methane 156 Exploration Co. Ltd.Urumqi 841100China

Through a case analysis,this study examines the spatiotemporal evolution of microseismic(MS)events,energy characteristics,volumetric features,and fracture network development in surface well hydraulic fracturing.A total of 349 MS events were analyzed across different fracturing sections,revealing significant heterogeneity in fracture *** scanning results showed that cumulative energy values ranged from 240 to 1060 J across the sections,indicating notable *** reservoir volume(SRV)analysis demonstrated well-developed fracture networks in certain sections,with a total SRV exceeding 1540000 m^(3).The hydraulic fracture network analysis revealed that during the midfracturing stage,the density and spatial extent of MS events significantly increased,indicating rapid fracture propagation and the formation of complex *** the later stage,the number of secondary fractures near fracture edges decreased,and the fracture network *** comparing the branching index,fracture length,width,height,and SRV values across different fracturing sections,Sections No.1 and No.8 showed the best performance,with high MS event densities,extensive fracture networks,and significant energy ***,Sections No.4 and No.5 exhibited sparse MS activity and poor fracture connectivity,indicating suboptimal stimulation effectiveness.

关键词： Hydraulic fracturing Microseismic Source location Energy scanning Fracture network

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Angle-Multiplexed Terahertz Frequency-Selective Fingerprint Sensor: Broadband Identification of Chiral Enantiomers 38

Angle-Multiplexed Terahertz Frequency-Selective Fingerprint ...

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38th IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2025

作者： Sun, Hongshun Cao, Yunhao Chen, Yusa Li, Liye Ma, Lijun Jin, Shengxiao Gu, Guodong Feng, Zhihong Wu, Wengang Peking University National Key Laboratory of Advanced Micro and Nano Manufacture Technology School of Integrated Circuits Beijing China National Key Laboratory of Science and Technology on Space Microwave Cast Xi'an China National Key Laboratory of Solid-State Microwave Devices and Circuits Shijiazhuang China

ISBN: (纸本)9798331508890

Chiral enantiomers exhibit distinct pharmacological and pharmacokinetic properties, which must be strictly detected to avoid any adverse effects on the human body. Conventional terahertz (THz) detection methods present a significant challenge in trace amount analysis and broadband detection of analytes. Guided-mode resonance (GMR) metasurfaces are employed to enhance light-matter interaction, and a THz wave-angle scanning method is proposed for the successful identification of chiral glutamic. This method involves adjusting the incidence angle (20°-45°) to enhance broadband signals (0.95-1.45 THz) for molecular fingerprinting. The study provides a method for highly sensitive and versatile miniature THz spectroscopic devices. © 2025 IEEE.

关键词： Terahertz waves

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Fixed-time-synchronized control: a system-dimension-categorized approach

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science China(Information sciences) 2023年第7期66卷 177-194页

作者： Wanyue JIANG Shuzhi Sam GE Dongyu LI Institute for Future & Shandong Key Laboratory of Industrial Control Technology School of Automation Qingdao University Department of Electrical and Computer Engineering National University of Singapore School of Cyber Science and Technology Beihang University Shanghai Institute of Satellite Engineering

This study addresses the fixed-time-synchronized control problem of perturbed multi-input multioutput(MIMO) systems. In the task of fixed-time-synchronized control, different dimensions of the output signal in MIMO systems are required to reach the desired value simultaneously within a fixed time *** MIMO system is categorized into two cases: the input-dimension-dominant and the state-dimensiondominant cases. The classification is defined according to the dimension of system signals and, more importantly, the capability of converging at the same time. For each kind of MIMO system, sufficient Lyapunov conditions for fixed-time-synchronized convergence are explored, and the corresponding robust sliding mode controllers are designed. Moreover, perturbations are compensated using the super-twisting technique. The brake control of the vertical takeoff and landing aircraft is considered to verify the proposed method for the input-dimension-dominant case, which shows the essential advantages of decreasing the energy consumption and the output trajectory length. Furthermore, comparative numerical simulations are performed to show the semi-time-synchronized property for the state-dimension-dominant case.

关键词： fixed-time-synchronized convergence sliding mode control perturbed MIMO systems

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Gut liver brain axis in diseases:the implications for therapeutic interventions

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Signal Transduction and Targeted Therapy 2024年第1期9卷 79-104页

作者： Mengyao Yan Shuli Man Benyue Sun Long Ma Lanping Guo Luqi Huang Wenyuan Gao State Key Laboratory of Food Nutrition and Safety Key Laboratory of Industrial MicrobiologyMinistry of EducationTianjin Key Laboratory of Industry MicrobiologyNational and Local United Engineering Lab of Metabolic Control Fermentation TechnologyChina International Science and Technology Cooperation Base of Food Nutrition/Safety and Medicinal ChemistryCollege of BiotechnologyTianjin University of Science&Technology300457 TianjinChina National Resource Center for Chinese Materia Medica China Academy of Chinese Medical Sciences100700 BeijingChina Tianjin Key Laboratory for Modern Drug Delivery&High-Efficiency School of Pharmaceutical Science and TechnologyTianjin UniversityWeijin Road300072 TianjinChina

Gut-liver-brain axis is a three-way highway of information interaction system among the gastrointestinal tract,liver,and nervous *** the past few decades,breakthrough progress has been made in the gut liver brain axis,mainly through understanding its formation mechanism and increasing treatment *** this review,we discuss various complex networks including barrier permeability,gut hormones,gut microbial metabolites,vagus nerve,neurotransmitters,immunity,brain toxic metabolites,β-amyloid(Aβ)metabolism,and epigenetic regulation in the gut-liver-brain *** therapies containing antibiotics,probiotics,prebiotics,synbiotics,fecal microbiota transplantation(FMT),polyphenols,low FODMAP diet and nanotechnology application regulate the gut liver brain ***,some special treatments targeting gut-liver axis include farnesoid X receptor(FXR)agonists,takeda G protein-coupled receptor 5(TGR5)agonists,glucagon-like peptide-1(GLP-1)receptor antagonists and fibroblast growth factor 19(FGF19)*** gut-brain axis embraces cognitive behavioral therapy(CBT),antidepressants and tryptophan metabolism-related *** liver-brain axis contains epigenetic regulation and Aβmetabolism-related *** the future,a better understanding of gut-liver-brain axis interactions will promote the development of novel preventative strategies and the discovery of precise therapeutic targets in multiple diseases.

关键词： metabolism therapeutic immunity

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A Fast Positioning Method of Navigation Receiver Assisted by Doppler Information 14th

A Fast Positioning Method of Navigation Receiver Assisted by...

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14th China Satellite Navigation Conference, CSNC 2024

作者： Tang, Yinyin Lu, Junyong Feng, Junhong Li, Kai National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan430033 China

ISBN: (纸本)9789819969319

In order to shorten the time to first fix (TTFF) of the satellite receiver, a fast positioning method using both carrier and pseudo code observation is proposed. First, use the Doppler information acquired by the carrier tracking loop to reduce the a priori time accuracy to 100 s. Then, use the code phase acquired by pseudo-code tracking loop, and use the five-state equation to solve the receiver position. In this way, positioning can be achieved before frame synchronization and bit synchronization. Numerical simulation and test results show that positioning can be achieved within 1s through Beidou/GPS dual system in the global or BeiDou alone in the Asia-Pacific region, when the a priori position accuracy is less than 10 km and the a priori time accuracy is less than 2 h. © Aerospace Information Research Institute 2024.

关键词： Equations of state

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Three-dimensional reconstruction method by Fourier spectrum analysis-based white light interference scanning 6

Three-dimensional reconstruction method by Fourier spectrum ...

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6th Conference on Frontiers in Optical Imaging and technology: Imaging Detection and Target Recognition

作者： Chen, Weiwei Chen, Shanyong Xiong, Yupeng Liu, Junfeng College of Intelligence Science and Technology National University of Defense Technology Changsha410073 China Laboratory of Science and Technology on Integrated Logistics Support National University of Defense Technology Changsha410073 China Hunan Key Laboratory of Ultra-Precision Machining Technology Changsha410073 China

ISBN: (数字)9781510679733

ISBN: (纸本)9781510679726

In the three-dimensional(3-D) microscopic measurement based on white light interference imaging, due to the influence of external environment interference and the phase-shifting step size of micro-shifter, the sampling signal by longitudinal scanning may have the problem of "peak leakage", which seriously affects the accuracy of measurement results. In this paper, by analyzing the spectrum of interference signal, a method for extracting zero optical path difference(OPD) position based on multinomial Gaussian fitting for envelope curve of filtered time domain signal is proposed. Finally, based on the method proposed in this paper and ZYGO commercial interferometer, the comparative measurement experiment of standard steps is carried out. The simulation and experimental results show that the method has good robustness and effectiveness. © 2024 SPIE. All rights reserved.

关键词： Spectrum analysis

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Three-Dimensional Cooperative Guidance Against Aerial Target for Unpowered Glide Vehicle

Three-Dimensional Cooperative Guidance Against Aerial Target...

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2024 China Automation Congress, CAC 2024

作者： Li, Bocun Li, Ling Zhang, Huaming Zhu, Yichuan National Key Laboratory of Science and Technology on Aerospace Intelligence Control Beijing Aerospace Automatic Control Institute Beijing China Committee of Science and Technology Beijing Aerospace Automatic Control Institute Beijing China

ISBN: (纸本)9798350368604

This paper investigates the spatial-temporal guidance problem for multiple unpowered High-speed Glid Vehicles (HGV). First, a 3D vector guidance law is given by extending the traditional 2D guidance law to 3D scenario, in which the terminal angle constraint and time-coordination of multiple HGVs are satisfied. Then, the time-to-go estimation problem considering moving target for HGV without active velocity control is addressed by numerical integration, and from which predictive intercepting point (PIP) is gained, thus the problem of intercepting a moving target simultaneously is simplified as guiding multiple HGVs to hit a fixed point along different directions at same time. Taking into account that aerial target can evade threats through terminal maneuvering, an extended state observer is used to estimate the acceleration of target. Accordingly, a sliding mode terminal guidance law designed in the framework of Line-of-Sight (LOS), which is different from the previous guidance law, is used to compensate the disturbance caused by the maneuvering target. Unlike similar existing results, the proposed guidance strategy for HGV can satisfy spatial-temporal constraints when the target is moving or maneuvering, and the guidance law designed in this paper is appropriate for unpowered vehicles without constant velocity. Numerical simulations are provided to show the effectiveness of the proposed cooperative guidance law. © 2024 IEEE.

关键词： State estimation

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EPM-Net: A better way for optical and infrared scene matching via edge point 12

EPM-Net: A better way for optical and infrared scene matchin...

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SPIE 12th International Symposium on Multispectral Image Processing and Pattern Recognition, MIPPR 2023

作者： Huang, Shixiang Chi, Longyun Fu, Wenxing Tian, Jinwen National Key Laboratory of Multispectral Information Intelligent Processing Technology Huazhong University of Science and Technology Wuhan China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing China

ISBN: (数字)9781510674943

ISBN: (纸本)9781510674936

As a crucial auxiliary technique in inertial navigation, scene matching has been widely applied in aircraft navigation and guidance. To enhance the adaptability and efficiency of scene matching algorithms in complex environments, existing approaches have gradually shifted towards heterogeneous scene matching, such as optical/ infrared scene matching based on deep learning features, with a focus on point features. However, due to the complex and diverse nonlinear distortions between optical and infrared images, the matching accuracy often fails to meet the practical requirements of navigation and positioning. In view of this problem, an EPM-Net algorithm based on edge features is proposed to improve matching performance by extracting more stable and discriminative edge point descriptors. Experimental results on infrared datasets demonstrate that this method achieves an average matching accuracy improvement of more than four times compared to traditional and existing deep learning methods. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Deep learning

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