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11th China Conference on Command and control, C2 2023

作者： Yang, Yanjiao Wang, Ziwei Qu, Guangzhou Ma, Meng Liu, ShuaiShuai Chi, QingXi Beijing Electro-Mechanical Engineering Institute Beijing China Science and Technology on Complex System Control and Intelligent Agent Coopration Laboratory Beijing China

ISBN: (纸本)9789819990207

Aiming to obtain the high-precision matching position and reduce time and resource requirements, an image matching method between SAR and optical based on CSP-DenseNet and Gaussian vote by ballot is proposed. First, in order to detect stable interest points and extract deep feature in SAR image, we use FAST operator and CSP-DenseNet. Then, in order to save time and resource requirements, we use gaussian vote by ballot to determine the high-precision matching position between two *** simulation results reveal the validity of the algorithm. © Chinese institute of Command and control 2024.

关键词： Synthetic aperture radar

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Image Matching Method for SAR and Optical Image Based on Siamese Network 1

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3rd International Conference on Autonomous Unmanned systems, ICAUS 2023

作者： Yang, Yanjiao Wang, Ziwei Qu, Guangzhou Ma, Meng Liu, Shuaishuai Chi, Qingxi Beijing Electro-Mechanical Engineering Institute Beijing China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing China

ISBN: (数字)9789819710874

ISBN: (纸本)9789819710867

Aiming at the difficulty of the similarity extraction between the SAR and optical satellite image, an image Matching method for SAR and Optical image based on siamese network is studied. The radar system can provide SAR images while also providing SAR distance and other measurement information. Optical satellites can obtain real-time optical images and provide corresponding longitude and latitude information. Based on the satellite positioning algorithm, the cumulative error of sins can be corrected by kalman filter using SAR and optical image matching results and SAR measurements. Simulation results show the effectiveness of the algorithm. © beijing HIWING Scientific and Technological Information institute 2024.

关键词： Synthetic aperture radar

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Optimization of wireless optical communication quality using near-perfect Laguerre-Gaussian beam in the propagating field

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Optical and Quantum electronics 2025年第1期57卷 1-16页

作者： Wang, Shuailing Xu, Jingping Yang, Yaping Liu, Qian Cheng, Mingjian School of Physics Science and Engineering Tongji University Shanghai200092 China Beijing Institute of Control and Electronic Technology Beijing100038 China School of Physics Xidian University Xi’an710071 China

We propose the use of a near-perfect Laguerre-Gaussian beam (NPLGB) as the propagating field, which maintains a fixed beam radius not only at the source plane but also throughout the entire propagation process, unaffected by orbital angular momentum (OAM). Furthermore, the beam radius of NPLGB is less influenced by radial index, hence NPLGB exhibits perfect property for both OAM and radial index. To evaluate the transmission performance of NPLGB, we introduced the centroid ring radius (CRR) as a novel evaluation metric and validated its effectiveness. Furthermore, we explore the application of NPLGB in wireless optical communications and assess its performance in atmospheric turbulence. Our results reveal that NPLGB offers significantly improved transmission quality compared to traditional Laguerre-Gaussian beam, with the received signal largely unaffected by OAM modes or radial index. The CRR framework provides a comprehensive explanation for the behavior of NPLGB at the receiving end. In addition, we investigated the effects of turbulence and beam parameters on the received probability of NPLGB, and discussed the influence of the radial index on the total crosstalk probability of NPLGB. The application of NPLGB will significantly advance the objective of utilizing LGB to achieve unrestricted degrees of freedom in wireless optical communications, and offers valuable insights for the development of next-generation vortex beams. © The Author(s), under exclusive licence to Springer science+Business Media, LLC, part of Springer Nature 2025.

关键词： Gaussian beams

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Method of improving pedestrian navigation performance based on chest card

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Journal of systems engineering and electronics 2024年第4期35卷 987-998页

作者： CHENG Hao GAO Shuang CAI Xiaowen WANG Yuxuan WANG Jie School of Instrumentation and Optoelectronic Engineering Beihang UniversityBeijing 100191China School of Automation and Electronic Information Xiangtan UniversityXiangtan 411105China Navigation Guidance and Control Graduate School of the Second Institute of China Aerospace Science and Industry CorporationBeijing 100854China

With the development of positioning technology,loca-tion services are constantly in demand by *** a primary location service pedestrian navigation has two main approaches based on radio and inertial *** pedestrian naviga-tion based on radio is subject to environmental occlusion lead-ing to the degradation of positioning *** pedestrian navigation based on micro-electro-mechanical system inertial measurement unit(MIMU)is less susceptible to environmental interference,but its errors dissipate over *** this paper,a chest card pedestrian navigation improvement method based on complementary correction is proposed in order to suppress the error divergence of inertial navigation *** suppress atti-tude errors,optimal feedback coefficients are established by pedestrian motion *** extend navigation time and improve positioning accuracy,the step length in subsequent movements is compensated by the first step *** experi-mental results show that the positioning accuracy of the pro-posed method is improved by more than 47%and 44%com-pared with the pure inertia-based method combined with step compensation and the traditional complementary filtering com-bined method with step *** proposed method can effectively suppress the error dispersion and improve the positioning accuracy.

关键词： pedestrian navigation micro-electro-mechanical sy-stem(MEMS) inertial navigation complementary filtering

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Temperature control method and verification for spaceborne atomic clock based on phase change technology 2

Temperature control method and verification for spaceborne a...

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2023 2nd International Conference on Mechanical, Aerospace Technology and Materials Application, MATMA 2023

作者： Yang, Changpeng Ren, Hongyan Song, Yunfei Xu, Feng Yang, Huning Beijing Key Laboratory of Space Thermal Control Technology Beijing Institute of Spacecraft System Engineering Beijing100094 China School of Engineering Science University of Science and Technology of China Hefei230027 China

The spaceborne atomic clock, as the time reference for navigation signal generation and system ranging, is the core component of the satellite system payload, and temperature stability is one of the main factors affecting the output frequency stability of the atomic clock. To ensure its continuous and stable operation in orbit, the temperature control system needs to provide a good working temperature environment for it. This article takes the high stability temperature control of the rubidium atomic clock in low-Earth inclined orbit as the research background, and conducts research on temperature control methods and phase change devices based on phase change technology. Simulation analysis and in-orbit telemetry data show that, by utilizing the temperature stability characteristic during the phase change process, the phase change temperature control system effectively suppresses the temperature fluctuations of the rubidium atomic clock caused by drastic changes in the space thermal environment. © Published under licence by IOP Publishing Ltd.

关键词： Atomic clocks

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Fuzzy-Cycle: Visible to Infrared Ship Image Translation Based on CycleGAN 6

Fuzzy-Cycle: Visible to Infrared Ship Image Translation Base...

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6th International Conference on Industrial Artificial Intelligence, IAI 2024

作者： He, Long Yu, Yue Liu, Chang Sun, Yangyang Jiang, Feng Hu, Xiaoning Pan, Chengwei Dong, Xiwang School of Artificial Intelli-gence Beihang University Beijing China Beijing Institute of Control and Electronic Technology Beijing China School of Automation Science and Electrical Engineering Science and Technology on Aircraft Control Laboratory Beihang University School of Artificial Intelligence Institute of Unmanned System Beijing China

ISBN: (纸本)9798350356618

Detecting targets in infrared ship images is crucial for various applications, such as maritime rescue and ship inspection. Training contemporary mainstream detection and segmentation models, however, requires large-scale, high-quality infrared ship image datasets. In open-world maritime confrontation scenarios, the complex and variable environment, scarcity of target ships, and limited acquisition conditions make it challenging to construct high-quality infrared ship image datasets. To address this issue, this paper proposes an unpaired visible-infrared ship image translation model based on CycleGAN, named Fuzzy-Cycle. The model introduces a fuzzy cycle loss to encourage the model to learn feature mapping rules between different domains while minimizing attention to unnecessary features. Additionally, the method employs U-Net as the generator network to retain shallow image features during upsampling and selects PatchGAN as the discriminator network, embedding Haar wavelet transform to enhance the discriminator's ability to analyze image frequency domain features. Experiments on the VAIS dataset demonstrate that the proposed algorithm outperforms mainstream unpaired image transfer models, showing excellent performance in the task of visible-infrared ship image translation. Furthermore, zero-shot image translation experiments on the HRSC2016 dataset prove the generalizability and reliability of the proposed method. © 2024 IEEE.

关键词： Wavelet transforms

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Development of a high-resolution near-surface meteorological forcing dataset for the Third Pole region

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science China Earth sciences 2025年第4期68卷 1274-1290页

作者： Yaozhi JIANG Wenjun TANG Kun YANG Jie HE Changkun SHAO Xu ZHOU Hui LU Yingying CHEN Xin LI Jiancheng SHI School of Resources and Environment University of Electronic Science and Technology of ChinaChengdu611731China Department of Earth System Science Ministry of Education Key Laboratory for Earth System ModelingInstitute for Global Change StudiesTsinghua UniversityBeijing100084China National Tibetan Plateau Data Center State Key Laboratory of Tibetan Plateau Earth SystemEnvironment and ResourcesInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing100101China State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing100084China Tsinghua University(Department of Earth System Science)-Xi’an Institute of Surveying and Mapping Joint Research Center for Next-Generation Smart Mapping Beijing100084China National Space Science Center Chinese Academy of SciencesBeijing100190China

Recently,the Third Pole(TP)region has experienced rapid environmental *** data are essential for hydrometeorological and ecological applications but still have large uncertainties on the TP owing to the heterogeneous land surface,complex terrain,and sparse weather *** this study,a long-term(1979–2020)high-resolution(1/30°)meteorological forcing dataset for the TP(TPMFD)was developed,as a sister to the widely used China Meteorological Forcing Dataset(CMFD).The TPMFD comprises seven components necessary for driving land surface *** have previously contributed precipitation and downward shortwave radiation data for the TPMFD,and this study presents the development of five other components and focuses on validations for all ***,2-meter air temperature,2-meter specific humidity,10-meter wind speed,and surface air pressure were generated by combining the fifth-generation atmospheric reanalysis for European Center for Medium-Range Weather Forecasts(ERA5),a short-term high-resolution atmospheric simulation,and in situ observations,and the downward longwave radiation was calculated using semi-physical *** cross-validation and independent-validation demonstrated that most variables in the developed dataset outperformed those in widely used reanalysis datasets,including ERA5,ERA5-Land,and the Global Land Data Assimilation system(GLDAS).This dataset is expected to be beneficial for climate analyses and modeling applications of land-surface processes on the TP.

关键词： Meteorological data Third Pole High-resolution Data downscaling and merging

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Torque effect on vibration behavior of high-speed train gearbox under internal and external excitations

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Railway engineering science 2024年第2期32卷 229-243页

作者： Yue Zhou Xi Wang Hongbo Que Rubing Guo Xinhai Lin Siqin Jin Chengpan Wu Yu Hou School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China CRRC Qishuyan Institute Co. Ltd.No.258Wuyi RoadQishuyanChangzhou 213011China Frontiers Science Center for Smart High-Speed Railway System Beijing Jiaotong UniversityBeijing 100044China

The high-speed train transmission system,experiencing both the internal excitation originating from gear meshing and the external excitation originating from the wheel-rail interaction,exhibits complex dynamic behavior in the actual service *** paper focuses on the gearbox in the high-speed train to carry out the bench test,in which various operat-ing conditions(torques and rotation speeds)were set up and the excitation condition covering both internal and external was *** responses on multiple positions of the gearbox were acquired in the test and the vibration behavior of the gearbox was ***,a stochastic excitation modal test was also carried out on the test bench under different torques,and the modal parameter of the gearbox was ***,the sweep frequency response of the gearbox under gear meshing excitation was analyzed through dynamic *** results showed that the torque has an attenuating effect on the amplitude of gear meshing frequency on the gearbox,and the effect of external excitation on the gearbox vibration cannot be ignored,especially under the rated operating *** was also found that the torque affects the modal param-eter of the gearbox *** torque has a great effect on both the gear meshing stiffness and the bearing stiffness in the transmission system,which is the inherent reason for the changed modal characteristics observed in the modal test and affects the vibration behavior of the gearbox consequently.

关键词： High-speed train Gearbox Bench test Vibration behavior Modal identification

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Analysis of Energy Efficiency Characteristics of Gravity Energy Storage system

Analysis of Energy Efficiency Characteristics of Gravity Ene...

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2024 IEEE International Conference on Electrical Energy Conversion systems and control, IEECSC 2024

作者： Wang, Yuxuan Wang, Yilong Gao, Tian Dong, Linlin Zhang, Liancheng Ma, Xudong Wang, Zufan Zhao, Haisen School of Electromechanical Engineering Beijing Information Science and Technology University Beijing China School of Electrical and Electronic Engineering North China Electric Power University Beijing China School of Electronic and Control Engineering North China Institute of Aerospace Engineering Langfang China

ISBN: (纸本)9798350389357

Gravity energy storage (GES) has the advantages of high environmental adaptability, long life, high environmental protection, which have attracted the attention of more and more scholars in recent years. Efficiency is one of the key technical indicators for the large-scale promotion of energy storage. Since GES is in its infancy and the system structure is complex, the detailed and engineering practical analysis of the efficiency of GES is still in a blank stage. In response to the above problems, this paper proposes a method for establishing an efficiency simulation model. This model is based on the mechanical and electrical combination of the heavy block driving torque within the typical structure of GES. Through simulation analysis, the efficiency characteristics and the law of the loss ratio of the system are revealed: GES typical structure is rated at about 76%, of which the mechanical link loss accounts for the largest proportion of about 61 %, and the loss has a linear characteristic, while the single equipment motor loss is the largest, about 39%, and the loss of a single equipment is sorted from large to small as: motor, gearbox, chain, heavy block, drum and coupling. © 2024 IEEE.

关键词： Storage efficiency

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RESEARCH ON SYNCHRONOUS OPTIMIZATION AND ANTI-SKID STRATEGY OF AIRCRAFT ANTISKID BRAKING system

RESEARCH ON SYNCHRONOUS OPTIMIZATION AND ANTI-SKID STRATEGY ...

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2024 CSAA/IET International Conference on Aircraft Utility systems, AUS 2024

作者： Sun, Xuefeng Liu, Xiaochao Shang, Yaoxing Bai, Ning Dang, Hao Wang, Zhuangzhuang Beihang University School ofAutomation Science and Electrical Engineering Beijing100191 China Beijing Institute of Control and Electronic Technology Beijing100038 China

In this paper, an aircraft synchronous optimization and synchronous anti-skid control strategy is proposed to reduce the yaw burden during aircraft braking. This study analyses the effect of yaw that may be caused by the friction coefficient of an aircraft during braking. A braking synchronous optimization algorithm is developed that can reduce the skidding phenomenon during the increase pressure process. At the same time, a synchronous anti-skid technology is introduced, which automatically adjusts the braking force by detecting the slip state of the wheels on both sides to reduce the risk of aircraft yawing due to unilateral slip. Through a series of simulations and experiments, it is concluded that the use of synchronous optimization and synchronous anti-skid control strategy can significantly reduce the risk of aircraft running off the runway. © The Institution of engineering & Technology 2024.

关键词： Aircraft control

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