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The magnetic stripe signatures of the North Atlantic Ocean crust derived from Swarm and Macao science Satellite-1 observations

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Earth and Planetary Physics 2025年第3期9卷 635-641页

作者： PengFei Liu Liang Yin ShiDa Sun HongBo Yao Macao Institute of Space Technology and Application Macao University of Science and TechnologyMacao 999078China Key Laboratory of Intelligent Detection and Equipment for Underground Space of Beijing-Tianjin-Hebei Urban Agglomeration Ministry of Natural ResourcesHebei GEO UniversityShijiazhuang 050031China

The Earth's crust,the outer shell of the Earth,consists of continental crust and oceanic *** crust is created at the mid-oceanic ridge,where it is magnetized in the ambient field of the *** new material is extruded,the crust spreads outward,retaining its *** reversal of the polarity of the Earth's magnetic field over geologic time leads to a pattern of striped magnetic *** this study,we carry out a preliminary evaluation on how data from the Macao science Satellite-1(MSS-1),which has a low orbital inclination,influences inversion models of the oceanic crustal magnetic field when combined with data from the Swarm *** our modeling we use an equivalent source method based on a cubed-sphere *** model captures the broad magnetic structure over the North Atlantic Ocean and demonstrates that the trend of magnetic stripes is consistent with the age frame of the oceanic *** amplitude of the radial magnetic field at 450 km the North Atlantic Ocean ranges from–11 nT to+8 *** addition of MSS-1 observations to Swarm data generates results consistent with the overall magnetic stripe *** lack of short-wavelength scale structure reveals the limitation of high-altitude satellites in portraying fine features and hence lower-altitude observations would be required to delineate a more detailed crustal *** is expected to obtain a finer structure of oceanic magnetic stripes by combining low-altitude CHAMP field data and east-west gradient data derived from MSS-1 in future work.

关键词： ocean magnetic stripes lithospheric magnetic structure Macao science Satellite-1

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In-Band Full-Duplex Communication for OFDM Integrated Sensing and Communication Systems

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IEEE Internet of Things Journal 2025年

作者： Duan, Baiyu Li, Tong Pan, Wensheng Zhou, Hui Shen, Ying Liu, Ying Shao, Shihai University of Electronic Science and Technology of China National Key Laboratory of Wireless Communications Chengdu611731 China Laboratory of Electromagnetic Space Cognition and Intelligent Control Beijing100089 China

In-band full-duplex (IBFD) integrated sensing and communication (ISAC) systems, where the base station (BS) simultaneously conducts the IBFD mode for both communication and sensing functions, increase spectral efficiency and reduce both communication and sensing latency. However, it is challenging to decouple the target echo and uplink communication signal at the digital domain of the receiver within serious self-interference (SI) from the transmitter. This paper investigates a digital canceller for IBFD ISAC systems with orthogonal frequency-division multiplexing (OFDM) waveform, enabling IBFD communication and sensing within the same time-frequency resource. With the proposed frequency-domain two-stage interference cancellation method, the ISAC receiver cancels the static interference and extracts the moving target echo signal for the sensing function. Subsequently, the uplink communication signal is decoupled after mitigating the target echo signal. Both sensing and communication performance are evaluated under different merits. Meanwhile, simulation and experiment results demonstrate the feasibility and effectiveness of the frequency-domain-canceller-enabling IBFD communication-based ISAC system. © 2014 IEEE.

关键词： Orthogonal frequency division multiplexing

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Random Error Analysis of Launch and Injection Positions for Distributed Multi Micro-nano Satellite System 3

Random Error Analysis of Launch and Injection Positions for ...

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2023 3rd International Conference on Computer, Remote Sensing and Aerospace, CRSA 2023

作者： Wu, Huanqin Wang, Maocai Song, Zhiming Chen, Xiaoyu Dai, Guangming Zheng, Wei Zhou, Qingrui School of Computer Science China University of Geosciences Hubei Wuhan430074 China Qian Xuesen Laboratory of Space Technology China Academy of Space Technology Beijing100094 China Intelligent Game and Decision Laboratory Beijing100071 China

Accurate satellite orbit calculation has always been a focus in the aerospace field. Especially, the error distribution of the orbit involving various internal and external factors in the satellite launch process has an important influence on the effectiveness of the satellite cluster. To qualitatively and quantitatively analyze the cooperative efficiency of multi-satellite clusters involving various random errors, this paper analyzes the random error sources in the launch process of micro-nano satellites and studies the distribution law of these satellite orbit position errors. Based on the parameter estimation and the central limit theorem of probability theory, the expression of the error function for the satellite's orbit position is also constructed. In addition, the probability distribution model of the satellites in a certain range is designed, and the relationship between the number of satellites and the overall errors is proposed. Finally, the result is verified by the simulation experiment, which provides the rationale behind the position and altitude adjustment and constellation optimization of micro-nano satellites. © Published under licence by IOP Publishing Ltd.

关键词： Random errors

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Evolution of Constellation Reconstruction for Enhanced Regional Communication Capability

Evolution of Constellation Reconstruction for Enhanced Regio...

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2023 China Automation Congress, CAC 2023

作者： Dong, Sun Yihan, Liu Han, Yan Xiaochao, Liu Pengyuan, Qi School of Automation Science and Electrical Engineering Beihang University Beijing China Beijing Institute of Control Engineering National Key Laboratory of Space Intelligent Control Beijing100094 China Beijing Sun Wise Space Technology Ltd. Beijing100190 China Research Institute for Frontier Science Beihang University Beijing China

ISBN: (纸本)9798350303759

In the era of global personal communication and the rapid progress of small satellite technology, low-orbit constellations have emerged as a focal point for countries worldwide. These constellations, primarily employed for communication purposes, offer advantages such as enhanced signal strength and shorter revisit cycles due to their proximity to the Earth's surface. However, the high deployment cost associated with the large number of satellites in low-orbit constellations poses a significant challenge. As launch costs continue to decline and the number of satellites in constellations increases, there is a growing interest in leveraging these constellations during times of war or sudden disasters in specific regions. This entails designing communication-enhanced constellations tailored to the targeted area and formulating an active configuration evolution plan that facilitates seamless transition from the existing constellation to the desired configuration. The objective of this paper is to propose a scheme for optimizing constellation parameters to enhance communication capabilities within a specific region. Additionally, an active configuration evolution scheme with minimal fuel consumption is introduced to effectively address emergency scenarios. © 2023 IEEE.

关键词： Orbits

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NO_(2) gas sensor with high selectivity and fast response based on Pt-loaded nanoporous GaN

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International Journal of Minerals,Metallurgy and Materials 2025年第4期32卷 964-972页

作者： Dan Han Xiaoru Liu Donghui Li Jiexu Shi Yu Wang Yuxuan Wang Hongtao Wang Shengbo Sang Shanxi Key Laboratory of Micro/Nano Sensors&Artificial Intelligence Perception College of Integrated CircuitsTaiyuan University of TechnologyTaiyuan030024China Key Lab of Advanced Transducers and Intelligent Control System of the Ministry of Education Taiyuan University of TechnologyTaiyuan 030024China Shanxi Research Institute of 6D Artificial Intelligence Biomedical Science Taiyuan 030032China

In this work,we realized a room-temperature nitrogen dioxide(NO_(2))gas sensor based on a platinum(Pt)-loaded nanoporous gallium nitride(NP-GaN)sensing material using the thermal reduction method and coreduction with the catalysis of *** gas sensor gained excellent sensitivity to NO_(2) at a concentration range of 200 ppm to 100 ppb,benefiting from the loading of Pt nanoparticles,and exhibited a short response time(22 s)and recovery time(170 s)to 100 ppm of NO_(2) at room temperature with excellent selectivity to NO_(2) compared with other *** phenomenon was attributed to the spillover effect and the synergic electronic interaction with semiconductor materials of Pt,which not only provided more electrons for the adsorption of NO_(2) molecules but also occupied effective sites,causing poor sites for other *** low detection limit of Pt/NP-GaN was 100 ppb,and the gas sensor still had a fast response 70 d after ***,the gas-sensing mechanism of the gas sensor was further elaborated to determine the reason leading to its improved *** significant spillover impact and oxygen dissociation of Pt provided advantages to its synergic electronic interaction with semiconductor materials,leading to the improvement of the gas properties of gas sensors.

关键词： nanoporous gallium nitride platinum nitrogen dioxide gas sensor

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Distributed finite-time event-triggered formation control based on a unified framework of affine image

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IEEE/CAA Journal of Automatica Sinica 2024年第6期12卷 1-3页

作者： Lin, Yan-Jun Yang, Yun-Shi Chai, Li Lin, Zhi-Yun Hangzhou Applied Acoustics Research Institute Hangzhou 310027 China College of Control Science and Engineering Zhejiang University Hangzhou 310027 China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen 518055 and also with Peng Cheng Laboratory Shenzhen 518000 China

Dear Editor, This letter concentrates on distributed event-triggered formation control problems with finite-time convergence in an arbitrarily dimensional Euclidean space. A new unified approach of finite-time event-triggered formation control is proposed by steering all agents to a sliding manifold (the affine image) to achieve general formations, like affine, rigid or translational formation. It only requires to design an extra steering law driving at least d +1 leaders from an affine image to a rigid or translational image, where d is the dimension of the space. The event-triggered function is designed in a distributed and discontinuous manner based only on local information to reduce the communication and calculation resources by aperiodic sampling. In the proposed event-triggered formation law, zeno-free behavior is ensured. IEEE

关键词： Sliding mode control

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Six-Degree-of-Freedom intelligent control of Hypersonic Flight Vehicle

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IEEE Transactions on Aerospace and Electronic Systems 2025年

作者： An, Hao Wang, Yiming Zhong, Xinyu Ye, Yongfeng Harbin Institute of Technology Space Control and Inertial Technology Research Center National Key Laboratory of Complex System Control and Intelligent Agent Cooperation Harbin China

The six-degree-of-freedom control of hypersonic flight vehicle (HFV) faces great challenges due to complex aerodynamics, inherent couplings and multiple constraints. This paper investigates the six-degree-of-freedom guidance and attitude control problem for unpowered gliding HFV. The guidance loop is based on the predictor-corrector method with three improvements of intelligent prediction acceleration, path constraints accommodation and no-fly zones circumvention. To quickly respond to guidance commands, three attitude channels (i.e., roll, pitch and yaw) are completely decoupled by nonlinear dynamic inverse, based on which a high-performance low-complexity attitude controller is proposed. This benefits from the appropriate integration of barrier function and sliding mode control, while design conditions of three alternative performances (i.e., asymptotic, exponential and preset-time convergences) are discussed. Servo dynamics and physical constraints of aerodynamic control surfaces are also well handled. © 2025 IEEE.

关键词： Hypersonic vehicles

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RP-MSTC∗: Multi-Agent Coverage Path Planning Algorithm Emphasizing Local Area Updates

RP-MSTC∗: Multi-Agent Coverage Path Planning Algorithm Emph...

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2023 International Conference on Neuromorphic Computing, ICNC 2023

作者： Yang, Yong He, Dingxin Mao, Huantao Chen, Hong Wu, Hongtao Liu, Zhi-Wei School of Artificial Intelligence and Automation Huazhong University of Science and Technology Key Laboratory of Image Processing and Intelligent ControlMinistry of Education Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9798350316889

Compared to traditional area coverage algorithms, this paper proposes a re-plannable multi-agent coverage path planning algorithm to address issues such as low coverage rate of multiple agents in large-scale scenarios like warehouses and inability to cope with local environmental changes. Initially, the MSTC∗ algorithm is utilized to create the coverage path based on the available map information. To address scenarios like idle areas for material placement, the method introduces local area detection and path re-planning to enhance the coverage rate. This paper verifies the feasibility and effectiveness of the algorithm under different maps through simulation experiments. Compared with the coverage situation of other coverage path planning algorithms in environments with local area updates, the algorithm proposed in this paper has a higher coverage rate in this scenario. © 2023 IEEE.

关键词： Motion planning

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

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

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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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Energy management of solid oxide fuel cell/lithium battery hybrid system

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CSEE Journal of Power and Energy Systems 2022年 1-14页

作者： Li, Dong Zhong, Xiao Bo Xu, Yuan Wu Wei, Chong Yang Zhao, Song Jiang, Jianhua Deng, Zhonghua Fu, Xiaowei Li, Xi School of Artificial Intelligence and Automation Key Laboratory of Image Processing and Intelligent Control of Education Ministry Huazhong University of Science and Technology Hubei Wuhan430074 China College of Computer Science and Technology Hubei Province Key Laboratory of Intelligent Information Processing and Real-time Industrial System Wuhan University of Science and Technology Hubei Wuhan430081 China

The research of fuel cell and lithium battery hybrid system has attracted more and more researchers because of its advantages of low emission. However, the lower efficiency of energy management has been a critical factor that obstruct the commercialization of hybrid system. In this work, based on finite element ideas, a solid oxide full cell node model is developed to accurately estimate the operating status of the fuel cell. As for lithium battery, previous energy management studies generally only focused on state of charge, however, state of health is also a key parameter for lithium battery. In this paper, considering the strong coupling between variables we use particle filter algorithm to jointly estimate the state of charge and state of health. To reasonably distribute and manage the energy in the hybrid system, a T-S fuzzy controller for the hybrid system is designed by controlling the state variables in the SOFC model and the state of lithium battery. Finally, our algorithm is verified by Dspace simulation platform. The result shows that the hybrid system with the energy management strategy not only meets the real-time sharply changing demand but also ensures the hybrid system working efficiently and safely. © 2022 China Electric Power Research Institute. All rights reserved.

关键词： Hybrid systems

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