A5089253082- Space Satellite Systems and Control
- Spacecraft Dynamics and Control
- Inertial Sensor and Navigation
- Distributed Control Multi-Agent Systems
- Adaptive Control of Nonlinear Systems
- Astro and Planetary Science
- Robotics and Sensor-Based Localization
- Target Tracking and Data Fusion in Sensor Networks
- Advanced Research in Science and Engineering
- Satellite Communication Systems
- Optical Systems and Laser Technology
- Neural Networks Stability and Synchronization
- Advanced Image and Video Retrieval Techniques
- Robotic Path Planning Algorithms
- Control and Dynamics of Mobile Robots
- Spacecraft Design and Technology
- Semiconductor materials and devices
- Advanced Memory and Neural Computing
- Satellite Image Processing and Photogrammetry
- Silicon Carbide Semiconductor Technologies
- Opportunistic and Delay-Tolerant Networks
- Wireless Communication Networks Research
- Advanced Control Systems Optimization
- Anomaly Detection Techniques and Applications
- Geophysics and Gravity Measurements
Xidian University
2023-2025
Harbin Institute of Technology
2014-2024
Civil Aviation University of China
2024
Shijiazhuang Tiedao University
2024
University of Science and Technology Beijing
2024
Beijing Jiaotong University
2024
Beihang University
2024
China Railway Group (China)
2024
Beijing University of Posts and Telecommunications
2023
Hebei University of Technology
2023
This paper comprehensively reviews the state-of-the-art development in formation control of small satellites. Satellite flying, distributed satellite systems, and fractionated are discussed first. Various architectures methods satellites then introduced, including leader-following method, behavior-based virtual structure cyclic pursuit artificial potential function algebraic graph noncontact force method. Coordinative multiple is also reviewed, covering coordinative formation, attitude...
Hydraulic servomechanism is the typical mechanical/hydraulic double-dynamics coupling system with heavy nonlinearity, parametric uncertainties, and mismatching uncertainties input problems. How to estimate compensate by observer a very important issue. This paper proposes an extended-state-observer (ESO)-based nonlinear adaptive control scheme for motion tracking of hydraulic valve-controlled single-rod actuator system. provides solution disturbances, i.e., mechanical dynamics uncertainties....
Cooperative positioning with multiple low earth orbit (LEO) satellites is promising in providing location-based services and enhancing satellite-terrestrial communication. However, accuracy greatly affected by inter-beam interference topology geometry. To select the best combination of from visible ones suppress interference, this paper explores utilization flexible beam scheduling beamforming multi-beam LEO that can adjust directions toward same earth-fixed cell to send signals...
Satellite communication plays a crucial role in supplementing blind areas and enhancing ubiquitous coverage, to meet the connectivity demands of future 6G Internet Things (IoT). As vital means for integrated space-ground intelligent interconnectivity everything system, Direct-to-Smartphone technology has emerged as global development hotspot got widespread attention. This paper analyzes various technical routes numerous technological challenges technology, innovatively proposes key...
Abstract This article addresses the problem of velocity‐free fixed‐time attitude cooperative control for multiple spacecraft under directed communication graphs and in presence bounded disturbances. A distributed state observer is designed to estimate leader's states a extended‐state presented obtain accurate estimates both unmeasurable angular velocities By use observers, scheme proposed make all simultaneously track time‐varying reference even when available only subset group members....
The distributed prescribed-time orbit containment control for the satellite cluster flight with multiple dynamic leaders is investigated. directed information communication topology between followers taken into account in overall paper. When mass assumed to be constant, a controller is, firstly, presented drive convex hull produced by leaders. Then, parameter uncertainty considered, and sliding mode estimator introduced estimate desired velocity of each follower. Based on estimated state,...
Objective To describe the clinical features, treatment, and prognostic factors affecting recurrence long-term adverse outcomes of myelin oligodendrocyte antibody-associated disease (MOGAD). Methods In this retrospective cohort study, records patients diagnosed with MOGAD at Zhengzhou University First Affiliated Hospital between January 2018 March 2023 were analyzed, associated poor prognosis identified using logistic regression. Results Of 91 patients, 69 (76%) new cases, 39 (43%) female, 47...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Zhao-Pei Liu, Xue-Feng Jiang, Yan Li, Yun-Feng Xiao, Li Wang, Jin-Li Ren, Shi-Jie Zhang, Hong Yang, Qihuang Gong; High-Q asymmetric polymer microcavities directly fabricated by two-photon polymerization. Appl. Phys. Lett. 3 June 2013; 102 (22): 221108. https://doi.org/10.1063/1.4809724 Download citation file:...
Visual sensors are used to measure the relative state of chaser spacecraft target during close range rendezvous phases. This article proposes a two-stage iterative algorithm based on an inverse projection ray approach address position and attitude estimation by using feature points monocular vision. It consists two stages: absolute orientation depth recovery. In first stage, Umeyama's is fit three-dimensional (3D) model set estimate 3D point while in second depths observed estimated....
Under dynamic conditions, motion blur is introduced to star images obtained by a sensor. Motion affects the accuracy of centroid extraction and identification stars, further reducing performance In this paper, image restoration algorithm investigated reduce effect on image. The includes kernel calculation aided MEMS gyroscope, correction based structure strip, reconstruction method scaled gradient projection (SGP). Firstly, trajectory spot deduced, gyroscope. Moreover, initial calculated...
Modern spacecraft often deploy large-scale and lightweight solar arrays consisting of composite-laminated plates because their high reliability, superior mechanical properties, low manufacturing cost. This paper presents the deployment dynamics a flexible array composed undergoing large rotation deformation motions. The subject is constrained rigid–flexible coupling rigid main body plates. are described by natural coordinate formulation absolute nodal formulation, respectively. A...
Control allocation considers the problem of controlling instruction distribution for control systems with multiple and redundant actuators. This paper focuses on direct method, making time requirement algorithm analogous compared modified pseudoinverse redistribution methods, linear programming methods solved by simplex sub-gradient optimization method. To reduce off-line computations constructing attainable moment set actuators, a new approach based null space effectiveness matrix is...
In this work, the energy‐optimal trajectory planning and initial pick point searching problem for palletizing robot with high load capacity speed are studied, in which place of fixed to a desired location each single task. These optimization problems have been transformed ternary functional extremum parameters optimal selection performance index rigid‐flexible coupling dynamics model robot, constraint boundary conditions given. The fourth‐order Runge‐Kutta method, multiple shooting...