Results 211 to 220 of about 186,008 (265)

Species‐Dependent and Azimuthally‐Directional Flux Changes of Dispersionless Ion Injections Inside Geosynchronous Orbit

Journal of Geophysical Research: Space Physics, Volume 130, Issue 6, June 2025.
Abstract Dispersionless injection, involving sudden, simultaneous flux enhancements of energetic particles over a broad range of energy, is a characteristic signature of the particles that are experiencing a significant acceleration and/or rapid inward transport process.
T. Motoba, S. Ohtani
wiley   +1 more source

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Adaptive Neural Network Control of a Flexible Spacecraft Subject to Input Nonlinearity and Asymmetric Output Constraint

IEEE Transactions on Neural Networks and Learning Systems, 2021
This article focuses on the vibration reducing and angle tracking problems of a flexible unmanned spacecraft system subject to input nonlinearity, asymmetric output constraint, and system parameter uncertainties.
Yu Liu, Xiongbin Chen, Yilin Wu, He Cai, H. Yokoi   +4 more
semanticscholar   +1 more source

Model-Free Prescribed Performance Control for Spacecraft Attitude Tracking

IEEE Transactions on Control Systems Technology, 2021
The problem of flexible spacecraft attitude tracking control with guaranteeing the prescribed performance is investigated. First, the Lagrangian model of the flexible spacecraft is derived. Then, a model-free control law is proposed, in which information
Yabo Hu, Y. Geng, Baolin Wu, Danwei W. Wang   +3 more
semanticscholar   +1 more source

Command Filtered Backstepping-Based Attitude Containment Control for Spacecraft Formation

IEEE Transactions on Systems, Man, and Cybernetics: Systems, 2021
In this paper, the problem of adaptive finite-time attitude containment control for multiple spacecrafts with unknown external disturbances in spacecraft formation flying is investigated.
Lin Zhao, Jinpeng Yu, P. Shi
semanticscholar   +1 more source

Deep Reinforcement Learning for Spacecraft Proximity Operations Guidance

Journal of Spacecraft and Rockets, 2021
This paper introduces a guidance strategy for spacecraft proximity operations, which leverages deep reinforcement learning, a branch of artificial intelligence.
K. Hovell, S. Ulrich
semanticscholar   +1 more source

Deep Learning Techniques for Autonomous Spacecraft Guidance During Proximity Operations

Journal of Spacecraft and Rockets, 2021
This paper investigates the use of deep learning techniques for real-time optimal spacecraft guidance during terminal rendezvous maneuvers, in presence of both operational constraints and stochasti...
Lorenzo Federici, Boris Benedikter, A. Zavoli   +2 more
semanticscholar   +1 more source

Faster Fixed-Time Control of Flexible Spacecraft Attitude Stabilization

IEEE Transactions on Industrial Informatics, 2020
The rapid attitude stabilization problem of flexible spacecraft with uncertain inertia and disturbances is investigated. In this article, a sliding mode-based fixed-time control approach is presented with a new fixed-time surface ensuring a faster ...
Lu Cao, B. Xiao, M. Golestani, Dechao Ran   +3 more
semanticscholar   +1 more source

Neural Network-Based Pose Estimation for Noncooperative Spacecraft Rendezvous

IEEE Transactions on Aerospace and Electronic Systems, 2020
This article presents the Spacecraft Pose Network (SPN), the first neural network-based method for on-board estimation of the pose, i.e., the relative position and attitude, of a known noncooperative spacecraft using monocular vision.
Sumant Sharma, S. D’Amico
semanticscholar   +1 more source

Modeling and Observer-Based Vibration Control of a Flexible Spacecraft With External Disturbances

IEEE transactions on industrial electronics (1982. Print), 2019
This paper outlines the vibration reduction of a spacecraft with flexible appendage subject to external disturbances. The hybrid dynamic model of the spacecraft is described by both partial differential equations and ordinary differential equations.
Y. Liu, Yun Fu, Wei He, Qing Hui
semanticscholar   +1 more source

Fixed-Time Attitude Tracking Control for Rigid Spacecraft Without Angular Velocity Measurements

IEEE transactions on industrial electronics (1982. Print), 2020
This article considers the problem of velocity-free fixed-time attitude tracking control for rigid spacecraft. With the help of the homogeneity theorem, a semiglobal observer is introduced to estimate the unmeasured angular velocities within fixed time ...
An‐Min Zou, Zhun Fan
semanticscholar   +1 more source