Results 51 to 60 of about 11,650 (287)
Mirror formation control in the vicinity of an asteroid [PDF]
, 2008 Two strategies are presented for the positioning and control of a spacecraft formation designed to focus sunlight onto a point on the surface of asteroid, thereby sublimating the material and ejecting debris creating thrust.
Battin R. H. +11 more
core +2 more sources
Preliminary Test of Adaptive Neuro-Fuzzy Inference System Controller for Spacecraft Attitude Control [PDF]
Journal of Astronomy and Space Sciences, 2012 The problem of spacecraft attitude control is solved using an adaptive neuro-fuzzy inference system (ANFIS). An ANFIS produces a control signal for one of the three axes of a spacecraft’s body frame, so in total three ANFISs are constructed for 3-axis ...
Sung-Woo Kim +2 more
doaj +1 more source
Computation of Eclipse Time for Low-Earth Orbiting Small Satellites
International Journal of Aviation, Aeronautics, and Aerospace, 2019 This paper addresses a method for computing eclipse and daylight time for satellites in LEO. Continuous health-monitoring of the satellite is required for the success the mission.
Sumanth R M
doaj +1 more source
Application of Analytic Solution in Relative Motion to Spacecraft Formation Flying in Elliptic Orbit [PDF]
Journal of Astronomy and Space Sciences, 2008 The current paper presents application of a new analytic solution in general relative motion to spacecraft formation flying in an elliptic orbit. The calculus of variations is used to analytically find optimal trajectories and controls for the given ...
Hancheol Cho +2 more
doaj +1 more source
An Earth-Moon Transfer Trajectory Design and Analysis Considering Spacecraft’s Visibility from Daejeon Ground Station at TLI and LOI Maneuvers [PDF]
Journal of Astronomy and Space Sciences, 2010 The optimal Earth-Moon transfer trajectory considering spacecraft’s visibility from the Daejeon ground station visibility at both the trans lunar injection (TLI) and lunar orbit insertion (LOI) maneuvers is designed.
Jin Woo +4 more
doaj +1 more source
Journal of Geophysical Research: Solid Earth, Volume 131, Issue 4, April 2026.Abstract The Ediacaran–Cambrian (∼635–539 Ma) geomagnetic field is characterized by unusually high reversal rates and markedly weakened field strength. Estimates of these reversal frequencies can reveal key aspects of deep Earth dynamics and their potential influence on surface environments and early complex life.
J. W. L. Afonso +12 more
wiley +1 more source
Generating Stable and Metastable Critical Points in Uncertain Systems via Flow‐Based Models
Expert Systems, Volume 43, Issue 3, March 2026.ABSTRACT This work proposes the use of conditional flow‐based generative models to learn an approximation of the distribution of the critical points of a cost function. This approximation is used to incrementally identify all critical points, in the feasible domain of said function, by iteratively alternating the sampling of the distribution and the ...
Callum Wilson, Massimiliano Vasile
wiley +1 more source
Adaptive Saturated Neural Network Tracking Control of Spacecraft: Theory and Experimentation
International Journal of Aerospace Engineering, 2019 An adaptive saturated neural network (NN) controller is developed for 6 degree-of-freedom (6DOF) spacecraft tracking, and its hardware-in-the-loop experimental validation is tested on the ground-based test facility. To overcome the dynamics uncertainties
Kewei Xia, Taeyang Lee, Sang-Young Park
doaj +1 more source
Development of a Hardware-In-Loop (HIL) Simulator for Spacecraft Attitude Control Using Momentum Wheels [PDF]
Journal of Astronomy and Space Sciences, 2008 In this paper, a Hardware-In-the-Loop simulator to simulate attitude control of spacecraft using momentum wheels is developed. The simulator consists of a spherical air bearing system allowing rotation and tilt in all three axes, three momentum wheels ...
Dohee Kim +3 more
doaj +1 more source
Comparison of Current Gravity Estimation and Determination Models [PDF]
, 2018 This paper will discuss the history of gravity estimation and determination models while analyzing methods that are in development. Some fundamental methods for calculating the gravity field include spherical harmonics solutions, local weighted ...
Hillman, Kyle
core +1 more source