Results 41 to 50 of about 9,881 (218)
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
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
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
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
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
Real-Time Determination of Relative Position Between Satellites Using Laser Ranging [PDF]
Journal of Astronomy and Space Sciences, 2012 We made a study on real-time determination method for relative position using the laser-measured distance data between satellites. We numerically performed the determination of relative position in accordance with extended Kalman filter algorithm using ...
Shinwon Jung +5 more
doaj +1 more source
Analytical, circle-to-circle low-thrust transfer trajectories with plane change [PDF]
, 2013 Orbit averaging techniques are used to develop analytical approximations of circle-to-circle low-thrust trajectory transfers with plane-change about the Sun.
Appourchaux T. +5 more
core +1 more source
IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.Example of cluster identification of attitude configurations to avoid in the attitude space (in terms of angles of roll, pitch and yaw) for a payload composed by a cross antenna array with angle of arrival technology for CubeSats platforms. ABSTRACT Satellite geolocation of radio‐frequency emitters increasingly relies on compact angle‐of‐arrival (AOA ...
Marcello Asciolla +2 more
wiley +1 more source