Results 31 to 40 of about 2,974 (210)
Improved GPS-based Satellite Relative Navigation Using Femtosecond Laser Relative Distance Measurements [PDF]
Journal of Astronomy and Space Sciences, 2016 This study developed an approach for improving Carrier-phase Differential Global Positioning System (CDGPS) based realtime satellite relative navigation by applying laser baseline measurement data.
Hyungjik Oh +4 more
doaj +1 more source
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
Geophysical Research Letters, Volume 53, Issue 9, 16 May 2026.Abstract A widely accepted global model of glacial isostatic adjustment (GIA) is based on ICE‐6G ice loading and 1D‐viscosity model VM5a, a viscosity profile which remains at odds with mantle convection constraints such as from geoid modeling. We explore 3D‐viscosity variations in models of GIA and show that a model with lateral viscosity variations ...
A. Bellas‐Manley +3 more
wiley +1 more source
Celestial mechanics and astrodynamics: theory and practice
, 2016 This volume is designed as an introductory text and reference book for graduate students, researchers and practitioners in the fields of astronomy, astrodynamics, satellite systems, space sciences and astrophysics. The purpose of the book is to emphasize
Gurfil, Pini, Seidelmann, P Kenneth
core +1 more source
Evolutionary Approach to Lambert’s Problem for Non-Keplerian Spacecraft Trajectories
Aerospace, 2017 In this paper, we use differential evolution (DE), with best-evolved results refined using a Nelder–Mead optimization, to solve boundary-value complex problems in orbital mechanics relevant to low Earth orbits (LEO).
David W. Hinckley, Darren L. Hitt
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
, 2022 The Tudat software was created at the Astrodynamics & Space Missions Section (AS) at TU Delft, as a generic C++ tool for astrodynamics research and education. Since 2020, a Python interface named Tudatpy, has been developed.
Miguel Avillez +13 more
core +1 more source
Mathematics, 2020 Obtaining the inverse of a nonlinear monotonic function f(x) over a given interval is a common problem in pure and applied mathematics, the most famous example being Kepler’s description of orbital motion in the two-body approximation.
Daniele Tommasini, David N. Olivieri
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