Fuel-Optimal Altitude Maintenance of Low-Earth-Orbit Spacecrafts by Combined Direct/Indirect Optimization [PDF]
Journal of Astronomy and Space Sciences, 2015 This work presents fuel-optimal altitude maintenance of Low-Earth-Orbit (LEO) spacecrafts experiencing non-negligible air drag and J2 perturbation.
Kyung-Ha Kim +2 more
doaj +1 more source
Design of Novel Laser Crosslink Systems Using Nanosatellites in Formation Flying: The VISION
Aerospace, 2022 With growth in data volume from space missions, interest in laser communications has increased, owing to their importance for high-speed data transfer in the commercial and defense fields, spaceborne remote sensing, and surveillance.
Geuk-Nam Kim +10 more
doaj +1 more source
Performance Comparison of the Batch Filter Based on the Unscented Transformation and Other Batch Filters for Satellite Orbit Determination [PDF]
Journal of Astronomy and Space Sciences, 2009 The main purpose of the current research is to introduce the alternative algorithm of the non-recursive batch filter based on the unscented transformation in which the linearization process is unnecessary.
Eunseo Park +2 more
doaj +1 more source
The Earth-Moon Transfer Trajectory Design and Analysis using Intermediate Loop Orbits [PDF]
Journal of Astronomy and Space Sciences, 2009 Various Earth-Moon transfer trajectories are designed and analyzed to prepare the future Korea's Lunar missions. Minimum fuel trajectory solutions are obtained for the departure year of 2017, 2020, 2022, and every required mission phases are analyzed ...
Young-Joo Song +4 more
doaj +1 more source
Unscented KALMAN Filtering for Spacecraft Attitude and Rate Determination Using Magnetometer [PDF]
Journal of Astronomy and Space Sciences, 2009 An Unscented Kalman Filter (UKF) for estimation of the attitude and rate of a spacecraft using only magnetometer vector measurement is developed. The attitude dynamics used in the estimation is the nonlinear Euler`s rotational equation which is augmented
Sung-Woo Kim +3 more
doaj +1 more source
Stellar Source Selections for Image Validation of Earth Observation Satellite [PDF]
Journal of Astronomy and Space Sciences, 2011 A method of stellar source selection for validating the quality of image is investigated for a low Earth orbit optical remote sensing satellite. Image performance of the optical payload needs to be validated after its launch into orbit.
Jiwoong Yu +4 more
doaj +1 more source
Optimal Design of Satellite Constellation Korean Peninsula Regions [PDF]
Journal of Astronomy and Space Sciences, 2008 Designing satellite constellations providing partial coverage of certain regions becomes more important as small low-altitude satellites receives an increasing attention due to its cost-effectiveness analysis.
Nam-Kyun Kim +3 more
doaj +1 more source
Gas-surface interactions modelling influence on satellite aerodynamics and thermosphere mass density
Journal of Space Weather and Space Climate, 2021 The satellite acceleration data from the CHAMP, GRACE, GOCE, and Swarm missions provide detailed information on the thermosphere density over the last two decades.
March Günther +5 more
doaj +1 more source
Bivariate Infinite Series Solution of Kepler’s Equations
Mathematics, 2021 A class of bivariate infinite series solutions of the elliptic and hyperbolic Kepler equations is described, adding to the handful of 1-D series that have been found throughout the centuries.
Daniele Tommasini
doaj +1 more source
Real-Time Orbit Determination for Future Korean Regional Navigation Satellite System [PDF]
Journal of Astronomy and Space Sciences, 2016 This paper presents an algorithm for Real-Time Orbit Determination (RTOD) of navigation satellites for the Korean Regional Navigation Satellite System (KRNSS), when the navigation satellites generate ephemeris by themselves in abnormal situations.
Hyungjik Oh +2 more
doaj +1 more source