Results 211 to 220 of about 4,735 (260)
Some of the next articles are maybe not open access.
Image Metrics for Deconvolution of Satellites in Low Earth Orbit
2020 35th International Conference on Image and Vision Computing New Zealand (IVCNZ), 2020Satellites and space debris clutter low Earth orbital paths, causing concern for future launches as the clutter increases the probability of in-orbit collisions. Therefore, it is important to track and characterise these objects. However, Earth’s atmosphere distorts images collected from ground-based telescopes, which can be reduced through post ...
Sierra Hickman +3 more
openaire +1 more source
Yaliny's protocol for low earth orbit satellites
2015 IEEE East-West Design & Test Symposium (EWDTS), 2015This paper presents a modification of CCSDS 131.2-R-2/DVB-S2 standard developed by Yaliny Engineering. The modification has special features — Doppler offset compensation with prior information, low latency synchronization scheme, which allows for its use on LEO satellites and patent-free LDPC codec.
openaire +1 more source
GEO data relay for low earth orbit satellites
2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC), 2012This paper focuses on a novel, conceptual data relay system for relaying data transfer between low earth orbit (LEO) satellites and a gateway through a geostationary earth orbit (GEO) satellite, developed in the framework of the GeReLEO project. Novel channel adaptive transmission schemes are introduced in addition to the access scheme supporting ...
openaire +1 more source
Eclipse Prediction Algorithms for Low-Earth-Orbiting Satellites
IEEE Transactions on Aerospace and Electronic Systems, 2017Earth-orbiting satellites experience a partial or full eclipse when they pass through the night side of the Earth. These eclipse events can have significant impacts on the satellite due to the dramatic change of the solar radiation incident. It is therefore essential to propose a high-precision eclipse prediction algorithm or even a space-borne ...
Xianghua Jia +3 more
openaire +1 more source
Performance study of low Earth-orbit satellite systems
IEEE Transactions on Communications, 1994The performance of low-earth-orbit satellite systems is investigated in terms of the average number of beam-to-beam handoffs, the average number of satellite-to-satellite handoffs, the channel occupancy distribution, and the average call drop probability.
Ganz, A, GONG, YB, LI, B
openaire +1 more source
The low-eccentricity earth satellite orbit at the critical inclination
Celestial Mechanics, 1978A solution to the orbital motion of an Earth satellite at the critical inclination and with near-zero eccentricity is developed by the von Zeipel method to the first order in the eccentricity, and to the first order in the higher gravitational harmonics, using elements which do not degenerate at zero eccentricity.
Lyddane, R. H., Cohen, Charles J.
openaire +1 more source
Aerodynamic drag reduction for satellites in low-earth orbits
AIAA Journal, 1993Stalker (AIAA Paper 87-0403) has suggested that, by ejecting molecules directly upstream from the entire face of a satellite, it is possible to reduce the drag on a satellite in low-Earth orbit and hence maintain orbit with a total fuel mass (for forward ejection and conventional reaction rockets) less than the typical mass requirements of conventional
G. P. Cathcart, M. N. Macrossan
openaire +3 more sources
GPS single-frequency orbit determination for low Earth orbiting satellites
Advances in Space Research, 2009Abstract The determination of high-precision orbits for Low Earth Orbiting (LEO) satellites (e.g., CHAMP, GRACE, MetOp-A) is based on dual-frequency tracking data from on-board GPS (Global Positioning System) receivers. The two frequencies allow it to eliminate the first order ionosphere effects.
Bock, H. +4 more
openaire +4 more sources
Optimal Dynamic Assignment for Low Earth Orbit Satellite Constellations
Proceedings of the 45th IEEE Conference on Decision and Control, 2005In this paper we investigate the problem of autonomous task assignment for a class of uncertain systems described by dynamic weighted bipartite graphs. Specifically, we consider the optimal assignment problem for this class of system. First, we present necessary and sufficient conditions for the existence of a perfect matching in a given bipartite ...
Alexander Melin +2 more
openaire +1 more source
Aerodynamics of Satellites on a Super Low Earth Orbit
AIP Conference Proceedings, 2008The Super Low Altitude Test Satellite is an engineering test satellite currently under development in Japan Aerospace Exploration Agency in an attempt to open a new frontier of space utilization on extremely low earth orbits. In the presence of aerodynamic forces acting on the satellite, the altitude and attitude of the satellite are maintained by ion ...
Kazuhisa Fujita +2 more
openaire +1 more source