Results 251 to 260 of about 10,018,306 (276)

GPS single-frequency orbit determination for low Earth orbiting satellites

Advances in Space Research, 2009
Abstract 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., Jäggi, A., Dach, R., Schaer, S., Beutler, G.   +4 more
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Optimal Dynamic Assignment for Low Earth Orbit Satellite Constellations

Proceedings of the 45th IEEE Conference on Decision and Control, 2005
In 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, Richard Scott Erwin, VijaySekhar Chellaboina   +2 more
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Aerodynamics of Satellites on a Super Low Earth Orbit

AIP Conference Proceedings, 2008
The 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, Atsushi Noda, Takashi Abe   +2 more
openaire   +1 more source

Low Earth orbit communications satellite

1992
A current thrust in satellite communication systems considers a low-Earth orbiting constellations of satellites for continuous global coverage. Conceptual design studies have been done at the time of this design project by LORAL Aerospace Corporation under the program name GLOBALSTAR and by Motorola under their IRIDIUM program.
Moroney, D., Lashbrook, D., Mckibben, B., Gardener, N., Rivers, T., Nottingham, G., Golden, B., Barfield, B., Bruening, J., Wood, D.   +9 more
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Low Earth Orbit Satellite's Orbit Propagation and Determination

2014
Abstract : This paper represents orbit propagation and determination of Low Earth Orbit(LEO) satellites, which is immediate orbit satellite positioning. Beiseds, satellite global positioning system (GPS) configured satellite receiver provides position and velocity measures by navigating the filter to get the coordinates of the orbit propagation (OP ...
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Low Earth orbit satellite technology for PCS

MILCOM 92 Conference Record, 2003
The authors examine today's major issues in terrestrial personal communication systems (PCS) and show the emerging technologies necessary for global PCS. It is suggested that, with the development of existing technologies and the spectrum allocations, the Iridium system of low Earth orbit satellites will revolutionize PCS to make telecommunications a ...
P.N. Cloutier, P.A. Swan
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Low Earth Orbit (LEO) Satellites

Low-earth orbit (LEO) satellites are said to be the technology to revolutionize the internet. With more than a third of the world still offline, this satellite constellation can help connect the unconnected and bridge the digital divide that's leaving remote and rural communities behind. Low-earth orbit (LEO) satellites can help connect the unconnected
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Communications By Means Of Low Earth Orbiting Satellites

1996
Abstract Many organizations have proposed satellite-based personal communications providing global coverage for voice and data to hand-held subscriber units with a direct link to a satellite. Such systems will offer the ultimate promise of personal communications of allowing communications to the personat any time and in any place ...
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On Satellite Orbit Decay Compensation in Low Earth Orbits

2018 Space Flight Mechanics Meeting, 2018
Ehsan Taheri, Robert A. Zidek, Ilya Kolmanovsky, Anouck Girard   +3 more
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Ground Station for Low Earth Orbit Satellites

2022
Ground stations are essential for satellite operations as they are used to send commands to satellites, receive the satellite telemetry information and payload data. We constructed a ground station for UHF and VHF band two-way communication with low Earth orbit satellites and prepared for installation an X-band downlink ground station.
openaire   +1 more source