Results 211 to 220 of about 6,615 (256)

Aerodynamic drag reduction for satellites in low-earth orbits

AIAA Journal, 1993
Stalker (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

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
openaire   +1 more source

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 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
openaire   +1 more source

Collision matrix for low earth orbit satellites

Journal of Spacecraft and Rockets, 1989
The low Earth orbit (LEO) is becoming cluttered with thousands of satellites, rocket bodies, and a variety of space garbage. This collection of objects crossing paths at speeds on the order of 10 km/s is creating an increasing collision hazard to many operational systems. The effect that the destruction of LEO satellites will have on other users of the
Darren McKnight, Gary Lorenzen
openaire   +1 more source

Low Earth Orbit (LEO) Satellites

SSRN Electronic Journal
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
openaire   +1 more source

Low earth orbit satellite systems for communications

International Journal of Satellite Communications, 1991
AbstractIt may be that we are now entering the era of LEO constellation satellite communications after thirty years of domination by the GEO systems. This paper heralds the coming of the new era with a tutorial approach to the system design and trade‐offs of LEO constellation system design.
Gérard Maral, Jean‐Jacques de Ridder, Barry G. Evans, Madhavendra Richharia   +3 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
openaire   +1 more source

Adaptive signal processing for low Earth orbit satellite communications

ICSP '98. 1998 Fourth International Conference on Signal Processing (Cat. No.98TH8344), 2002
Small link margins, multipath fading and human body effects degrade the performance of low Earth orbit satellite (LEOS) handheld terminals. Adaptive antennas take the rapidly changing environment and human body influence into account to maximise the final signal to interference plus noise ratio (STNR). The proposed reception system for LEOS handsets is
Choy Faith, Cherniakov Mikhail
openaire   +2 more sources

An Overview Of Low Earth Orbit Satellite Routing Algorithms

2023 International Wireless Communications and Mobile Computing (IWCMC), 2023
Chengcheng Li, Yasheng Zhang, Zixuan Cui, Yi Zhang, Jiamin Liu, Zilong Yu, Peiying Zhang   +6 more
openaire   +1 more source