Results 261 to 270 of about 115,982 (303)

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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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
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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
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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
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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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Strategies for handover control in low Earth orbit satellite systems

Proceedings of IEEE Vehicular Technology Conference (VTC), 2002
Currently, many efforts are undertaken to develop and install world-wide communications networks based on low Earth orbit (LEO) or intermediate circular orbit (ICO) satellites. However, many problems are still to be solved. One of these problems, namely the design of strategies for handover between satellites is addressed.
Axel Böttcher, Markus Werner
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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
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Magnetic Attitude Control System for Low-Earth Orbit Satellites

Multibody System Dynamics, 2001
The stabilization of a small spacecraft on the low-Earth orbit is done by a three-axis magnetometer. Both orbital motion parameters and attitude can be estimated by the vector function Lyapunov method. The authors also propose a recursive state estimation algorithm with enhanced convergence.
Lebedev, D., Tkachenko, A.
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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
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Low Earth-orbit satellite attitude stabilization with fractional regulators

International Journal of Systems Science, 2004
Fractional Order Control methods were applied to a three-axis reaction wheels satellite attitude control system. To show the advantages of this method, a comparative study between a Linear Quadratic Regulator and a Fractional Order Control was established through two principal fractional control laws.
A. Kailil, N. Mrani, M. Mliha Touati, S. Choukri, N. Elalami   +4 more
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