Results 161 to 170 of about 107,269 (181)

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

Low Earth Orbit Satellite Radio Networks

1997
A global phone company may sound a curious statement in an industry still dominated by state-owned monopolies which mainly work within their national borders. But it is a concept whose time has come as, practically everywhere, governments either privatize or think of privatizing and deregulating their phone markets.
openaire   +1 more source

Exploring Positioning Through Pseudoranges Using Low Earth Orbit Satellites

2022
Abstract: For decades, Global Navigation Satellite Systems (GNSS) have been dominant in the Positioning, Navigation and Timing (PNT) market. Improvements have been made to the design and implementation throughout the years. Recently, however, growing demand has emerged for alternative PNT solutions.
Van Uytsel, Wout, Janssen, Thomas, Halili, Rreze, Weyn, Maarten   +3 more
openaire   +2 more sources

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 ...
openaire   +1 more source

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.
openaire   +2 more sources

Yaliny's protocol for low earth orbit satellites

2015 IEEE East-West Design & Test Symposium (EWDTS), 2015
This 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

Precise Autonomous Orbit Maintenance of a Low Earth Orbit Satellite

Journal of Aerospace Engineering, 2018
AbstractIn this paper, the problem of precise autonomous orbit maintenance of a satellite using output feedback and quadratic optimal regulators in a low Earth orbit is investigated.
Hossein Bolandi, Saeed Abrehdari
openaire   +1 more source

COMMUNICATIONS DURATION WITH LOW EARTH ORBITING SATELLITES

2007
Communication via satellite begins when the satellite is positioned in the desired orbital position. The satellite’ s coverage area on the Earth depends on orbital parameters. Ground stations can communicate with LEO (Low Earth Orbiting) satellites only when the satellite is in their visibility region.
Cakaj, Shkelzen, Keim, Werner, Malarić, Krešimir   +2 more
openaire   +2 more sources

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

Low earth orbit satellite based communication systems — Research opportunities

European Journal of Operational Research, 1997
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +2 more sources