Method and system for transmitting radio signals between a fixed terrestrial station and user mobile terminals via a network of satellites
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United States of America Patent
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Jun 9, 1998
Issued Date -
N/A
app pub date -
Jul 8, 1996
filing date -
Jan 2, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention concerns a method and a system for transmitting radio signals between a fixed terrestrial station and mobile user terminals via a network of satellites in inclined circular orbits having a radius less than that of geostationary orbits. The beams generated are divided into pencil beams each associated with a continuous sub-band of frequencies in increasing frequency or decreasing frequency order. The instantaneous transmission frequency is offset progressively during the call towards the frequency subband of the adjacent pencil beam, at a rate proportional to the orbital rotation speed, to enable switching between pencil beams or between satellites. Applications include transmission via satellites in non-geostationary orbit.
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