Aiding beam identification in a satellite system
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United States of America Patent
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-
Aug 21, 2007
Grant Date -
May 11, 2006
app pub date -
Dec 7, 2005
filing date -
Oct 25, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A system and method for determining timing offset errors in a low earth orbit satellite system based upon Doppler and Doppler rate of change is provided. A user terminal determines first and second timing offsets respectively associated with first and second satellite beams from respective first and second satellites. Next, the user terminal determines the Doppler and Doppler rate of change associated with the first and second satellite beams. A timing offset is estimated from the measured Doppler and Doppler rate of change and is then compared with the user terminal's own determined timing offset. If the comparison does not produce a value within a predetermined threshold, a beam identification error is declared.
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