Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2007-08-21
2007-08-21
Urban, Edward F. (Department: 2618)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S427000, C455S012100, C455S067110
Reexamination Certificate
active
11297557
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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Anderson Jon J.
Dai Jin
Ngai Francis M.
Victor Edward B.
Lee John J.
Patel Ashish
Rouse Thomas
Urban Edward F.
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