Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-02-26
2009-06-30
Fan, Chieh M (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S149000, C375S150000
Reexamination Certificate
active
07555032
ABSTRACT:
A GPS receiver and method using alternating “A” and “B” integration time segments. The polarities of certain GPS data bits are known beforehand and their expected reception times are known. The GPS signal in 10 millisecond “A” time segments and “B” time segments is depolarized according to the known polarities. The depolarized GPS signal during an “A” time period made up of all the “A” time segments is integrated for providing an “A” time period magnitude for each code phase. Likewise, the depolarized GPS signal during a “B” time period made up of all the “B” time segments is integrated for providing a “B” time period magnitude for each potential GPS code phase. The strongest of the time period magnitudes is compared to a correlation threshold for selecting a code phase for signal acquisition.
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Loomis Peter Van Wyck
Yu Yiming
Fan Chieh M
Ghulamali Qutbuddin
Trimble Navigation Limited
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