Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-09-14
2010-06-15
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S134000, C375S137000, C375S139000, C375S140000, C375S142000, C375S145000, C375S149000
Reexamination Certificate
active
07738537
ABSTRACT:
A pre-correlation filter determines the timing of a second pseudorandom number (“PRN”) code, using an image of the average chip shape formed for a first PRN code. The filter collects measurements corresponding to samples of a received signal over multiple code chips of the first PRN code at sample times that are asynchronous to code rate. A code phase decoder directs the measurements to accumulation registers that are associated with code chip ranges that are fractions of a code chip of the first PRN code based on the code phase angles of the samples in the first PRN code, to accumulate measurements relating to chip transitions in the first PRN code and measurements relating to chip transitions in the second PRN code. The chip edges of the second PRN code are detected from the image of average chip shape for the first PRN code formed from the accumulated measurements.
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Cesari and McMenna, LLP
Liu Shuwang
NovAtel Inc.
Sheehan Patricia A.
Timory Kabir A
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