Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-01-09
2007-01-09
Patel, Jay K. (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S142000, C375S343000
Reexamination Certificate
active
10354213
ABSTRACT:
A GPS receiver having a ratio-based signal acquisition method. The GPS receiver has a tentative signal acquisition when a first ratio of the largest GPS signal correlation value to the second largest in a first time period exceeds a selected qualification ratio. The GPS receiver verifies signal acquisition when the average of iteration ratios for largest to second largest correlation values in iteration time periods exceed the qualification ratio.
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David M. Lin & James B. Y. Tsui, “An Efficient Weak Signal Acquisition Algorithm for a Software GPS Receiver”, Proceedings of Institute of Navigation Global Positioning System (ION GPS) conference, Sep. 11-14, 2001, Salt Lake City, Utah, pp. 115-136.
Dennis M. Akos, Per-Ludvig Normark, Jeong-Taek Lee, Konstantin G. Gromov, James B. Y. Tsui & John Schamus, “Low Power Global Navigation Satellite System (GNSS) Signal Detection and Processing”, Proceedings of Institute of Navigation Global Positioning System (ION GPS) conference, Sep. 19-22, 2000, Salt Lake City, Utah, pp. 784-791.
Gildea David R.
Lugo David B.
Patel Jay K.
Trimble Navigation Limited
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