Global positioning system (gps) receiver for recovery and tracking of signals modulated with p-code
CA 2188667 C · Owner: Knight, Jerry Eugene · Inventors: Knight, Jerry Eugene; Stansell, Thomas Atlee, Jr.; Keegan, Richard Gerald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method and apparatus, for improving the speed and accuracy of processing signals, from global positioning system (GPS) receivers (50, 52), by ensuring access to GPS carrier signals that have been, modulated with an encrypted P-code sequence. In one, disclosed embodiment of the invention, GPS L1 and L2, signals are correlated with a locally generated P-code signal, (64, 62) bandpass filtered, to enhance signal-to-noise ratio performance, and then, cross-correlated (66) to obtain a signal with an L1-L2, frequency component that facilitates the resolution of, carrier cycle ambiguity. In another embodiment, received, GPS signals are immediately converted to digital form, (114), then digitally …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed April 24, 1995 and granted December 30, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 24, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 24, 2017.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.