The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 30, 2003
Filed:
Sep. 17, 2002
Paul W. McBurney, San Francisco, CA (US);
Akira Kimura, San Francisco, CA (US);
Other;
Abstract
An SPS receiver comprises a radio receiver for measuring pseudoranges to orbiting SPS satellites, a local real time clock accurate within three seconds of true SPS system time, and a communication channel to receive NAV-data rebroadcasts from a server. Such server is associated with its own private navigation receiver that has direct satellite signal reception that is strong enough to reliably demodulate the SPS system NAV-data. The SPS receiver synthesizes its own NAV-data from time information provided by the local real time clock and almanac and ephemeris data provided by the server in the rebroadcast. Thus the SPS receiver can operate in weak signal environments that would otherwise be impossible.