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:
Apr. 13, 1993
Filed:
Sep. 10, 1991
Dominic Farmer, Mountain View, CA (US);
Kreg Martin, Cupertino, CA (US);
Trimble Navigation, Sunnyvale, CA (US);
Abstract
Improved apparatus for generation of the P-code sequences used in global positioning by issuance and sensing of code sequences issued by a plurality of satellites. The improved apparatus generates the same P-code sequences with fewer components, or with different components, by removal or replacement of: (1) a time delay/multiplexer module that allows choice of the satellite whose P-code is being formed and issued; (2) four 12-bit counters that determine the end of an epoch and are associated with four X code registers; (3) components that produce precession of an X1 code sequence relative to an X2 code sequence; and (4) an end-of-the-period counter, used to sense occurrence of the end of a chosen period, for example, 7.0 days, for purpose of P-code re-initialization.