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:
Mar. 03, 1998
Filed:
Feb. 01, 1996
Applicant:
Inventors:
Kreg A Martin, Cupertino, CA (US);
Gary R Lennen, Cupertino, CA (US);
Assignee:
Trimble Navigation Limited, Sunnyvale, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B / ; G01S / ;
U.S. Cl.
CPC ...
342357 ; 375200 ;
Abstract
A navigation satellite receiver for demodulating spread spectrum transmissions on pairs of L-band microwave carrier frequency channels, L1 and L2, which use the same pseudorandom number spreading code. A single P(Y)-code generator is used to produce independent P(Y)-code outputs for L1 and L2. The relative P(Y)-code phase between the outputs is adjusted by a phase resolver to account for the dissimilar delays the ionosphere imposes on each of L1 and L2. The phase resolver counts the excess of L1 code clocks over the L2 code clocks with a digital counter and adjusts a digital delay line to compensate.