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. 09, 2003
Filed:
Apr. 30, 2002
Thomas M. King, Tempe, AZ (US);
George J. Geier, Scottsdale, AZ (US);
Sayfe Kiaei, Scottsdale, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A method ( ) for correcting oscillator frequency error in GPS signal acquisition includes a first step ( ) of receiving at least one broadcasted GPS signal. A next step ( ) includes estimating a plurality of Doppler offsets. A next step ( ) includes correlating the signal to produce a Doppler modulation for each of the plurality of Doppler estimates. A next step ( ) includes calculating a magnitude separation of peak and null states of each modulation. A next step ( ) includes searching the peak and null separation to finding the Doppler estimate producing the largest magnitude separation in peak and null states. The found Doppler estimate defines a frequency error estimate for the at least one broadcasted GPS signal, which will be common across all satellites.