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. 16, 1999
Filed:
Nov. 17, 1997
Thomas V DeWulf, Cedar Rapids, IA (US);
Rockwell International, Costa Mesa, CA (US);
Abstract
Provided are a method of and a circuit for processing GPS signals in the L1 frequency band centered around frequency f.sub.L1 and GPS signals in the L2 frequency band centered around frequency f.sub.L2. The L1 frequency band signals are combined with the L2 frequency band signals to obtain a combined signal having both an L1 frequency band component and an L2 frequency band component. The combined signal is frequency converted by mixing it with a local oscillator signal centered around a frequency f.sub.L0 to obtain a frequency converted combined signal centered around a third center frequency f.sub.C3. The frequency converted combined signal is filtered to provide an output signal having substantially all of its components centered around the third center frequency f.sub.C3. The frequency f.sub.L0 of the local oscillator signal is selectively controlled to thereby control whether the output signal contains frequency components corresponding to only the L1 frequency band signal, to only the L2 frequency band signal, or to both of the L1 and L2 frequency band signals.