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:
Oct. 30, 2001
Filed:
Sep. 02, 1999
D. Alexander Stratton, Cedar Rapids, IA (US);
Daryl L. McCall, Springville, IA (US);
Daniel J. Thuringer, Cedar Rapids, IA (US);
Rockwell Collins, Cedar Rapids, IA (US);
Abstract
Satellite navigation systems and receivers of the invention include an antenna which receives satellite signals from multiple satellites. Radio frequency circuitry coupled to the antenna converts the satellite signals into intermediate signals. Multiple signal processors coupled to the radio frequency circuitry implement similar or identical signal processing algorithms on the received satellite signals to provide redundant ranging information (i.e., code and carrier measurements). One or more navigation processors coupled to the signal processors process the ranging information and provide positioning data outputs. The navigation processor implements smoothing filter functions that combine the redundant ranging data in a manner which enhances the positional accuracy. The navigation processor also implements unique fault-detection filter functions on the redundant ranging information. The characteristic response of the fault-detection filter functions are matched to the response of the smoothing filter functions, ensuring that signal-processing faults are detected and before the smoothed data exhibits excessive errors.