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:
Aug. 28, 2012
Filed:
Nov. 22, 2010
Peter James Duffett-smith, Cambridge, GB;
Anthony Richard Pratt, Cambridge, GB;
David William Bartlett, Cambridge, GB;
Peter James Duffett-Smith, Cambridge, GB;
Anthony Richard Pratt, Cambridge, GB;
David William Bartlett, Cambridge, GB;
Cambridge Positioning Systems Limited, Cambridge, GB;
Abstract
A method of and system for calibrating un-calibrated time information within a mobile terminalis disclosed. The terminal has a receivercapable of receiving signals from which calibrated time information carried by a calibrated system (a satellite positioning system) can be extracted, and a receivercapable of receiving signals from which un-calibrated time information carried by an un-calibrated stable system (a cellular communications system) may be extracted. The time offset between calibrated time information extracted from the calibrated system and un-calibrated time information extracted from the un-calibrated stable system is determined at a first terminal position where the signals from the un-calibrated stable system are available, the travel times of the signals from the un-calibrated stable system are known or determined, and the signals from the calibrated system are available. The un-calibrated time information extracted from signals of the un-calibrated stable system received at a second terminal position, is calibrated from known or determined travel times of the signals from the un-calibrated stable system at the second terminal position and the time offset which has been determined.