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:
Sep. 07, 2007
Peter James Duffett-smith, Cambridge, GB;
Anthony Richard Pratt, Northampton, GB;
Peter James Duffett-Smith, Cambridge, GB;
Anthony Richard Pratt, Northampton, GB;
Cambridge Positioning Systems Limited, Cambridge, GB;
Abstract
A navigation system is described which includes a mobile terminalwhich has a transmission source receiverfor receiving the signals from one or more unsynchronised terrestrial transmission sources-and a satellite positioning receiverfor receiving signals from the satellite or satellites-of a satellite positioning system. The terminal also has a clock. A processoris arranged to acquire a measurement vector having a list of values, each value representing a measurement made by a receiver, and the terminal clock's bias. It computes a state vector representing the current state of the system, using a previously-determined state vector, the measurement vector, and a dynamic model in order to derive a dynamic navigation solution. The elements of the state vector include (a) in one or more dimensions at least position information of the terminal; (b) representations of the bias of the clocks associated with the unsynchronised terrestrial transmission sources-relative to a given time; (c) the bias of the terminal clock; (d) quality indicators indicating the error associated with elements of (a) to (c); and (e) linking indicators indicating the dependency of elements in (a) to (c) on others of those elements.