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:
Apr. 26, 2011
Filed:
Jul. 07, 2009
David Bartlett, Cambridgeshire, GB;
David Bartlett, Cambridgeshire, GB;
Omnisense, Ltd., Cambridge, GB;
Abstract
A tag transmits signals having at least two different frequency components. The signals are receivable by at least some of a plurality of spaced receivers. Each receiver, in response to receiving a signal, measures respective phases of the first and second frequency components and a frequency offset between the tag and the receiver. The frequency offset is dependent upon a difference in frequencies of respective clocks in the tag and the receiver. A position processor obtains a difference in phases of the first and second frequency components for a signal, a frequency offset between the receiver and tag and determines the position of the tag in dependence upon the difference between respective phases of the first and second frequency components and in dependence upon the frequency offset.