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:
Jun. 05, 2007
Filed:
Nov. 14, 2001
David Bartlett, Harston, GB;
Michael Reynolds, Harston, GB;
Paul Smith, Harston, GB;
Nicolas Vasilopoulos, Harston, GB;
Peter Duffett-smith, Harston, GB;
David Bartlett, Harston, GB;
Michael Reynolds, Harston, GB;
Paul Smith, Harston, GB;
Nicolas Vasilopoulos, Harston, GB;
Peter Duffett-Smith, Harston, GB;
Sagentia Limited, Harston, Cambridge, GB;
Abstract
The present invention provides a tracking system in which a mobile tag having an unknown position, which tag is to be tracked in space over time, transmits a signal comprising a pair of tones at different frequencies. The transmitted signal is received at each of three receivers, each having a known location, where the phase of each of the tones within the signal is measured. The measured phases are passed to a processing unit which determines the position of the tag at the time of transmission of the signal on the basis of the difference between the measured phases of the two tones. The tracking system operates over a defined finite range to track the position of the mobile tag uniquely in space.