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. 14, 2014
Filed:
Jan. 22, 2013
David W. A. Taylor, Jr., Greensboro, NC (US);
Bradley David Farnsworth, Alexandria, VA (US);
William Todd Faulkner, Sylva, NC (US);
Christopher Matthew Foster, Fairfax, VA (US);
Robert Barlow Alwood, Springfield, VA (US);
David W. A. Taylor, Jr., Greensboro, NC (US);
Bradley David Farnsworth, Alexandria, VA (US);
William Todd Faulkner, Sylva, NC (US);
Christopher Matthew Foster, Fairfax, VA (US);
Robert Barlow Alwood, Springfield, VA (US);
Ensco, Inc., Falls Church, VA (US);
Abstract
A system and method for estimating the position of an object, such as a person, animal, or machine. The system includes first and second inertial measurement units, a first and second originator antennas, and a first and second transponder antennas. The system uses data from the inertial measurement units to estimate a position of the object. The system also calculates a range measurement between the first originator antenna and first transponder antenna. The system calculates a first CPD measurement between the second transponder antenna and the first originator antenna, and a second CPD measurement between the second originator antenna and the first transponder antenna. The range measurement and at least one CPD measurement are used to update a Kalman filter for estimating the position of the object. The system determines also updates the Kalman filter when one of the inertial measurement units is in a zero-velocity condition.