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:
Jul. 15, 2014
Filed:
Apr. 27, 2011
Kelly Gravelle, Poway, CA (US);
Jeremy Landt, Santa Fe, NM (US);
Joseph H. Kao, Albuquerque, NM (US);
Michael P. Gonzales, Albuquerque, NM (US);
Kelly Gravelle, Poway, CA (US);
Jeremy Landt, Santa Fe, NM (US);
Joseph H. Kao, Albuquerque, NM (US);
Michael P. Gonzales, Albuquerque, NM (US);
Amtech Systems, LLC, Albuquerque, NM (US);
Abstract
A system for measuring the range to an RFID tag including situations containing high clutter and multi-path signals is disclosed. The system includes an RFID reader; an RFID tag; and a coordinated pulse radar system. In the system the RFID reader causes the tag to respond to received signals in a first backscatter state at a first time and a second backscatter state at a second time. The pulsed radar system transmits short pulses coordinated by the backscatter state of the RFID tag and the system creates a differential signal comprised of the differences between radar signals obtained during the first and second states of the tag to obtain an uncorrupted measure of a round trip time of flight of said radar pulses between the pulse radar system and the RFID tag.