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:
Mar. 02, 2004
Filed:
Jun. 01, 2001
Applicant:
Inventors:
Alan M. Gilkes, Plano, TX (US);
Carl M. Panasik, Garland, TX (US);
Assignee:
Texas Instruments Incorporated, Dallas, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01S 1/24 ;
U.S. Cl.
CPC ...
G01S 1/24 ;
Abstract
The phase difference between a known stable reference signal ( ) and a known signal output by a wireless mobile communication device ( B) is determined at several known locations ( B- B). The location of the wireless mobile communication device is then determined from the phase difference information. Also, the approximate location of a wireless mobile communication device ( A) can be estimated by transmitting a message from the device at a predetermined power level ( ), and determining where among a plurality of predetermined locations ( A- A) the transmitted message has been received.