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. 22, 2008
Filed:
May. 16, 2002
Thomas H. Jaeckle, San Antonio, TX (US);
Richard L. Johnson, San Antonio, TX (US);
Michael A. Koets, San Antonio, TX (US);
M. Lavarre Bushman, San Antonio, TX (US);
Thomas H. Jaeckle, San Antonio, TX (US);
Richard L. Johnson, San Antonio, TX (US);
Michael A. Koets, San Antonio, TX (US);
M. LaVarre Bushman, San Antonio, TX (US);
Southwest Research Institute, San Antonio, TX (US);
Abstract
A self locating device that uses GSM signals associated with GSM digital telephone base stations to determine its current location. The device uses GSM common channel signals to determine observed time differences between a local base station and at least two additional base stations. It also uses the common channel signals to identify these base stations and to match the identifications to geographical locations. It further uses a geolocation algorithm to determine the location of the device relative to the base stations, and uses the geographic location data to determine the current geographic location of the device.