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. 24, 2006
Filed:
Feb. 27, 2004
Jennifer L. Alvarez, San Antonio, TX (US);
Roger R. Chiodo, San Antonio, TX (US);
Thomas H. Jaeckle, San Antonio, TX (US);
Jennifer L. Alvarez, San Antonio, TX (US);
Roger R. Chiodo, San Antonio, TX (US);
Thomas H. Jaeckle, San Antonio, TX (US);
Southwest Research Institute, San Antonio, TX (US);
Abstract
A method of using a GPS receiver to receive secondary data. A conventional GPS receiver is modified to receive such data, without modifying its hardware. The secondary data is carried in a signal that has the same characteristics as a conventional GPS navigation signal, but is delivered at a specified frequency and time and with a specified and 'unused' spreading code. The secondary data is contained in a data subframe that is sufficiently similar to subframes that carry GPS navigation data, such that it can be demodulated and accessed by the GPS receiver.