Advanced science.  Applied technology.


Method for Delivering Secondary (Non-Location) Data to a GPS Receiver: 7,126,528


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.

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Jennifer L. Alvarez; Roger R. Chiodo; Thomas H. Jaeckle