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AssigneeSouthwest Research Institute
InventorsJennifer L. Alvarez, Roger R. Chiodo, Thomas H. Jaeckle
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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.
A method of communicating secondary data to a GPS receiver having only GPS hardware, comprising the steps of:
A improved GPS receiver for receiving secondary data, using only GPS hardware including a GPS processing unit, the improvement comprising:
A method of modifying a GPS receiver having a processing unit so that the GPS receiver may receive secondary message data, comprising the steps of:
Dependencies are inferred from the claim text.