Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Reexamination Certificate
2006-10-24
2006-10-24
Phan, Dao (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
Reexamination Certificate
active
07126528
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.
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Alvarez Jennifer L.
Chiodo Roger R.
Jaeckle Thomas H.
Baker & Botts L.L.P.
Phan Dao
Southwest Research Institute
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