Data processing: vehicles – navigation – and relative location – Navigation – Employing position determining equipment
Reexamination Certificate
2006-08-08
2006-08-08
Nguyen, Tan (Department: 3661)
Data processing: vehicles, navigation, and relative location
Navigation
Employing position determining equipment
C701S214000, C701S215000, C342S357490, C342S357490
Reexamination Certificate
active
07089113
ABSTRACT:
A GPS information service system for providing supplemental GPS location correction and signal acquisition information to subscribers. A GPS information server broadcasts GPS information encrypted with subscription keys. Remote GPS subscription unit receive the key enablers for the subscription keys in service activation (SAM) messages for the services for which they have subscribed and then use the subscription keys to decrypt the GPS information. In order to prevent unauthorized use, the SAM messages have signatures derived from identifications of the remote GPS subscription units using an unsymmetrical signature algorithm.
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Bird David G.
Ciganer Ann
Janky James M.
Gildea David R.
Menlo Patent Agency LLC
Nguyen Tan
Trimble Navigation Limited
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