07580794 is referenced by 12 patents and cites 37 patents.

A GPS information service system for providing supplemental GPS correction and signal acquisition information to subscribers. A GPS information server broadcasts GPS aiding information encrypted with subscription keys. A remote GPS subscription unit receives the key enablers for the subscription keys in service activation (SAM) messages for the services for which they have subscribed and then uses the subscription keys to decrypt the GPS aiding information. In order to prevent unauthorized access to the information, unsymmetrical signature generation and authentication algorithms are used for generating and authenticating signatures for the SAM messages.

Title
Remote subscription unit for GNSS information
Application Number
11/474691
Publication Number
7580794 (B2)
Application Date
June 26, 2006
Publication Date
August 25, 2009
Inventor
Ann Ciganer
San Mateo
CA, US
David G Bird
Thornton
CO, US
James M Janky
Los Altos
CA, US
Assignee
Trimble Navigation
CA, US
IPC
G06F 19/00
G10K 15/02
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