Patent ID: 7580794
Filing Date: 2009-08-25
Classification: G01S,H04K,H04L

Abstract:
1. A global navigation satellite system (GNSS) subscription unit, comprising: receiver circuitry for receiving a GNSS aiding signal from a GNSS information server, said GNSS aiding signal having a plurality of items encrypted with a plurality of subscription keys; a subscription key generator for providing certain ones of said subscription keys corresponding to certain ones of said items for which the unit has subscriptions; a GNSS information decrypter for decrypting said certain items with said certain subscription keys; and a GNSS receiver for using said decrypted items for processing a GNSS satellite signal, wherein: said items in said GNSS aiding signal include at least one of GNSS correction information for improving accuracy of a GNSS position computed by the GNSS receiver, GNSS acquisition information for improving sensitivity in the GNSS receiver to said GNSS satellite signal or GNSS acquisition information for improving speed for acquiring said GNSS satellite signal in the GNSS receiver.