Patent ID: 6941109

Claim:
A network-assisted navigation satellite receiver system, comprising: a network server with an initialized first navigation satellite receiver for discerning accurate, absolute satellite system time; a network client remote from the network server and associated with an uninitialized second navigation satellite receiver that does not yet know said satellite system time; an interconnecting network between the network server and the network client, and that imposes a non-deterministic time delay on messages, and for communicating a network-transmission delay-corrected estimate of said satellite system time from the network server to the network client; a message latency testing means for determining the fastest transit times of messages from the network server to the network client (L 1 ), and for determining the fastest transit times of return messages from the network client to the network server (L 2 ); and an offset calculator for computing the average of the fastest transit times L 1 and L 2 and from that said network-transmission delay-corrected estimate of said satellite system time for the network client; wherein, said network-transmission delay-corrected estimate of said satellite system time is provided for use by said second navigation satellite receiver to quicken its initialization.