Telecommunications – Carrier wave repeater or relay system – Portable or mobile repeater
Reexamination Certificate
2005-09-06
2005-09-06
Trinh, Sonny (Department: 2687)
Telecommunications
Carrier wave repeater or relay system
Portable or mobile repeater
C455S013100, C455S009000, C342S357490, C342S357490
Reexamination Certificate
active
06941109
ABSTRACT:
A navigation-satellite receiver support data network comprises a server connected to the Internet to provide initialization information to clients for faster cold starts. The server includes a GPS receiver that provides for tracking of a constellation of navigation satellites. When a client is started cold, time and frequency are initially unknown to it. Test messages are sent back and forth over the Internet and a path delay time is computed from the average of the quickest transit times. This yields the offset time between the server's time system and the client's time system. The server sends current time information to the client, and the computed path delay is added. The client can then compute correct time from the server and path delay information, and thereby select much sooner which satellites are correct to search.
REFERENCES:
patent: 6131067 (2000-10-01), Girerd et al.
patent: 6185427 (2001-02-01), Krasner et al.
patent: 6437734 (2002-08-01), McBurney et al.
patent: 2002/0135511 (2002-09-01), Zhao et al.
patent: 2003/0031185 (2003-02-01), Kikuchi et al.
Matsushita Hiroshi
McBurney Paul W.
eRide, Inc.
Seiko Epson Corporation
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