Background ephemeris download in navigational receivers

Details Background ephemeris download in navigational receivers Background ephemeris download in navigational receivers

2006-11-20

2008-10-14

Phan, Dao L (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

C342S357490, C342S357490

Reexamination Certificate

active

07436357

ABSTRACT:
The present invention provides methods and systems for keeping the ephemeris in a navigational receiver current to achieve fast TTFF without the need for connecting to an aiding network or remote server. In an embodiment, the receiver keeps the ephemeris current by downloading the ephemeris in the background. In the preferred embodiment, the receiver uses a background sleep/wake up process to download current ephemeris with minimal power drain. In this embodiment, the receiver alternates between a sleep mode and a wake up mode. During the wake up mode, the receiver attempts to download current ephemeris. The receiver then goes back to the sleep mode until the next wake up to conserve power. The receiver may wake up from the sleep mode to download the ephemeris when the stored ephemeris is no longer current or the ephemeris broadcasted from a satellite has been updated or based on receiver usage patterns.

REFERENCES:
patent: 6225945 (2001-05-01), Loomis
patent: 6429809 (2002-08-01), Vayanos
patent: 6559793 (2003-05-01), Eschenbach
patent: 6570530 (2003-05-01), Gaal
patent: 6707420 (2004-03-01), Vayanos
patent: 6727848 (2004-04-01), Eschenbach
patent: 6930635 (2005-08-01), Vayanos
patent: 2006/0068853 (2006-03-01), Dejanovic et al.
patent: 2007/0152878 (2007-07-01), Wang et al.
patent: 2007/0159391 (2007-07-01), Kuo et al.

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