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Background ephemeris download in navigational receivers

  • US 7,436,357 B2
  • Filed: 11/20/2006
  • Issued: 10/14/2008
  • Est. Priority Date: 11/20/2006
  • Status: Active Grant
First Claim
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1. A method of maintaining current ephemeris in a navigation receiver, comprising:

  • alternating between a sleep mode and a wake up mode;

    testing a received signal strength when the receiver wakes up from the sleep mode;

    if the tested signal strength is sufficient to download ephemeris, downloading current ephemeris if a last downloaded ephemeris is no longer current; and

    if the tested signal strength is too weak to download ephemeris, placing the receiver back in sleep mode.

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