Method and apparatus for enhanced autonomous GPS
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United States of America Patent
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Feb 4, 2014
Grant Date -
Sep 13, 2012
app pub date -
Mar 12, 2012
filing date -
Oct 2, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method and apparatus for determining a location of a remote receiver is described. The remote receiver receives satellite tracking data from a server, which it stores in memory. This satellite tracking data has a predetermined validity time period associated with it. When a connection cannot be established between the remote receiver and the server and the predetermine validity time period of the satellite tracking data has expired, the remote receiver calculates acquisition assistance data using the expired satellite tracking data for use with obtaining ephemeris data from a satellite. The remote receiver then calculates its position using the receiver ephemeris data.
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