Method and apparatus for enhanced autonomous GPS
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United States of America Patent
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Sep 29, 2009
Grant Date -
Sep 29, 2005
app pub date -
Feb 11, 2005
filing date -
Oct 2, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Method and apparatus for locating position of a remote receiver is described. In one example, long term satellite tracking data is obtained at a remote receiver. Satellite positioning system (SPS) satellites are detected. Pseudoranges are determined from the remote receiver to the detected SPS satellites. Position of the remote receiver is computed using the pseudoranges and the long term satellite tracking data. SPS satellites may be detected using at least one of acquisition assistance data computed using a previously computed position and a blind search. Use of long term satellite tracking data obviates the need for the remote receiver to decode ephemeris from the satellites. In addition, position of the remote receiver is computed without obtaining an initial position estimate from a server or network.
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