Method and apparatus for an acquisition-aided Geo-locating subscriber unit
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United States of America Patent
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Mar 30, 1999
Grant Date -
N/A
app pub date -
Jul 31, 1996
filing date -
Jul 31, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
In a telecommunication system (15) with at least one gateway (1), at least one subscriber unit (2), a system controller (3), at least one communication satellite (4) and global positioning satellites (5), communication satellite (4) provides positioning information to subscriber units (2). System controller (3) uses links (13,14) with communication satellites (4) to control links (10,11) and links (8,9). Subscriber unit (2) receives on link (6) positioning information which is used by subscriber unit (2) to determine which global positioning satellites (5) are overhead. Knowing which global positioning satellites (5) are overhead allows subscriber unit (2) to more quickly acquire and track the global positioning satellites (5) required to accurately geo-locate itself. Subscriber unit (2) computes accurate location data and can transmit this data to gateway (1).
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