Time since last fix annunciation system for GPS-based wireless rescue system
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United States of America Patent
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Apr 7, 1998
Grant Date -
N/A
app pub date -
Feb 28, 1996
filing date -
Feb 28, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a wireless emergency location system in which a cellular phone is utilized to communicate the location of an individual or vehicle by announcing position based on the output of a GPS receiver, time since last fix is computed and annunciated to permit emergency personnel to ascertain if the position information is valid. In a one embodiment, velocity and direction of travel are also annunciated for permitting emergency personnel to calculate the location of the phone and thus a stricken individual. Time since last fix as well as velocity and direction annunciation is also used to enable location of stolen or hijacked vehicles assuming location information is no longer available at the phone or satellite fix has been lost.
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