| 摘要 |
In a wireless emergency location system (30) in which a cellular phone (10) is utilized to communicate the location of an individual or vehicle by announcing position based on the output of a GPS receiver (16), time since the last fix is computed and annunciated to permit emergency personnel to ascertain if the position information is valid. In 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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