Collision warning system
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United States of America Patent
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-
Oct 12, 1993
Grant Date -
N/A
app pub date -
Jul 16, 1992
filing date -
Jul 27, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A collision warning signal for at least one vehicle is provided by transmitting from the surface of the earth a radio signal, receiving at the surface of the earth, a radio signal returned by a vehicle in response to the transmitted radio signal, determining an elapsed time between the transmitting of the radio signal and the receiving of the corresponding returned radio signal, determining the position of the vehicle at least in part in dependence upon the determined elapsed time, comparing the determined position of the vehicle with terrain data stored in a data base, and generating a warning signal based on the comparison if predetermined parameters are satisfied.
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