Laser radar for a vehicle lateral guidance system
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United States of America Patent
Stats
-
Apr 13, 1993
Grant Date -
N/A
app pub date -
Oct 3, 1990
filing date -
Oct 3, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A laser radar apparatus for producing a pulse modulated transmitted light beam and receiving reflected light beams from road mounted retroreflectors. In the preferred embodiment, a floodlight beam illuminates a portion of a roadway from 20 to 150 in front of a vehicle. Reflected beams from retroreflectors mounted in the roadway are received by the radar unit which calculates distance D and angle .theta. between the laser radar apparatus and each retroreflector. Distance D is calculated by measuring the propagation delay of the pulse modulated light beam. Angle .theta. data is indicated by measuring where on a receiver photodiode array the light beam is incident.
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