Doppler-effect vehicle ground-speed detecting apparatus having means for detecting vehicle body inclination
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United States of America Patent
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-
Sep 7, 1993
Grant Date -
N/A
app pub date -
Jul 30, 1992
filing date -
Aug 5, 1991
priority date (Note) -
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Abstract
A Doppler-effect vehicle ground-speed detecting apparatus having a transmitter fixed to a vehicle body and transmitting a wave toward a road surface on which the vehicle is running, a receiver fixed to the body and receiving a portion of the wave reflected by the road surface, and a ground-speed determining device for determining a ground-speed of the vehicle relative to the road surface, on the basis of a transmitting frequency of the wave as transmitted by the transmitter and a receiving frequency of the wave as received by the receiver. The ground-speed determining device determines the ground-speed of the vehicle, on the basis of a parameter which changes with an angle of the vehicle body relative to the road surface in a plane parallel to a running direction of the vehicle and perpendicular to the road surface, as well as on the basis of a difference between the transmitting and receiving frequencies.
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