Doppler-effect vehicle ground-speed detecting apparatus having m

Details Doppler-effect vehicle ground-speed detecting apparatus having m Doppler-effect vehicle ground-speed detecting apparatus having m

1992-07-30

1993-09-07

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Speed determination

367 96, 342104, 342 71, G01S 1560, G01S 1360

Patent

active

052435644

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.

REFERENCES:
patent: 4414548 (1983-11-01), Carpenter et al.

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