Ground speed sensor

Details Ground speed sensor Ground speed sensor

G - Physics

01

S

349/34

G01S 15/60 (2006.01) G01S 13/60 (2006.01)

Patent

CA 1247228

GROUND SPEED SENSOR Abstract of the Disclosure An ultrasonic ground speed sensor has a vehicle-mounted transmitter and a receiver for receiving signals reflected from the transmitter to the receiver by terrain over which the vehicle travels. An attenuated and phase-shifted transmit frequency is superimposed upon an output of the receiver to cancel cross talk, thus providing a substantially pure reflected frequency. A phase-locked loop converts the reflected frequency to a voltage which represents the direction and speed of the vehicle.

481407

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