Ultrasonic ground speedometer utilizing doppler effect

Details Ultrasonic ground speedometer utilizing doppler effect Ultrasonic ground speedometer utilizing doppler effect

1990-04-26

1991-10-01

Steinberger, Brian S.

Communications, electrical: acoustic wave systems and devices

Echo systems

Speed determination

367140, G01S 1500

Patent

active

050540033

ABSTRACT:
An ultrasonic ground speedometer utilizing Doppler effect comprises an ultrasonic transmitter for outputting an ultrasonic wave having a particular wavelength at a predetermined angle against a road surface, an ultrasonic receiver for receiving a reflected ultrasonic wave caused by reflection of the output ultrasonic wave from the road surface, and a signal processor for deriving ground speed from Doppler shift between the output ultrasonic wave and the reflected ultrasonic wave. The particular wavelength is set to a value within a range of 2.6 mm through 3.4 mm to assure the highest possible S/N ratio for the Doppler shift signal obtained from the signal processor.

REFERENCES:
patent: 2770795 (1956-11-01), Peterson
patent: 3898878 (1975-08-01), Stellworth et al.
patent: 4728954 (1988-03-01), Phelan et al.

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