Communications – electrical: acoustic wave systems and devices – Echo systems – Speed determination
Patent
1991-09-06
1992-09-15
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Echo systems
Speed determination
G01S 1500
Patent
active
051484099
ABSTRACT:
An ultrasonic ground speedometer utilizing Doppler effect comprises an ultrasonic transmitter for outputting an ultrasonic wave 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 a road surface, an arithmetic circuit for deriving ground speed from Doppler shift between the output ultrasonic wave and the reflected ultrasonic wave. The ultrasonic ground speedometer also includes an output frequency control circuit for controlling the output ultrasonic wave frequency in such a manner as to keep the reflected ultrasonic wave frequency to a constant value in response to changes in ground speed. An amplification degree control circuit is also included for controlling the amplitude of the output ultrasonic wave to keep a substantially constant output intensity of the output ultrasonic wave over an output ultrasonic wave frequency range controlled by the output frequency control circuit.
REFERENCES:
patent: 3202960 (1965-08-01), Galbraith
patent: 4728954 (1988-03-01), Phelan et al.
patent: 4755975 (1988-07-01), Ito et al.
Kimura Toshiya
Kobayashi Hiroshi
Negishi Masami
Nissan Motor Company Ltd.
Pihulic Daniel T.
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