Doppler-effect vehicle ground speed detecting apparatus with mea

Details Doppler-effect vehicle ground speed detecting apparatus with mea Doppler-effect vehicle ground speed detecting apparatus with mea

1993-04-19

1994-02-15

Hellner, Mark

Communications, electrical: acoustic wave systems and devices

Echo systems

Speed determination

342 70, G01S 1300

Patent

active

052873293

ABSTRACT:
An apparatus for detecting a vehicle ground speed, including a transmitter for transmitting a wave towards a ground surface, and a receiver for receiving a portion of the transmitted wave reflected by the ground surface. The apparatus produces an output indicative of the vehicle ground speed, according to a Doppler effect on the basis of the frequencies of the transmitted wave and the reflected wave, and further includes a device for changing the frequency of the transmitted wave so that the sensitivity of the receiver is held within a predetermined optimum range. The device is adapted to restrict or inhibit a change in the frequency of the transmitted wave due to deterioration of the condition of the ground surface which causes the receiver sensitivity to be lowered.

REFERENCES:
patent: 4008473 (1977-02-01), Hinachi et al.
patent: 5061932 (1991-10-01), Tribe et al.
patent: 5097453 (1992-03-01), Kobayashi et al.
patent: 5148409 (1992-09-01), Kobayashi et al.

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