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

1993-03-29

1994-12-06

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Echo systems

Speed determination

342 70, 342104, G01S 1560, G01S 1360

Patent

active

053717180

ABSTRACT:
A Doppler-effect speed detecting apparatus for detecting a ground speed of a vehicle, including a transmitter for transmitting a wave towards the ground surface, a receiver for receiving the wave reflected by the ground surface, and an output device for producing an output indicative of the ground speed according to the frequencies of the transmitted and reflected waves. The apparatus further includes a device for determining presence or absence of abnormality relating to the output of the output device, on the basis of an output level of the receiver as well as a speed difference between the ground speed obtained by the output device and an estimated vehicle speed which is obtained on the basis of rotating speeds of the vehicle wheels.

REFERENCES:
patent: 4346774 (1982-08-01), Hirota et al.
patent: 4366546 (1982-12-01), Tachibana et al.
patent: 4893287 (1990-01-01), Stratton et al.
patent: 4942558 (1990-07-01), Hiniker et al.
patent: 4969100 (1990-11-01), Takata et al.
patent: 5016017 (1991-05-01), Kodera et al.

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