Doppler-effect vehicle speed sensor using different speed determ

Details Doppler-effect vehicle speed sensor using different speed determ Doppler-effect vehicle speed sensor using different speed determ

1993-10-18

1995-06-27

Hellner, Mark

Communications: directive radio wave systems and devices (e.g.,

Return signal controls external device

Radar mounted on and controls land vehicle

367 90, G01S 1360

Patent

active

054283590

ABSTRACT:
A Doppler-effect speed detecting apparatus for detecting a ground speed of a motor vehicle, including a transmitter, a receiver for receiving a portion of a wave transmitted by the transmitter and reflected by a road surface, a circuit for detecting an output level of the receiver, and a ground-speed determining device for determining the vehicle ground speed, on the basis of the frequencies of the transmitted and received waves, according to a predetermined first rule when the output level of said receiver is higher than a predetermined threshold value, and according to a predetermined second rule different from the first rule when the output level is not higher than the threshold value.

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patent: 5287329 (1994-02-01), Ikeda

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