System and method for determining vehicle ground speed

Details System and method for determining vehicle ground speed System and method for determining vehicle ground speed

1977-09-12

1979-01-16

Krawczewicz, Stanley T.

Electricity: measuring and testing

Electrical speed measuring

Including 'event' sensing means

250222R, 180105E, 246187B, G01P 366

Patent

active

041351550

ABSTRACT:
A plurality of sensors are located on one of the bodies, staggered by fixed distances from each other along the direction of relative movement. The sensors are responsive to a characteristic of the other body, for example to surface characteristics of a roadway. A sensed signal, picked up by a first, or leading sensor is time delayed for a predetermined time interval, and compared with signals received from all the other sensors. Upon optimum correlation, and with known time delay and distance between sensors, the relative speed can then be indicated by determining which one of the sensors picked up the signals which matched the time delay signal. The amplitudes of the signals can be dynamically equalized and the time delay itself changed to permit output over wide ranges, or with respect to different scaling units.

REFERENCES:
patent: 3649818 (1972-03-01), Sylvander et al.
patent: 3885873 (1975-05-01), Andermo

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