Object sensing apparatus using predicting means for Determining

Details Object sensing apparatus using predicting means for Determining Object sensing apparatus using predicting means for Determining

1995-04-25

1997-06-03

O'Shea, Sandra L.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

G01R 2704

Patent

active

056358440

ABSTRACT:
An obstacle sensing apparatus uses an FM-CW wave as an emitted wave to an object in front of a car. A received wave from the object is mixed with the emitted wave to produce a beat signal which is analyzed in frequency to measure a distance and a relative speed with respect to the object. A distance and a relative speed at the next time is predicted from the measured distance and relative speed. The object is determined to be a car if the relative speed does not have an approaching direction or substantially the same value as a sensed car speed. The object is otherwise determined to be at least one of a guardrail and a sound barrier if a difference between the measured distance and the predicted distance exceeds a preset value and a plurality of the last measured distances are substantially constant. The object is otherwise determined to be a stationary object other than the guardrail.

REFERENCES:
patent: 3633204 (1972-01-01), Earp et al.
patent: 4079377 (1978-03-01), Heiden et al.
patent: 5220331 (1993-06-01), Gunter

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