Method of and apparatus for measuring distance to an obstacle ut

Details Method of and apparatus for measuring distance to an obstacle ut Method of and apparatus for measuring distance to an obstacle ut

1994-06-29

1996-06-11

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367 98, G01S 1508

Patent

active

055263216

ABSTRACT:
The present invention relates to a method and apparatus for measuring distance to an obstacle which can be equipped to a self-propelled robot, and more particularly to a method and apparatus for measuring distinct to an obstacle which can improve distance resolution not by relying on an analog-to-digital conversion time but by relying on a system clock (main clock). The invention can distinguish noise by varying a reference voltage in order to discriminate whether the same is the signal reflected from the obstacle and received thereform, and can distinguish an accurate measurement by mutual comparison after measuring the distance by way of the two methods to thereby detect accurately the distance to the obstacle.

REFERENCES:
patent: 4315325 (1982-02-01), Blades
patent: 4887246 (1989-12-01), Hossack et al.

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