Method and apparatus for measuring distance

Details Method and apparatus for measuring distance Method and apparatus for measuring distance

1996-12-27

1998-09-08

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367 98, G01S 1500

Patent

active

058055274

ABSTRACT:
A distance measuring apparatus includes a wave transmitting device for emitting a transmission wave. A wave receiving device is operative for receiving a reflection wave, which results from reflection of the transmission wave by a reflection object, as a reception wave. A time difference measuring device is operative for measuring a time difference between a moment at which the wave transmitting device emits the transmission wave and a moment at which the wave receiving device receives the reception wave. A distance calculating device is operative for calculating a distance to the reflection object on the basis of the time difference calculated by the time difference measuring device. An error correcting device is operative for detecting a time interval during which a signal level of the reception wave remains higher than a predetermined threshold level, and for correcting an error in the calculated distance to the reflection object on the basis of the detected time interval, the error being caused by a difference in intensity of the reception wave.

REFERENCES:
patent: 4905207 (1990-02-01), Fellinger et al.
patent: 5574463 (1996-11-01), Shirai et al.
patent: 5631639 (1997-05-01), Hibino et al.

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