Distance measuring apparatus and distance measuring method for a

Details Distance measuring apparatus and distance measuring method for a Distance measuring apparatus and distance measuring method for a

1995-10-13

1998-04-14

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 505, G01C 308

Patent

active

057399018

ABSTRACT:
A distance measuring apparatus for a vehicle including: an irradiating means for emitting and irradiating an electromagnetic wave; a receiving means for receiving a reflected wave produced when the electromagnetic wave is reflected by an obstacle and generating a receiving signal; a propagation delay time period measuring means provided with a comparison value set such that a value for a comparison reference is larger in a case in which a propagation delay time period from irradiating to receiving the electromagnetic wave is shorter than in a case in which the propagation delay time period thereof is longer for comparing the receiving signal with the comparison value, recognizing a time point at which the receiving signal is equal to or larger than the comparison value when the receiving signal is compared with the comparison value as a receive detecting time point and measuring the propagation delay time period from a time point at which the irradiating means irradiates the electromagnetic wave to the receive detecting time point; and a distance calculating means for calculating a distance between the obstacle and a driving vehicle based on the propagation delay time period.

REFERENCES:
patent: 3644740 (1972-02-01), Dobratz et al.
patent: 5179286 (1993-01-01), Akasu
patent: 5504570 (1996-04-01), Akasu
patent: 5523835 (1996-06-01), Tanaka
patent: 5574552 (1996-11-01), Donne

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