Distance detection method and system

USRE46930E1 · kind E1 · reissue

Assignee

• LeddarTech Inc. · CA

Inventor

• Yvan Mimeault · Keyano, CA

Key dates

• Filing date: Dec 30, 2015
• Grant date: Jul 3, 2018
• Expiry date: Dec 30, 2035

Classification

• Technology area (CPC —): General

Abstract

There is provided a system and method for detecting a distance to an object. The method comprises providing a lighting system having at least one pulse width modulated visible-light source for illumination of a field of view; emitting an illumination signal for illuminating the field of view for a duration of time y using the visible-light source at a time t; integrating a reflection energy for a first time period from a time t−x to a time t+x; determining a first integration value for the first time period; integrating the reflection energy for a second time period from a time t+y−x to a time t+y+x; determining a second integration value for the second time period; calculating a difference value between the first integration value and the second integration value; determining a propagation delay value proportional to the difference value; determining the distance to the object from the propagation delay value.